Flecs v4.0
A fast entity component system (ECS) for C & C++
Loading...
Searching...
No Matches
ecs_query_desc_t Struct Reference

Used with ecs_query_init(). More...

#include <flecs.h>

Public Attributes

int32_t _canary
 Used for validity testing.
 
ecs_term_t terms [32]
 Query terms.
 
const char * expr
 Query DSL expression (optional)
 
ecs_query_cache_kind_t cache_kind
 Caching policy of query.
 
ecs_flags32_t flags
 Flags for enabling query features.
 
ecs_order_by_action_t order_by_callback
 Callback used for ordering query results.
 
ecs_sort_table_action_t order_by_table_callback
 Callback used for ordering query results.
 
ecs_entity_t order_by
 Component to sort on, used together with order_by_callback or order_by_table_callback.
 
ecs_id_t group_by
 Component id to be used for grouping.
 
ecs_group_by_action_t group_by_callback
 Callback used for grouping results.
 
ecs_group_create_action_t on_group_create
 Callback that is invoked when a new group is created.
 
ecs_group_delete_action_t on_group_delete
 Callback that is invoked when an existing group is deleted.
 
void * group_by_ctx
 Context to pass to group_by.
 
ecs_ctx_free_t group_by_ctx_free
 Function to free group_by_ctx.
 
void * ctx
 User context to pass to callback.
 
void * binding_ctx
 Context to be used for language bindings.
 
ecs_ctx_free_t ctx_free
 Callback to free ctx.
 
ecs_ctx_free_t binding_ctx_free
 Callback to free binding_ctx.
 
ecs_entity_t entity
 Entity associated with query (optional)
 

Detailed Description

Used with ecs_query_init().

Definition at line 1201 of file flecs.h.

Member Data Documentation

◆ _canary

int32_t ecs_query_desc_t::_canary

Used for validity testing.

Must be 0.

Definition at line 1203 of file flecs.h.

◆ binding_ctx

void* ecs_query_desc_t::binding_ctx

Context to be used for language bindings.

Definition at line 1259 of file flecs.h.

◆ binding_ctx_free

ecs_ctx_free_t ecs_query_desc_t::binding_ctx_free

Callback to free binding_ctx.

Definition at line 1265 of file flecs.h.

◆ cache_kind

ecs_query_cache_kind_t ecs_query_desc_t::cache_kind

Caching policy of query.

Definition at line 1212 of file flecs.h.

◆ ctx

void* ecs_query_desc_t::ctx

User context to pass to callback.

Definition at line 1256 of file flecs.h.

◆ ctx_free

ecs_ctx_free_t ecs_query_desc_t::ctx_free

Callback to free ctx.

Definition at line 1262 of file flecs.h.

◆ entity

ecs_entity_t ecs_query_desc_t::entity

Entity associated with query (optional)

Definition at line 1268 of file flecs.h.

◆ expr

const char* ecs_query_desc_t::expr

Query DSL expression (optional)

Definition at line 1209 of file flecs.h.

◆ flags

ecs_flags32_t ecs_query_desc_t::flags

Flags for enabling query features.

Definition at line 1215 of file flecs.h.

◆ group_by

ecs_id_t ecs_query_desc_t::group_by

Component id to be used for grouping.

Used together with the group_by_callback.

Definition at line 1232 of file flecs.h.

◆ group_by_callback

ecs_group_by_action_t ecs_query_desc_t::group_by_callback

Callback used for grouping results.

If the callback is not set, results will not be grouped. When set, this callback will be used to calculate a "rank" for each entity (table) based on its components. This rank is then used to sort entities (tables), so that entities (tables) of the same rank are "grouped" together when iterated.

Definition at line 1239 of file flecs.h.

◆ group_by_ctx

void* ecs_query_desc_t::group_by_ctx

Context to pass to group_by.

Definition at line 1250 of file flecs.h.

◆ group_by_ctx_free

ecs_ctx_free_t ecs_query_desc_t::group_by_ctx_free

Function to free group_by_ctx.

Definition at line 1253 of file flecs.h.

◆ on_group_create

ecs_group_create_action_t ecs_query_desc_t::on_group_create

Callback that is invoked when a new group is created.

The return value of the callback is stored as context for a group.

Definition at line 1243 of file flecs.h.

◆ on_group_delete

ecs_group_delete_action_t ecs_query_desc_t::on_group_delete

Callback that is invoked when an existing group is deleted.

The return value of the on_group_create callback is passed as context parameter.

Definition at line 1247 of file flecs.h.

◆ order_by

ecs_entity_t ecs_query_desc_t::order_by

Component to sort on, used together with order_by_callback or order_by_table_callback.

Definition at line 1228 of file flecs.h.

◆ order_by_callback

ecs_order_by_action_t ecs_query_desc_t::order_by_callback

Callback used for ordering query results.

If order_by_id is 0, the pointer provided to the callback will be NULL. If the callback is not set, results will not be ordered.

Definition at line 1220 of file flecs.h.

◆ order_by_table_callback

ecs_sort_table_action_t ecs_query_desc_t::order_by_table_callback

Callback used for ordering query results.

Same as order_by_callback, but more efficient.

Definition at line 1224 of file flecs.h.

◆ terms

ecs_term_t ecs_query_desc_t::terms[32]

Query terms.

Definition at line 1206 of file flecs.h.


The documentation for this struct was generated from the following file: