ecs_observer_desc_t Struct Reference

Used with ecs_observer_init(). More...

#include <flecs.h>

Public Attributes
int32_t	_canary
	Used for validity testing.
ecs_entity_t	entity
	Existing entity to associate with an observer (optional).
ecs_query_desc_t	query
	Query for observer.
ecs_entity_t	events [8]
	Events to observe (OnAdd, OnRemove, OnSet).
bool	yield_existing
	When an observer is created, generate events from existing data.
bool	global_observer
	Global observers are tied to the lifespan of the world.
ecs_iter_action_t	callback
	Callback to invoke on an event, invoked when the observer matches.
ecs_run_action_t	run
	Callback invoked on an event.
void *	ctx
	User context to pass to callback.
ecs_ctx_free_t	ctx_free
	Callback to free ctx.
void *	callback_ctx
	Context associated with callback (for language bindings).
ecs_ctx_free_t	callback_ctx_free
	Callback to free callback ctx.
void *	run_ctx
	Context associated with run (for language bindings).
ecs_ctx_free_t	run_ctx_free
	Callback to free run ctx.
int32_t *	last_event_id
	Used for internal purposes.
int8_t	term_index_
	Used for internal purposes.
ecs_flags32_t	flags_
	Used for internal purposes.

Detailed Description

Used with ecs_observer_init().

Definition at line 1390 of file flecs.h.

Member Data Documentation

_canary

int32_t ecs_observer_desc_t::_canary

Used for validity testing.

Must be 0.

Definition at line 1392 of file flecs.h.

callback

ecs_iter_action_t ecs_observer_desc_t::callback

Callback to invoke on an event, invoked when the observer matches.

Definition at line 1413 of file flecs.h.

callback_ctx

void* ecs_observer_desc_t::callback_ctx

Context associated with callback (for language bindings).

Definition at line 1430 of file flecs.h.

callback_ctx_free

ecs_ctx_free_t ecs_observer_desc_t::callback_ctx_free

Callback to free callback ctx.

Definition at line 1433 of file flecs.h.

ctx

void* ecs_observer_desc_t::ctx

User context to pass to callback.

Definition at line 1424 of file flecs.h.

ctx_free

ecs_ctx_free_t ecs_observer_desc_t::ctx_free

Callback to free ctx.

Definition at line 1427 of file flecs.h.

entity

ecs_entity_t ecs_observer_desc_t::entity

Existing entity to associate with an observer (optional).

Definition at line 1395 of file flecs.h.

events

ecs_entity_t ecs_observer_desc_t::events[8]

Events to observe (OnAdd, OnRemove, OnSet).

Definition at line 1401 of file flecs.h.

flags_

ecs_flags32_t ecs_observer_desc_t::flags_

Used for internal purposes.

Do not set.

Definition at line 1444 of file flecs.h.

global_observer

bool ecs_observer_desc_t::global_observer

Global observers are tied to the lifespan of the world.

Creating a global observer does not create an entity, and therefore ecs_observer_init() will not return an entity handle.

Definition at line 1410 of file flecs.h.

last_event_id

int32_t* ecs_observer_desc_t::last_event_id

Used for internal purposes.

Do not set.

Definition at line 1442 of file flecs.h.

query

ecs_query_desc_t ecs_observer_desc_t::query

Query for observer.

Definition at line 1398 of file flecs.h.

run

ecs_run_action_t ecs_observer_desc_t::run

Callback invoked on an event.

When left to NULL, the default runner is used, which matches the event with the observer's query, and calls 'callback' when it matches. A reason to override the run function is to improve performance, if there are more efficient ways to test whether an event matches the observer than the general-purpose query matcher.

Definition at line 1421 of file flecs.h.

run_ctx

void* ecs_observer_desc_t::run_ctx

Context associated with run (for language bindings).

Definition at line 1436 of file flecs.h.

run_ctx_free

ecs_ctx_free_t ecs_observer_desc_t::run_ctx_free

Callback to free run ctx.

Definition at line 1439 of file flecs.h.

term_index_

int8_t ecs_observer_desc_t::term_index_

Used for internal purposes.

Do not set.

Definition at line 1443 of file flecs.h.

yield_existing

bool ecs_observer_desc_t::yield_existing

When an observer is created, generate events from existing data.

For example, EcsOnAdd Position would match all existing instances of Position.

Definition at line 1405 of file flecs.h.

---

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

• include/flecs.h