Freeciv-3.1: /fast/freeciv/nightly/S3_1/common/requirements.c File Reference

Freeciv-3.1

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Data Structures | Macros | Typedefs | Functions | Variables
requirements.c File Reference
`#include <stdarg.h>`
`#include "astring.h"`
`#include "fcintl.h"`
`#include "log.h"`
`#include "support.h"`
`#include "achievements.h"`
`#include "calendar.h"`
`#include "citizens.h"`
`#include "culture.h"`
`#include "game.h"`
`#include "government.h"`
`#include "improvement.h"`
`#include "movement.h"`
`#include "player.h"`
`#include "map.h"`
`#include "research.h"`
`#include "road.h"`
`#include "server_settings.h"`
`#include "specialist.h"`
`#include "style.h"`
`#include "victory.h"`
`#include "requirements.h"`

Go to the source code of this file.

## Data Structures

struct | req_def

## Macros

#define | REQUC_LOCAL unchanging_local
#define | REQUC_PRESENT unchanging_present
#define | REQUC_WORLD unchanging_world
#define | REQUC_NALLY unchanging_noally
#define | REQUC_CITYTILE unchanging_citytile
#define | REQUC_CITYSTATUS unchanging_citystatus
#define | REQUC_IMPR unchanging_building
#define | IS_REQ_ACTIVE_VARIANT_ASSERT(_kind)

## Typedefs

typedef enum req_item_found(* | universal_found) (const struct requirement *, const struct universal *)
typedef enum fc_tristate(* | is_req_active_cb) (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)

## Functions

static enum fc_tristate | tri_req_present (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static bool | are_tiles_in_range (const struct tile *tile1, const struct tile *tile2, enum req_range range)
static enum req_unchanging_status | unchanging_local (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_present (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_world (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_noally (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_citytile (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_citystatus (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
static enum req_unchanging_status | unchanging_building (const struct civ_map *nmap, enum req_unchanging_status def, const struct req_context *context, const struct requirement *req)
struct universal | universal_by_rule_name (const char *kind, const char *value)
static bool | activity_is_valid_in_requirement (enum unit_activity act)
bool | universal_is_legal_in_requirement (const struct universal *univ)
void | universal_value_from_str (struct universal *source, const char *value)
struct universal | universal_by_number (const enum universals_n kind, const int value)
void | universal_copy (struct universal *dst, const struct universal *src)
void | universal_extraction (const struct universal *source, int *kind, int *value)
int | universal_number (const struct universal *source)
const struct req_context * | req_context_empty (void)
const char * | req_to_fstring (const struct requirement *req, struct astring *astr)
struct requirement | req_from_str (const char *type, const char *range, bool survives, bool present, bool quiet, const char *value)
struct requirement | req_from_values (int type, int range, bool survives, bool present, bool quiet, int value)
void | req_get_values (const struct requirement *req, int *type, int *range, bool *survives, bool *present, bool *quiet, int *value)
void | req_copy (struct requirement *dst, const struct requirement *src)
bool | are_requirements_equal (const struct requirement *req1, const struct requirement *req2)
static bool | are_requirements_opposites (const struct requirement *req1, const struct requirement *req2)
static bool | impr_contra_genus (const struct requirement *impr_req, const struct requirement *genus_req)
static bool | nation_contra_group (const struct requirement *nation_req, const struct requirement *group_req)
static bool | present_implies_not_present (const struct requirement *req1, const struct requirement *req2)
bool | req_implies_req (const struct requirement *req1, const struct requirement *req2)
bool | are_requirements_contradictions (const struct requirement *req1, const struct requirement *req2)
bool | does_req_contradicts_reqs (const struct requirement *req, const struct requirement_vector *vec)
static bool | players_in_same_range (const struct player *pplayer1, const struct player *pplayer2, enum req_range range)
static enum fc_tristate | is_none_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static int | num_world_buildings_total (const struct impr_type *building)
static int | num_world_buildings (const struct impr_type *building)
static bool | player_has_ever_built (const struct player *pplayer, const struct impr_type *building)
static int | num_player_buildings (const struct player *pplayer, const struct impr_type *building)
static int | num_continent_buildings (const struct player *pplayer, int continent, const struct impr_type *building)
static int | num_city_buildings (const struct city *pcity, const struct impr_type *building)
static enum fc_tristate | is_building_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_buildinggenus_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_tech_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_techflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minculture_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minforeignpct_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_maxunitsontile_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_extra_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_good_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_action_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_outputtype_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_specialist_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_terrain_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_terrainclass_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_terrainflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_roadflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_extraflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_terrainalter_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_gov_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_style_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_mintechs_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_ai_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_nation_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_nationgroup_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_nationality_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_diplrel_in_range (const struct player *target_player, const struct player *other_player, enum req_range range, int diplrel)
static enum fc_tristate | is_diplrel_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_diplrel_tile_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_diplrel_tile_o_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_diplrel_unitany_in_range (const struct tile *target_tile, const struct player *other_player, enum req_range range, int diplrel)
static enum fc_tristate | is_diplrel_unitany_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_diplrel_unitany_o_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_unittype_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_unitflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_unitclass_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_unitclassflag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_unitstate_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_activity_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minveteran_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minmovefrags_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minhitpoints_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_age_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static bool | is_city_in_tile (const struct tile *ptile, const struct city *pcity)
static enum fc_tristate | is_citytile_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_citystatus_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minsize_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_achievement_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_minyear_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_mincalfrag_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_topology_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
static enum fc_tristate | is_serversetting_req_active (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)
bool | is_req_active (const struct req_context *context, const struct player *other_player, const struct requirement *req, const enum req_problem_type prob_type)
enum fc_tristate | tri_req_active (const struct req_context *context, const struct player *other_player, const struct requirement *req)
bool | are_reqs_active (const struct req_context *context, const struct player *other_player, const struct requirement_vector *reqs, const enum req_problem_type prob_type)
enum fc_tristate | tri_req_active_turns (int pass, int period, const struct req_context *context, const struct player *other_player, const struct requirement *req)
enum fc_tristate | default_tester_cb (const struct req_context *context, const struct player *other_player, const struct requirement *req, void *data, int n_data)
enum fc_tristate | tri_reqs_cb_active (const struct req_context *context, const struct player *other_player, const struct requirement_vector *reqs, struct requirement_vector *maybe_reqs, req_tester_cb tester, void *data, int n_data)
enum req_unchanging_status | is_req_unchanging (const struct req_context *context, const struct requirement *req)
enum req_unchanging_status | is_req_preventing (const struct req_context *context, const struct player *other_player, const struct requirement *req, enum req_problem_type prob_type)
bool | is_req_in_vec (const struct requirement *req, const struct requirement_vector *vec)
bool | req_vec_wants_type (const struct requirement_vector *reqs, enum universals_n kind)
bool | universal_never_there (const struct universal *source)
bool | req_is_impossible_to_fulfill (const struct requirement *req)
bool | req_vec_is_impossible_to_fulfill (const struct requirement_vector *reqs)
req_vec_num_in_item | req_vec_vector_number (const void *parent_item, const struct requirement_vector *vec)
struct requirement_vector * | req_vec_by_number (const void *parent_item, req_vec_num_in_item number)
const char * | req_vec_change_translation (const struct req_vec_change *change, const requirement_vector_namer namer)
bool | req_vec_change_apply (const struct req_vec_change *modification, requirement_vector_by_number getter, const void *parent_item)
struct req_vec_problem * | req_vec_problem_new_transl (int num_suggested_solutions, const char *description, const char *description_translated)
struct req_vec_problem * | req_vec_problem_new (int num_suggested_solutions, const char *descr,...)
void | req_vec_problem_free (struct req_vec_problem *issue)
struct req_vec_problem * | req_vec_get_first_contradiction (const struct requirement_vector *vec, requirement_vector_number get_num, const void *parent_item)
struct req_vec_problem * | req_vec_suggest_repair (const struct requirement_vector *vec, requirement_vector_number get_num, const void *parent_item)
struct req_vec_problem * | req_vec_get_first_missing_univ (const struct requirement_vector *vec, requirement_vector_number get_num, const void *parent_item)
struct req_vec_problem * | req_vec_get_first_redundant_req (const struct requirement_vector *vec, requirement_vector_number get_num, const void *parent_item)
struct req_vec_problem * | req_vec_suggest_improvement (const struct requirement_vector *vec, requirement_vector_number get_num, const void *parent_item)
bool | are_universals_equal (const struct universal *psource1, const struct universal *psource2)
const char * | universal_rule_name (const struct universal *psource)
const char * | universal_name_translation (const struct universal *psource, char *buf, size_t bufsz)
const char * | universal_type_rule_name (const struct universal *psource)
int | universal_build_shield_cost (const struct city *pcity, const struct universal *target)
bool | universal_replace_in_req_vec (struct requirement_vector *reqs, const struct universal *to_replace, const struct universal *replacement)
bool | universal_is_mentioned_by_requirements (const struct requirement_vector *reqs, const struct universal *psource)
bool | universals_mean_unfulfilled (struct requirement_vector *reqs, struct universal *unis, size_t n_unis)
bool | universals_say_everything (struct requirement_vector *reqs, struct universal *unis, size_t n_unis)
enum req_item_found | universal_fulfills_requirement (const struct requirement *preq, const struct universal *source)
bool | universal_fulfills_requirements (bool check_necessary, const struct requirement_vector *reqs, const struct universal *source)
bool | universal_is_relevant_to_requirement (const struct requirement *req, const struct universal *source)
static enum req_item_found | nation_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | government_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | improvement_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | unit_class_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | unit_type_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | unit_activity_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | terrain_type_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | city_tile_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | extra_type_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | action_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | diplrel_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | output_type_found (const struct requirement *preq, const struct universal *source)
static enum req_item_found | ustate_found (const struct requirement *preq, const struct universal *source)
void | universal_found_functions_init (void)
int | requirement_kind_ereq (const int value, const enum req_range range, const bool present, const int max_value)

## Variables

static universal_found | universal_found_function [VUT_COUNT] = {NULL}
static struct req_def | req_definitions [VUT_COUNT]

## Macro Definition Documentation

## ◆ IS_REQ_ACTIVE_VARIANT_ASSERT

#define IS_REQ_ACTIVE_VARIANT_ASSERT | ( |  | _kind | ) |

Value:
{ \
fc_assert_ret_val(req != NULL, TRI_MAYBE); \
fc_assert_ret_val(req->source.kind == _kind, TRI_MAYBE); \
fc_assert(context != NULL); \
}
TRI_MAYBE
@ TRI_MAYBE
Definition shared.h:46

Definition at line 1618 of file requirements.c.

## ◆ REQUC_CITYSTATUS

#define REQUC_CITYSTATUS unchanging_citystatus

Definition at line 177 of file requirements.c.

## ◆ REQUC_CITYTILE

#define REQUC_CITYTILE unchanging_citytile

Definition at line 160 of file requirements.c.

## ◆ REQUC_IMPR

#define REQUC_IMPR unchanging_building

Definition at line 216 of file requirements.c.

## ◆ REQUC_LOCAL

#define REQUC_LOCAL unchanging_local

Definition at line 82 of file requirements.c.

## ◆ REQUC_NALLY

#define REQUC_NALLY unchanging_noally

Definition at line 137 of file requirements.c.

## ◆ REQUC_PRESENT

#define REQUC_PRESENT unchanging_present

Definition at line 98 of file requirements.c.

## ◆ REQUC_WORLD

#define REQUC_WORLD unchanging_world

Definition at line 113 of file requirements.c.

## Typedef Documentation

## ◆ is_req_active_cb

typedef enum fc_tristate(* is_req_active_cb) (const struct civ_map *nmap, const struct req_context *context, const struct player *other_player, const struct requirement *req)

Definition at line 53 of file requirements.c.

## ◆ universal_found

typedef enum req_item_found(* universal_found) (const struct requirement *, const struct universal *)

Definition at line 1 of file requirements.c.

## Function Documentation

## ◆ action_found()

static enum req_item_found action_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if an action fulfills a requirement

Definition at line 6241 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ activity_is_valid_in_requirement()

static bool activity_is_valid_in_requirement | ( | enum unit_activity | act | ) |

static

Returns TRUE iff the specified activity can appear in an "Activity" requirement.

Definition at line 250 of file requirements.c.

Referenced by universal_is_legal_in_requirement(), and universal_value_from_str().

## ◆ are_reqs_active()

bool are_reqs_active | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement_vector * | reqs,
|  | const enum req_problem_type | prob_type
| ) |  |

Checks the requirement(s) to see if they are active on the given target.

context gives the target (or targets) to evaluate against

reqs gives the requirement vector. The function returns TRUE only if all requirements are active.

context may be NULL. This is equivalent to passing an empty context.

Make sure you give all aspects of the target when calling this function: for instance if you have TARGET_CITY pass the city's owner as the target player as well as the city itself as the target city.

Definition at line 4361 of file requirements.c.

Referenced by action_auto_perf_unit_sel(), add_clause(), are_road_reqs_fulfilled(), can_build_base(), can_build_extra(), can_change_to_government(), can_city_build_improvement_direct(), can_city_build_unit_direct(), can_disaster_happen(), can_extra_appear(), can_extra_disappear(), can_remove_extra(), can_unit_do_connect(), city_can_use_specialist(), city_style(), get_target_bonus_effects(), get_tile_infrastructure_set(), get_tile_value(), goods_can_be_provided(), handle_diplomacy_accept_treaty_req(), is_enabler_active(), is_native_tile_to_extra(), is_native_tile_to_road(), is_target_possible(), multiplier_can_be_changed(), player_can_build_base(), player_can_build_extra(), player_can_remove_extra(), player_music_style(), sg_special_set(), unit_can_displace_hut(), unit_can_enter_hut(), and unit_enter_hut().

## ◆ are_requirements_contradictions()

bool are_requirements_contradictions | ( | const struct requirement * | req1,
|  | const struct requirement * | req2
| ) |  |

Returns TRUE if req1 and req2 contradicts each other.

TODO: If information about what entity each requirement type will be evaluated against is passed it will become possible to detect stuff like that an unclaimed tile contradicts all DiplRel requirements against it.

Definition at line 1438 of file requirements.c.

Referenced by default_tester_cb(), does_req_contradicts_reqs(), req_implies_req(), req_vec_first_contradiction_in_vec(), and req_vec_get_first_contradiction().

## ◆ are_requirements_equal()

bool are_requirements_equal | ( | const struct requirement * | req1,
|  | const struct requirement * | req2
| ) |  |

Returns TRUE if req1 and req2 are equal. Does not care if one is quiet and the other not.

Definition at line 1296 of file requirements.c.

Referenced by req_edit::incoming_req_vec_change(), is_req_in_vec(), purge_duplicate_req_vec(), req_vec_change_apply(), req_vec_get_first_redundant_req(), send_packet_ruleset_action_auto_100(), send_packet_ruleset_action_enabler_100(), send_packet_ruleset_building_100(), send_packet_ruleset_city_100(), send_packet_ruleset_clause_100(), send_packet_ruleset_disaster_100(), send_packet_ruleset_effect_100(), send_packet_ruleset_extra_100(), send_packet_ruleset_goods_100(), send_packet_ruleset_government_100(), send_packet_ruleset_multiplier_100(), send_packet_ruleset_music_100(), send_packet_ruleset_road_100(), send_packet_ruleset_specialist_100(), send_packet_ruleset_tech_100(), and send_packet_ruleset_unit_100().

## ◆ are_requirements_opposites()

static bool are_requirements_opposites | ( | const struct requirement * | req1,
|  | const struct requirement * | req2
| ) |  |

static

Returns TRUE if req1 and req2 directly negate each other.

Definition at line 1308 of file requirements.c.

Referenced by are_requirements_contradictions().

## ◆ are_tiles_in_range()

static bool are_tiles_in_range | ( | const struct tile * | tile1,
|  | const struct tile * | tile2,
|  | enum req_range | range
| ) |  |

inlinestatic

Returns TRUE if tiles are in given requirements range with each other

Definition at line 1558 of file requirements.c.

Referenced by unchanging_citytile().

## ◆ are_universals_equal()

bool are_universals_equal | ( | const struct universal * | psource1,
|  | const struct universal * | psource2
| ) |  |

Return TRUE iff the two sources are equivalent. Note this isn't the same as an == or memcmp check.

Definition at line 5278 of file requirements.c.

Referenced by add_target_to_production(), add_target_to_worklist(), are_requirements_equal(), are_requirements_opposites(), are_worklists_equal(), change_build_target(), city_building_impr_or_unit(), city_dialog_update_building(), city_set_queue(), city_worklist_commit(), client_change_all(), clipboard_send_production_packet(), handle_city_change(), handle_city_info(), insert_allows_single(), ok_worklist_editor_callback(), and ruledit_gui::open_effect_edit().

## ◆ city_tile_found()

static enum req_item_found city_tile_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a tile state fulfills a requirement

Definition at line 6193 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ default_tester_cb()

enum fc_tristate default_tester_cb | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req,
|  | void * | data,
|  | int | n_data
| ) |  |

A tester callback for tri_reqs_cb_active() that uses the default requirement calculation except for requirements in data[n_data] array and ones implied by them or contradicting them

Definition at line 4495 of file requirements.c.

## ◆ diplrel_found()

static enum req_item_found diplrel_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a diplrel fulfills a requirement

Definition at line 6257 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ does_req_contradicts_reqs()

bool does_req_contradicts_reqs | ( | const struct requirement * | req,
|  | const struct requirement_vector * | vec
| ) |  |

Returns TRUE if the given requirement contradicts the given requirement vector.

Definition at line 1539 of file requirements.c.

Referenced by ae_suggest_repair_if_no_oblig(), city_production_caravan_shields_init(), local_dipl_rel_action_cache_set(), local_dipl_rel_tile_other_tgt_action_cache_set(), and utype_may_act_tgt_city_tile().

## ◆ extra_type_found()

static enum req_item_found extra_type_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if an extra type fulfills a requirement

Definition at line 6214 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ government_found()

static enum req_item_found government_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a government fulfills a requirement

Definition at line 6049 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ impr_contra_genus()

static bool impr_contra_genus | ( | const struct requirement * | impr_req,
|  | const struct requirement * | genus_req
| ) |  |

static

Returns TRUE if the specified building requirement contradicts the specified building genus requirement.

Definition at line 1321 of file requirements.c.

Referenced by are_requirements_contradictions().

## ◆ improvement_found()

static enum req_item_found improvement_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if an improvement fulfills a requirement

Definition at line 6065 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ is_achievement_req_active()

static enum fc_tristate is_achievement_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an achievement requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an achievement requirement

Definition at line 4088 of file requirements.c.

## ◆ is_action_req_active()

static enum fc_tristate is_action_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an action requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an action requirement

Definition at line 2389 of file requirements.c.

## ◆ is_activity_req_active()

static enum fc_tristate is_activity_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an activity requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an activity requirement

Definition at line 3642 of file requirements.c.

## ◆ is_age_req_active()

static enum fc_tristate is_age_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an age requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an age requirement

Definition at line 3757 of file requirements.c.

## ◆ is_ai_req_active()

static enum fc_tristate is_ai_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an AI level requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an AI level requirement

Definition at line 3064 of file requirements.c.

## ◆ is_building_req_active()

static enum fc_tristate is_building_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a building requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a building requirement

Definition at line 1745 of file requirements.c.

## ◆ is_buildinggenus_req_active()

static enum fc_tristate is_buildinggenus_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a building genus requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a building genus requirement

Definition at line 1896 of file requirements.c.

## ◆ is_city_in_tile()

static bool is_city_in_tile | ( | const struct tile * | ptile,
|  | const struct city * | pcity
| ) |  |

static

Is center of given city in tile. If city is NULL, any city will do.

Definition at line 3800 of file requirements.c.

Referenced by is_citytile_req_active().

## ◆ is_citystatus_req_active()

static enum fc_tristate is_citystatus_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a city status requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a city status requirement

Definition at line 3973 of file requirements.c.

## ◆ is_citytile_req_active()

static enum fc_tristate is_citytile_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a citytile requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a citytile requirement

Definition at line 3818 of file requirements.c.

## ◆ is_diplrel_in_range()

static enum fc_tristate is_diplrel_in_range | ( | const struct player * | target_player,
|  | const struct player * | other_player,
|  | enum req_range | range,
|  | int | diplrel
| ) |  |

static

Is the diplomatic state within range of the target?

Definition at line 3273 of file requirements.c.

Referenced by is_diplrel_req_active(), is_diplrel_tile_o_req_active(), is_diplrel_tile_req_active(), and is_diplrel_unitany_in_range().

## ◆ is_diplrel_req_active()

static enum fc_tristate is_diplrel_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a diplomatic relationship (diplrel) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a diplrel requirement

Definition at line 3325 of file requirements.c.

## ◆ is_diplrel_tile_o_req_active()

static enum fc_tristate is_diplrel_tile_o_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a tile owner / other player diplomatic relationship (diplrel_tile_o) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a diplrel_tile_o requirement

Definition at line 3369 of file requirements.c.

## ◆ is_diplrel_tile_req_active()

static enum fc_tristate is_diplrel_tile_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a tile owner diplomatic relationship (diplrel_tile) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a diplrel_tile requirement

Definition at line 3345 of file requirements.c.

## ◆ is_diplrel_unitany_in_range()

static enum fc_tristate is_diplrel_unitany_in_range | ( | const struct tile * | target_tile,
|  | const struct player * | other_player,
|  | enum req_range | range,
|  | int | diplrel
| ) |  |

static

Is the diplomatic state within range of any unit at the target tile?

Definition at line 3387 of file requirements.c.

Referenced by is_diplrel_unitany_o_req_active(), and is_diplrel_unitany_req_active().

## ◆ is_diplrel_unitany_o_req_active()

static enum fc_tristate is_diplrel_unitany_o_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an any-unit-owner / other player diplomatic relationship (diplrel_unitany_o) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a diplrel_unitany_o requirement

Definition at line 3440 of file requirements.c.

## ◆ is_diplrel_unitany_req_active()

static enum fc_tristate is_diplrel_unitany_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an any-unit-owner diplomatic relationship (diplrel_unitany) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a diplrel_unitany requirement

Definition at line 3418 of file requirements.c.

## ◆ is_extra_req_active()

static enum fc_tristate is_extra_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an extra requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an extra requirement

Definition at line 2255 of file requirements.c.

## ◆ is_extraflag_req_active()

static enum fc_tristate is_extraflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an extra flag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an extraflag requirement

Definition at line 2846 of file requirements.c.

## ◆ is_good_req_active()

static enum fc_tristate is_good_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a goods requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a goods requirement

Definition at line 2348 of file requirements.c.

## ◆ is_gov_req_active()

static enum fc_tristate is_gov_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a government (gov) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a gov requirement

Definition at line 2983 of file requirements.c.

## ◆ is_maxunitsontile_req_active()

static enum fc_tristate is_maxunitsontile_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a maximum units on tile requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a maxunitsontile requirement

Definition at line 2187 of file requirements.c.

## ◆ is_mincalfrag_req_active()

static enum fc_tristate is_mincalfrag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum calendar fragment requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a mincalfrag requirement

Definition at line 4151 of file requirements.c.

## ◆ is_minculture_req_active()

static enum fc_tristate is_minculture_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum culture requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minculture requirement

Definition at line 2044 of file requirements.c.

## ◆ is_minforeignpct_req_active()

static enum fc_tristate is_minforeignpct_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum foreign population requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minforeignpct requirement

Definition at line 2117 of file requirements.c.

## ◆ is_minhitpoints_req_active()

static enum fc_tristate is_minhitpoints_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum hitpoints requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minhitpoints requirement

Definition at line 3734 of file requirements.c.

## ◆ is_minmovefrags_req_active()

static enum fc_tristate is_minmovefrags_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum movement fragments (minmovefrags) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minmovefrags requirement

Definition at line 3710 of file requirements.c.

## ◆ is_minsize_req_active()

static enum fc_tristate is_minsize_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum size requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minsize requirement

Definition at line 4045 of file requirements.c.

## ◆ is_mintechs_req_active()

static enum fc_tristate is_mintechs_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum technologies requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a mintechs requirement

Definition at line 3029 of file requirements.c.

## ◆ is_minveteran_req_active()

static enum fc_tristate is_minveteran_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum veteran level (minveteran) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minveteran requirement

Definition at line 3686 of file requirements.c.

## ◆ is_minyear_req_active()

static enum fc_tristate is_minyear_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a minimum year requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a minyear requirement

Definition at line 4133 of file requirements.c.

## ◆ is_nation_req_active()

static enum fc_tristate is_nation_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a nation requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a nation requirement

Definition at line 3088 of file requirements.c.

## ◆ is_nationality_req_active()

static enum fc_tristate is_nationality_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a nationality requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a nationality requirement

Definition at line 3205 of file requirements.c.

## ◆ is_nationgroup_req_active()

static enum fc_tristate is_nationgroup_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a nation group requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a nation group requirement

Definition at line 3149 of file requirements.c.

## ◆ is_none_req_active()

static enum fc_tristate is_none_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Included for completeness. Determine whether a trivial (none) requirement is satisfied in a given context (it always is), ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a none requirement

Definition at line 1633 of file requirements.c.

## ◆ is_outputtype_req_active()

static enum fc_tristate is_outputtype_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether an output type requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be an output type requirement

Definition at line 2410 of file requirements.c.

## ◆ is_req_active()

bool is_req_active | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req,
|  | const enum req_problem_type | prob_type
| ) |  |

Checks the requirement to see if it is active on the given target.

context gives the target (or targets) to evaluate against req gives the requirement itself

context may be NULL. This is equivalent to passing an empty context.

Make sure you give all aspects of the target when calling this function: for instance if you have TARGET_CITY pass the city's owner as the target player as well as the city itself as the target city.

Definition at line 4268 of file requirements.c.

Referenced by adjust_improvement_wants_by_effects(), adjust_wants_for_reqs(), adv_units_ruleset_init(), are_reqs_active(), can_player_build_improvement_direct(), can_player_build_unit_direct(), city_landlocked_sell_coastal_improvements(), dai_cant_help_req(), dai_find_source_building(), dai_gov_value(), dai_tech_effect_values(), dai_wants_defender_against(), get_potential_improvement_bonus(), improvement_obsolete(), is_effect_prevented(), is_req_preventing(), mke_eval_req(), utype_needs_improvement(), and worklist_item_postpone_req_vec().

## ◆ is_req_in_vec()

bool is_req_in_vec | ( | const struct requirement * | req,
|  | const struct requirement_vector * | vec
| ) |  |

Returns TRUE iff the requirement vector vec contains the requirement req.

Definition at line 4649 of file requirements.c.

Referenced by rscompat_postprocess(), tgt_citytile_act_cache_set(), and unit_state_action_cache_set().

## ◆ is_req_preventing()

enum req_unchanging_status is_req_preventing | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req,
|  | enum req_problem_type | prob_type
| ) |  |

Returns whether this requirement is unfulfilled and probably won't be ever

Definition at line 4619 of file requirements.c.

Referenced by can_city_build_improvement_later(), can_player_build_improvement_later(), dai_cant_help_req(), reqs_may_activate(), and tactical_req_cb().

## ◆ is_req_unchanging()

enum req_unchanging_status is_req_unchanging | ( | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

Gives a suggestion may req ever evaluate to another value with given context. (The other player is not supplied since it has no value for changeability of any requirement for now.)

Note this isn't absolute. Result other than REQUCH_NO here just means that the requirement probably can't change its value afterwards.

Definition at line 4571 of file requirements.c.

Referenced by is_req_preventing(), and sanity_check_ruleset_data().

## ◆ is_roadflag_req_active()

static enum fc_tristate is_roadflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a road flag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a roadflag requirement

Definition at line 2753 of file requirements.c.

## ◆ is_serversetting_req_active()

static enum fc_tristate is_serversetting_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a server setting requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a server setting requirement

Definition at line 4190 of file requirements.c.

## ◆ is_specialist_req_active()

static enum fc_tristate is_specialist_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a specialist requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a specialist requirement

Definition at line 2430 of file requirements.c.

## ◆ is_style_req_active()

static enum fc_tristate is_style_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a style requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a style requirement

Definition at line 3006 of file requirements.c.

## ◆ is_tech_req_active()

static enum fc_tristate is_tech_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a tech requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a tech requirement

Definition at line 1917 of file requirements.c.

## ◆ is_techflag_req_active()

static enum fc_tristate is_techflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a tech flag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a techflag requirement

Definition at line 1981 of file requirements.c.

## ◆ is_terrain_req_active()

static enum fc_tristate is_terrain_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a terrain type requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a terrain requirement

Definition at line 2450 of file requirements.c.

## ◆ is_terrainalter_req_active()

static enum fc_tristate is_terrainalter_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a terrain-alteration-possible (terrainalter) requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a terrainalter requirement

Definition at line 2938 of file requirements.c.

## ◆ is_terrainclass_req_active()

static enum fc_tristate is_terrainclass_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a terrain class requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a terrain class requirement

Definition at line 2546 of file requirements.c.

## ◆ is_terrainflag_req_active()

static enum fc_tristate is_terrainflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a terrain flag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a terrain flag requirement

Definition at line 2647 of file requirements.c.

## ◆ is_topology_req_active()

static enum fc_tristate is_topology_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a topology requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a topology requirement

Definition at line 4170 of file requirements.c.

## ◆ is_unitclass_req_active()

static enum fc_tristate is_unitclass_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a unitclass requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a unitclass requirement

Definition at line 3518 of file requirements.c.

## ◆ is_unitclassflag_req_active()

static enum fc_tristate is_unitclassflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a unitclassflag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a unitclassflag requirement

Definition at line 3548 of file requirements.c.

## ◆ is_unitflag_req_active()

static enum fc_tristate is_unitflag_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a unitflag requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a unitflag requirement

Definition at line 3489 of file requirements.c.

## ◆ is_unitstate_req_active()

static enum fc_tristate is_unitstate_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a unitstate requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a unitstate requirement

Definition at line 3577 of file requirements.c.

## ◆ is_unittype_req_active()

static enum fc_tristate is_unittype_req_active | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Determine whether a unittype requirement is satisfied in a given context, ignoring parts of the requirement that can be handled uniformly for all requirement types.

context and req must not be null, and req must be a unittype requirement

Definition at line 3460 of file requirements.c.

## ◆ nation_contra_group()

static bool nation_contra_group | ( | const struct requirement * | nation_req,
|  | const struct requirement * | group_req
| ) |  |

static

Returns TRUE if the specified nation requirement contradicts the specified nation group requirement.

Definition at line 1353 of file requirements.c.

Referenced by are_requirements_contradictions().

## ◆ nation_found()

static enum req_item_found nation_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a nation fulfills a requirement

Definition at line 6026 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ num_city_buildings()

static int num_city_buildings | ( | const struct city * | pcity,
|  | const struct impr_type * | building
| ) |  |

static

Returns the number of buildings of a certain type in a city.

Definition at line 1731 of file requirements.c.

Referenced by is_building_req_active().

## ◆ num_continent_buildings()

static int num_continent_buildings | ( | const struct player * | pplayer,
|  | int | continent,
|  | const struct impr_type * | building
| ) |  |

static

Returns the number of buildings of a certain type on a continent.

Definition at line 1711 of file requirements.c.

Referenced by is_building_req_active().

## ◆ num_player_buildings()

static int num_player_buildings | ( | const struct player * | pplayer,
|  | const struct impr_type * | building
| ) |  |

static

Returns the number of buildings of a certain type owned by plr.

Definition at line 1697 of file requirements.c.

Referenced by is_building_req_active().

## ◆ num_world_buildings()

static int num_world_buildings | ( | const struct impr_type * | building | ) |

static

Returns the number of buildings of a certain type in the world.

Definition at line 1661 of file requirements.c.

Referenced by is_building_req_active().

## ◆ num_world_buildings_total()

static int num_world_buildings_total | ( | const struct impr_type * | building | ) |

static

Returns the number of total world buildings (this includes buildings that have been destroyed).

Definition at line 1647 of file requirements.c.

Referenced by is_building_req_active().

## ◆ output_type_found()

static enum req_item_found output_type_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if an output type fulfills a requirement

Definition at line 6306 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ player_has_ever_built()

static bool player_has_ever_built | ( | const struct player * | pplayer,
|  | const struct impr_type * | building
| ) |  |

static

Returns whether a building of a certain type has ever been built by pplayer, even if it has subsequently been destroyed.

Note: the implementation of this is no different in principle from num_world_buildings_total(), but the semantics are different because unlike a great wonder, a small wonder could be destroyed and rebuilt many times, requiring return of values >1, but there's no record kept to support that. Fortunately, the only current caller doesn't need the exact number.

Definition at line 1682 of file requirements.c.

Referenced by is_building_req_active().

## ◆ players_in_same_range()

static bool players_in_same_range | ( | const struct player * | pplayer1,
|  | const struct player * | pplayer2,
|  | enum req_range | range
| ) |  |

inlinestatic

Returns TRUE if players are in the same requirements range.

Definition at line 1591 of file requirements.c.

Referenced by is_achievement_req_active(), is_building_req_active(), is_diplrel_in_range(), is_minculture_req_active(), is_nation_req_active(), is_nationgroup_req_active(), is_tech_req_active(), and is_techflag_req_active().

## ◆ present_implies_not_present()

static bool present_implies_not_present | ( | const struct requirement * | req1,
|  | const struct requirement * | req2
| ) |  |

static

Returns TRUE if req1 and req2 contradicts each other because a present requirement implies the presence of a !present requirement according to the knowledge about implications in universal_found_function.

Definition at line 1380 of file requirements.c.

Referenced by are_requirements_contradictions().

## ◆ req_context_empty()

const struct req_context * req_context_empty | ( | void |  | ) |

Returns a pointer to a statically-allocated, empty requirement context.

Definition at line 901 of file requirements.c.

Referenced by action_enabled_local(), action_hard_reqs_actor(), action_prob(), get_effect_expected_value(), get_target_bonus_effects(), is_action_possible(), is_req_knowable(), and tri_req_present().

## ◆ req_copy()

void req_copy | ( | struct requirement * | dst,
|  | const struct requirement * | src
| ) |  |

Fill in copy of the requirement.

Definition at line 1283 of file requirements.c.

Referenced by req_implies_req().

## ◆ req_from_str()

struct requirement req_from_str | ( | const char * | type,
|  | const char * | range,
|  | bool | survives,
|  | bool | present,
|  | bool | quiet,
|  | const char * | value
| ) |  |

Parse a requirement type and value string into a requirement structure. Returns the invalid element for enum universal_n on error. Passing in a NULL type is considered VUT_NONE (not an error).

Pass this some values like "Building", "Factory".

Definition at line 938 of file requirements.c.

Referenced by effect_edit::add_now(), effect_list_compat_cb(), load_ruleset_cities(), lookup_req_list(), paratroopers_mr_sub_to_effect(), rscompat_old_slow_invasions_3_1(), rscompat_postprocess(), slow_invasion_effects(), and slow_invasion_enablers().

## ◆ req_from_values()

struct requirement req_from_values | ( | int | type,
|  | int | range,
|  | bool | survives,
|  | bool | present,
|  | bool | quiet,
|  | int | value
| ) |  |

Set the values of a req from serializable integers. This is the opposite of req_get_values.

Definition at line 1249 of file requirements.c.

Referenced by req_edit::add_now(), dio_get_requirement_raw(), effect_to_enabler(), hard_code_oblig_hard_reqs(), hard_code_oblig_hard_reqs_ruleset(), load_action_auto_uflag_block(), load_action_post_success_force(), load_ruleset_units(), rscompat_auto_attack_3_1(), rscompat_old_slow_invasions_3_1(), rscompat_postprocess(), rscompat_req_vec_adjust_3_1(), send_ruleset_techs(), slow_invasion_effects(), and slow_invasion_enablers().

## ◆ req_get_values()

void req_get_values | ( | const struct requirement * | req,
|  | int * | type,
|  | int * | range,
|  | bool * | survives,
|  | bool * | present,
|  | bool * | quiet,
|  | int * | value
| ) |  |

Return the value of a req as a serializable integer. This is the opposite of req_set_value.

Definition at line 1268 of file requirements.c.

Referenced by dio_put_requirement_raw().

## ◆ req_implies_req()

bool req_implies_req | ( | const struct requirement * | req1,
|  | const struct requirement * | req2
| ) |  |

Returns TRUE if req2 is always fulfilled when req1 is (i.e. req1 => req2)

Definition at line 1421 of file requirements.c.

Referenced by default_tester_cb().

## ◆ req_is_impossible_to_fulfill()

bool req_is_impossible_to_fulfill | ( | const struct requirement * | req | ) |

Returns TRUE iff the specified requirement is known to be impossible to fulfill. Note that this function may return FALSE even when it is impossible to fulfill a requirement if it can't detect it.

Parameters

  req | the requirement to check the possibility of.

Returns
  TRUE iff the requirement never can be fulfilled.

Definition at line 4756 of file requirements.c.

Referenced by req_vec_is_impossible_to_fulfill().

## ◆ req_to_fstring()

const char * req_to_fstring | ( | const struct requirement * | req,
|  | struct astring * | astr
| ) |  |

Returns the given requirement as a formatted string ready for printing. Does not care about the 'quiet' property.

astring does not need to be initialized before the call, but caller needs to call astr_free() for it once the returned string is no longer needed.

Definition at line 916 of file requirements.c.

Referenced by effect_list_sanity_cb(), enabler_first_self_contradiction(), enabler_tile_tgt_local_diplrel_implies_claimed(), req_vec_change_translation(), req_vec_get_first_contradiction(), req_vec_get_first_missing_univ(), req_vec_get_first_redundant_req(), sanity_check_ruleset_data(), and save_action_auto_uflag_block().

## ◆ req_vec_by_number()

struct requirement_vector * req_vec_by_number | ( | const void * | parent_item,
|  | req_vec_num_in_item | number
| ) |  |

Returns a writable pointer to the specified requirement vector in the specified requirement vector or NULL if the parent item doesn't have a requirement vector with that requirement vector number.

Parameters

  parent_item | the item that should have the requirement vector.
  number | the item's requirement vector number.

Returns
  a pointer to the specified requirement vector.

Definition at line 4808 of file requirements.c.

Referenced by purge_duplicate_req_vec(), and purge_unused_req_vec().

## ◆ req_vec_change_apply()

bool req_vec_change_apply | ( | const struct req_vec_change * | modification,
|  | requirement_vector_by_number | getter,
|  | const void * | parent_item
| ) |  |

Returns TRUE iff the specified requirement vector modification was successfully applied to the specified target requirement vector.

Parameters

  modification | the requirement vector change
  getter | a function that returns a pointer to the requirement vector the change should be applied to given a ruleset item and the vectors number in the item.
  parent_item | the item to apply the change to.

Returns
  if the specified modification was successfully applied

Definition at line 4897 of file requirements.c.

Referenced by req_vec_fix::apply_solution(), purge_duplicate_req_vec(), purge_unused_req_vec(), and rscompat_enabler_add_obligatory_hard_reqs().

## ◆ req_vec_change_translation()

const char * req_vec_change_translation | ( | const struct req_vec_change * | change,
|  | const requirement_vector_namer | namer
| ) |  |

Returns the specified requirement vector change as a translated string ready for use in the user interface. N.B.: The returned string is static, so every call to this function overwrites the previous.

Parameters

  change | the requirement vector change
  namer | a function that returns a description of the vector to change for the item the vector belongs to.

Returns
  the specified requirement vector change

Definition at line 4824 of file requirements.c.

Referenced by req_vec_fix::apply_solution(), req_vec_fix_problem::req_vec_fix_problem(), and rscompat_enabler_add_obligatory_hard_reqs().

## ◆ req_vec_get_first_contradiction()

struct req_vec_problem * req_vec_get_first_contradiction | ( | const struct requirement_vector * | vec,
|  | requirement_vector_number | get_num,
|  | const void * | parent_item
| ) |  |

Returns the first self contradiction found in the specified requirement vector with suggested solutions or NULL if no contradiction was found. It is the responsibility of the caller to free the suggestion when it is done with it.

Parameters

  vec | the requirement vector to look in.
  get_num | function that returns the requirement vector's number in the parent item.
  parent_item | the item that owns the vector.

Returns
  the first self contradiction found.

Definition at line 5014 of file requirements.c.

Referenced by req_vec_suggest_repair().

## ◆ req_vec_get_first_missing_univ()

struct req_vec_problem * req_vec_get_first_missing_univ | ( | const struct requirement_vector * | vec,
|  | requirement_vector_number | get_num,
|  | const void * | parent_item
| ) |  |

Returns the first universal known to always be absent in the specified requirement vector with suggested solutions or NULL if no missing universals were found. It is the responsibility of the caller to free the suggestion when it is done with it.

Parameters

  vec | the requirement vector to look in.
  get_num | function that returns the requirement vector's number in the parent item.
  parent_item | the item that owns the vector.

Returns
  the first missing universal found.

Definition at line 5100 of file requirements.c.

Referenced by purge_unused_req_vec(), and req_vec_suggest_improvement().

## ◆ req_vec_get_first_redundant_req()

struct req_vec_problem * req_vec_get_first_redundant_req | ( | const struct requirement_vector * | vec,
|  | requirement_vector_number | get_num,
|  | const void * | parent_item
| ) |  |

Returns the first redundant requirement in the specified requirement vector with suggested solutions or NULL if no redundant requirements were found. It is the responsibility of the caller to free the suggestion when it is done with it.

Parameters

  vec | the requirement vector to look in.
  get_num | function that returns the requirement vector's number in the parent item.
  parent_item | the item that owns the vector.

Returns
  the first redundant requirement found.

Definition at line 5185 of file requirements.c.

Referenced by purge_duplicate_req_vec(), and req_vec_suggest_improvement().

## ◆ req_vec_is_impossible_to_fulfill()

bool req_vec_is_impossible_to_fulfill | ( | const struct requirement_vector * | reqs | ) |

Returns TRUE iff the specified requirement vector is known to be impossible to fulfill. Note that this function may return FALSE even when it is impossible to fulfill a requirement if it can't detect it.

Parameters

  reqs | the requirement vector to check the possibility of.

Returns
  TRUE iff the requirement vector never can be fulfilled.

Definition at line 4769 of file requirements.c.

Referenced by action_enabler_utype_possible_actor(), ruleset_purge_unused_effects(), and ruleset_purge_unused_enablers().

## ◆ req_vec_problem_free()

void req_vec_problem_free | ( | struct req_vec_problem * | issue | ) |

De-allocates resources associated with the given requirement vector problem.

Parameters

  issue | the no longer needed problem.

Definition at line 4994 of file requirements.c.

Referenced by enabler_problem_level(), purge_duplicate_req_vec(), purge_unused_req_vec(), req_vec_fix::refresh(), req_vec_get_first_missing_univ(), rscompat_enabler_add_obligatory_hard_reqs(), sanity_check_req_vec(), sanity_check_ruleset_data(), and req_vec_fix::~req_vec_fix().

## ◆ req_vec_problem_new()

struct req_vec_problem * req_vec_problem_new | ( | int | num_suggested_solutions,
|  | const char * | descr,
|  |  | ...
| ) |  |

Returns a new requirement vector problem with the specified number of suggested solutions and the specified description. The suggestions are added by the caller.

Parameters

  num_suggested_solutions | the number of suggested solutions.
  descr | the description of the problem as a format string

Returns
  the new requirement vector problem.

Definition at line 4969 of file requirements.c.

Referenced by action_enabler_suggest_improvement(), ae_suggest_repair_if_no_oblig(), enabler_first_self_contradiction(), enabler_tile_tgt_local_diplrel_implies_claimed(), req_vec_get_first_contradiction(), req_vec_get_first_missing_univ(), and req_vec_get_first_redundant_req().

## ◆ req_vec_problem_new_transl()

struct req_vec_problem * req_vec_problem_new_transl | ( | int | num_suggested_solutions,
|  | const char * | description,
|  | const char * | description_translated
| ) |  |

Returns a new requirement vector problem with the specified number of suggested solutions and the specified description. The suggestions are added by the caller.

Parameters

  num_suggested_solutions | the number of suggested solutions.
  description | the description of the problem.
  description_translated | the translated description of the problem.

Returns
  the new requirement vector problem.

Definition at line 4935 of file requirements.c.

Referenced by req_vec_problem_new().

## ◆ req_vec_suggest_improvement()

struct req_vec_problem * req_vec_suggest_improvement | ( | const struct requirement_vector * | vec,
|  | requirement_vector_number | get_num,
|  | const void * | parent_item
| ) |  |

Returns a suggestion to improve the specified requirement vector or NULL if nothing to improve is found. It is the responsibility of the caller to free the suggestion when it is done with it. A possible improvement isn't always an error.

Parameters

  vec | the requirement vector to look in.
  get_num | function that returns the requirement vector's number in the parent item.
  parent_item | the item that owns the vector.

Returns
  the first improvement suggestion found.

Definition at line 5251 of file requirements.c.

Referenced by action_enabler_suggest_improvement().

## ◆ req_vec_suggest_repair()

struct req_vec_problem * req_vec_suggest_repair | ( | const struct requirement_vector * | vec,
|  | requirement_vector_number | get_num,
|  | const void * | parent_item
| ) |  |

Returns a suggestion to fix the specified requirement vector or NULL if no fix is found to be needed. It is the responsibility of the caller to free the suggestion when it is done with it.

Parameters

  vec | the requirement vector to look in.
  get_num | function that returns the requirement vector's number in the parent item.
  parent_item | the item that owns the vector.

Returns
  the first error found.

Definition at line 5079 of file requirements.c.

Referenced by action_enabler_suggest_repair(), req_vec_suggest_improvement(), and sanity_check_req_vec().

## ◆ req_vec_vector_number()

req_vec_num_in_item req_vec_vector_number | ( | const void * | parent_item,
|  | const struct requirement_vector * | vec
| ) |  |

Returns the requirement vector number of the specified requirement vector in the specified requirement vector.

Parameters

  parent_item | the item that may own the vector.
  vec | the requirement vector to number.

Returns
  the requirement vector number the vector has in the parent item.

Definition at line 4789 of file requirements.c.

Referenced by purge_duplicate_req_vec(), purge_unused_req_vec(), and sanity_check_req_vec().

## ◆ req_vec_wants_type()

bool req_vec_wants_type | ( | const struct requirement_vector * | reqs,
|  | enum universals_n | kind
| ) |  |

Returns TRUE iff the specified requirement vector has a positive requirement of the specified requirement type.

Parameters

  reqs | the requirement vector to look in
  kind | the requirement type to look for

Definition at line 4667 of file requirements.c.

Referenced by city_production_caravan_shields_init().

## ◆ requirement_kind_ereq()

int requirement_kind_ereq | ( | const int | value,
|  | const enum req_range | range,
|  | const bool | present,
|  | const int | max_value
| ) |  |

Returns (the position of) the given requirement's enumerator in the enumeration of all possible requirements of its requirement kind.

Note: Since this isn't used for any requirement type that supports surviving requirements those aren't supported. Add support if a user appears.

Definition at line 6388 of file requirements.c.

## ◆ terrain_type_found()

static enum req_item_found terrain_type_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a terrain type fulfills a requirement

Definition at line 6166 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ tri_req_active()

enum fc_tristate tri_req_active | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

Evaluates req in context with other_player to fc_tristate.

context may be NULL. This is equivalent to passing an empty context.

Fields of context that are NULL are considered unspecified and will produce TRI_MAYBE if req needs them to evaluate.

Definition at line 4328 of file requirements.c.

Referenced by default_tester_cb(), tactical_req_cb(), and tri_req_active_turns().

## ◆ tri_req_active_turns()

enum fc_tristate tri_req_active_turns | ( | int | pass,
|  | int | period,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

For requirements changing with time, will they be active for the target after pass in period turns if nothing else changes? Since year and calfrag changing is effect dependent, the result may appear not precise. (Does not consider research progress etc.)

Definition at line 4381 of file requirements.c.

Referenced by tactical_req_cb().

## ◆ tri_req_present()

static enum fc_tristate tri_req_present | ( | const struct civ_map * | nmap,
|  | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement * | req
| ) |  |

static

Applies the standard evaluation of req in context, ignoring req->present.

context may be NULL. This is equivalent to passing an empty context.

Fields of context that are NULL are considered unspecified and will produce TRI_MAYBE if req needs them to evaluate.

Definition at line 4299 of file requirements.c.

Referenced by is_req_active(), tri_req_active(), unchanging_building(), unchanging_noally(), and unchanging_present().

## ◆ tri_reqs_cb_active()

enum fc_tristate tri_reqs_cb_active | ( | const struct req_context * | context,
|  | const struct player * | other_player,
|  | const struct requirement_vector * | reqs,
|  | struct requirement_vector * | maybe_reqs,
|  | req_tester_cb | tester,
|  | void * | data,
|  | int | n_data
| ) |  |

Test requirements in reqs with tester according to (data, n_data) and give the resulting tristate. If maybe_reqs is not NULL, copies requirements that are evaluated to TRI_MAYBE into it (stops as soon as one evaluates to TRI_NO).

Definition at line 4524 of file requirements.c.

Referenced by action_may_happen_unit_on_city().

## ◆ unchanging_building()

static enum req_unchanging_status unchanging_building | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Special Building case handler. Sometimes building is just a constant parameter, and sometimes it subjects to wonder building rules. Also, there is obsoletion...

Definition at line 185 of file requirements.c.

## ◆ unchanging_citystatus()

static enum req_unchanging_status unchanging_citystatus | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Special CityStatus case handler. Currently OwnedByOriginal only

Definition at line 166 of file requirements.c.

## ◆ unchanging_citytile()

static enum req_unchanging_status unchanging_citytile | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Special CityTile case handler. Currently, only city center requirement depends on the city, but other ones are fulfilled on (C)Adjacent tiles

Definition at line 144 of file requirements.c.

## ◆ unchanging_local()

static enum req_unchanging_status unchanging_local | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Never changes in local range Mostly it's about requirements evaluated from constants and persistent ruleset objects passed in the context.

Definition at line 75 of file requirements.c.

## ◆ unchanging_noally()

static enum req_unchanging_status unchanging_noally | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Unchanging except if provided by an ally and not the player themself Alliances may break, team members may be destroyed or reassigned

Definition at line 120 of file requirements.c.

Referenced by is_req_unchanging().

## ◆ unchanging_present()

static enum req_unchanging_status unchanging_present | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

If not present, may appear; but once becomes present, never goes absent

Definition at line 88 of file requirements.c.

Referenced by is_req_unchanging(), and unchanging_world().

## ◆ unchanging_world()

static enum req_unchanging_status unchanging_world | ( | const struct civ_map * | nmap,
|  | enum req_unchanging_status | def,
|  | const struct req_context * | context,
|  | const struct requirement * | req
| ) |  |

static

Equals ..._present(), but never changes in World range

Definition at line 104 of file requirements.c.

## ◆ unit_activity_found()

static enum req_item_found unit_activity_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a unit activity fulfills a requirement

Definition at line 6147 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ unit_class_found()

static enum req_item_found unit_class_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a unit class fulfills a requirement

Definition at line 6096 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ unit_type_found()

static enum req_item_found unit_type_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a unit type fulfills a requirement

Definition at line 6119 of file requirements.c.

Referenced by universal_found_functions_init().

## ◆ universal_build_shield_cost()

int universal_build_shield_cost | ( | const struct city * | pcity,
|  | const struct universal * | target
| ) |  |

Return the number of shields it takes to build this universal.

Definition at line 5819 of file requirements.c.

Referenced by city_production_build_shield_cost(), city_turns_to_build(), get_city_dialog_production_full(), and get_production_name().

## ◆ universal_by_number()

struct universal universal_by_number | ( | const enum universals_n | kind,
|  | const int | value
| ) |  |

Combine values into a universal structure. This is for serialization and is the opposite of universal_extraction(). FIXME: ensure that every caller checks error return!

Definition at line 567 of file requirements.c.

Referenced by dio_get_worklist_raw(), effect_list_compat_cb(), handle_city_change(), handle_city_info(), and req_from_values().

## ◆ universal_by_rule_name()

struct universal universal_by_rule_name | ( | const char * | kind,
|  | const char * | value
| ) |  |

Parse requirement type (kind) and value strings into a universal structure. Passing in a NULL type is considered VUT_NONE (not an error).

Pass this some values like "Building", "Factory". FIXME: ensure that every caller checks error return!

Definition at line 231 of file requirements.c.

Referenced by global_worklists_build(), req_from_str(), sg_load_player_city(), sg_load_player_city(), worklist_load(), and worklist_load().

## ◆ universal_copy()

void universal_copy | ( | struct universal * | dst,
|  | const struct universal * | src
| ) |  |

Fill in copy of universal

Definition at line 770 of file requirements.c.

Referenced by req_copy().

## ◆ universal_extraction()

void universal_extraction | ( | const struct universal * | source,
|  | int * | kind,
|  | int * | value
| ) |  |

Extract universal structure into its components for serialization; the opposite of universal_by_number().

Definition at line 780 of file requirements.c.

Referenced by get_req_source_effects(), req_get_values(), help_widget::set_topic_building(), and universal_value_cb().

## ◆ universal_found_functions_init()

void universal_found_functions_init | ( | void |  | ) |

Initialise universal_found_function array.

Definition at line 6359 of file requirements.c.

Referenced by game_init().

## ◆ universal_fulfills_requirement()

enum req_item_found universal_fulfills_requirement | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

Will the universal 'source' fulfill this requirement?

Definition at line 5950 of file requirements.c.

Referenced by effect_value_from_universals(), present_implies_not_present(), universal_is_relevant_to_requirement(), and universals_say_everything().

## ◆ universal_fulfills_requirements()

bool universal_fulfills_requirements | ( | bool | check_necessary,
|  | const struct requirement_vector * | reqs,
|  | const struct universal * | source
| ) |  |

Will the universal 'source' fulfill the requirements in the list? If 'check_necessary' is FALSE: are there no requirements that 'source' would actively prevent the fulfilment of? If 'check_necessary' is TRUE: does 'source' help the requirements to be fulfilled? (NB 'source' might not be the only source of its type that would be sufficient; for instance, if 'source' is a specific terrain type, we can return TRUE even if the requirement is only for something vague like a TerrainClass.)

Definition at line 5971 of file requirements.c.

Referenced by action_enabler_utype_possible_actor(), action_univs_not_blocking(), help_widget::add_extras_of_act_for_terrain(), effect_cumulative_min(), helptext_building(), and universals_mean_unfulfilled().

## ◆ universal_is_legal_in_requirement()

bool universal_is_legal_in_requirement | ( | const struct universal * | univ | ) |

Returns TRUE iff the specified universal legally can appear in a requirement.

Definition at line 263 of file requirements.c.

Referenced by universal_kind_values().

## ◆ universal_is_mentioned_by_requirements()

bool universal_is_mentioned_by_requirements | ( | const struct requirement_vector * | reqs,
|  | const struct universal * | psource
| ) |  |

Returns TRUE iff the universal 'psource' is directly mentioned by any of the requirements in 'reqs'.

Definition at line 5858 of file requirements.c.

Referenced by effect_handle_split_universal(), effect_list_fill_cb(), effect_list_universal_needed_cb(), and is_universal_needed().

## ◆ universal_is_relevant_to_requirement()

bool universal_is_relevant_to_requirement | ( | const struct requirement * | req,
|  | const struct universal * | source
| ) |  |

Returns TRUE iff the specified universal is relevant to fulfilling the specified requirement.

Definition at line 6008 of file requirements.c.

Referenced by helptext_building().

## ◆ universal_name_translation()

const char * universal_name_translation | ( | const struct universal * | psource,
|  | char * | buf,
|  | size_t | bufsz
| ) |  |

Make user-friendly text for the source. The text is put into a user buffer which is also returned. This should be short, as it's used in lists like "Aqueduct+Size 8" when explaining a calculated value. It just needs to be enough to remind the player of rules they already know, not a complete explanation (use insert_requirement() for that).

Definition at line 5529 of file requirements.c.

Referenced by apply_disaster(), city_production_name_translation(), clipboard_copy_production(), diplomat_sabotage(), do_unit_strike_city_production(), get_city_dialog_production_full(), get_city_dialog_production_row(), get_city_mapview_production(), get_effect_req_text(), help_update_improvement(), help_update_wonder(), insert_allows_single(), manual_command(), popup_impr_info(), req_edit::refresh_item(), req_text_insert(), and help_widget::set_topic_building().

## ◆ universal_never_there()

bool universal_never_there | ( | const struct universal * | source | ) |

Returns TRUE iff the specified universal is known to never be there. Note that this function may return FALSE even when it is impossible for the universal to appear in the game if that can't be detected.

Parameters

  source | the universal to check the absence of.

Returns
  TRUE iff the universal never will appear.

Definition at line 4685 of file requirements.c.

Referenced by ae_suggest_repair_if_no_oblig(), req_is_impossible_to_fulfill(), and req_vec_get_first_missing_univ().

## ◆ universal_number()

int universal_number | ( | const struct universal * | source | ) |

Return the universal number of the constituent.

Definition at line 790 of file requirements.c.

Referenced by city_change_production(), clipboard_send_production_packet(), dio_put_worklist_raw(), package_city(), and universal_extraction().

## ◆ universal_replace_in_req_vec()

bool universal_replace_in_req_vec | ( | struct requirement_vector * | reqs,
|  | const struct universal * | to_replace,
|  | const struct universal * | replacement
| ) |  |

Replaces all instances of the universal to_replace with replacement in the requirement vector reqs and returns TRUE iff any requirements were replaced.

Definition at line 5838 of file requirements.c.

Referenced by effect_handle_split_universal().

## ◆ universal_rule_name()

const char * universal_rule_name | ( | const struct universal * | psource | ) |

Return the (untranslated) rule name of the universal. You don't have to free the return pointer.

Definition at line 5392 of file requirements.c.

Referenced by effect_edit::add_now(), define_orig_production_values(), effect_list_sanity_cb(), global_worklist_save(), global_worklists_unbuild(), req_to_fstring(), req_vec_get_first_missing_univ(), save_reqs_vector(), save_units_ruleset(), sg_save_player_cities(), and worklist_save().

## ◆ universal_type_rule_name()

const char * universal_type_rule_name | ( | const struct universal * | psource | ) |

Return untranslated name of the universal source name.

Definition at line 5811 of file requirements.c.

Referenced by effect_edit::add_now(), global_worklist_save(), global_worklists_unbuild(), req_to_fstring(), sanity_check_req_set(), sg_save_player_cities(), universal_fulfills_requirement(), universal_fulfills_requirements(), and worklist_save().

## ◆ universal_value_from_str()

void universal_value_from_str | ( | struct universal * | source,
|  | const char * | value
| ) |  |

Parse requirement value strings into a universal structure.

Definition at line 276 of file requirements.c.

Referenced by req_edit::univ_value_edit(), req_edit::univ_value_enum_menu(), and universal_by_rule_name().

## ◆ universals_mean_unfulfilled()

bool universals_mean_unfulfilled | ( | struct requirement_vector * | reqs,
|  | struct universal * | unis,
|  | size_t | n_unis
| ) |  |

Returns TRUE iff the presence of any of the specified universals is enough to guarantee that the specified requirement vector never will be fulfilled.

Parameters

  reqs | the requirement vector that never should be fulfilled
  unis | the universals that are present
  n_unis | the number of universals in unis

Returns
  if the universals blocks fulfillment of the req vector

Definition at line 5880 of file requirements.c.

Referenced by effect_cumulative_max(), and effect_universals_value_never_below().

## ◆ universals_say_everything()

bool universals_say_everything | ( | struct requirement_vector * | reqs,
|  | struct universal * | unis,
|  | size_t | n_unis
| ) |  |

Returns TRUE iff the presence of the specified universals is enough to know if the specified requirement vector is fulfilled. This means that the requirement vector can't check anything it can't find in the listed universals. Note that TRUE is returned both when the requirement vector is known to be fulfilled and when it is known to be unfulfilled.

Parameters

  reqs | the requirement vector certainty is wanted about
  unis | the universals that are present
  n_unis | the number of universals in unis

Returns
  TRUE iff the specified universals is everything required to find out whether the specified requirement vector is fulfilled or not

Definition at line 5913 of file requirements.c.

Referenced by effect_universals_value_never_below().

## ◆ ustate_found()

static enum req_item_found ustate_found | ( | const struct requirement * | preq,
|  | const struct universal * | source
| ) |  |

static

Find if a unit state property fulfills a requirement.

Definition at line 6322 of file requirements.c.

Referenced by universal_found_functions_init().

## Variable Documentation

## ◆ req_definitions

struct req_def req_definitions[VUT_COUNT]

static

Definition at line 4202 of file requirements.c.

Referenced by is_req_preventing(), is_req_unchanging(), and tri_req_present().

## ◆ universal_found_function

universal_found universal_found_function[VUT_COUNT] = {NULL}

static

Definition at line 50 of file requirements.c.

Referenced by present_implies_not_present(), universal_found_functions_init(), universal_fulfills_requirement(), and universal_fulfills_requirements().