Functions for working with ecs_id_t. More...

Collaboration diagram for Ids:

Functions
bool	ecs_id_is_tag (const ecs_world_t *world, ecs_id_t id)
	Returns whether specified id a tag.

bool	ecs_id_in_use (const ecs_world_t *world, ecs_id_t id)
	Returns whether specified id is in use.

ecs_entity_t	ecs_get_typeid (const ecs_world_t *world, ecs_id_t id)
	Get the type for an id.

bool	ecs_id_match (ecs_id_t id, ecs_id_t pattern)
	Utility to match an id with a pattern.

bool	ecs_id_is_pair (ecs_id_t id)
	Utility to check if id is a pair.

bool	ecs_id_is_wildcard (ecs_id_t id)
	Utility to check if id is a wildcard.

bool	ecs_id_is_valid (const ecs_world_t *world, ecs_id_t id)
	Utility to check if id is valid.

ecs_flags32_t	ecs_id_get_flags (const ecs_world_t *world, ecs_id_t id)
	Get flags associated with id.

const char *	ecs_id_flag_str (ecs_id_t id_flags)
	Convert id flag to string.

char *	ecs_id_str (const ecs_world_t *world, ecs_id_t id)
	Convert (component) id to string.

void	ecs_id_str_buf (const ecs_world_t world, ecs_id_t id, ecs_strbuf_t buf)
	Write (component) id string to buffer.

ecs_id_t	ecs_id_from_str (const ecs_world_t world, const char expr)
	Convert string to a (component) id.

Detailed Description

Functions for working with ecs_id_t.

Function Documentation

◆ ecs_get_typeid()

ecs_entity_t ecs_get_typeid	(	const ecs_world_t *	world,
		ecs_id_t	id )

Get the type for an id.

This operation returns the component id for an id, if the id is associated with a type. For a regular component with a non-zero size (an entity with the EcsComponent component) the operation will return the entity itself.

For an entity that does not have the EcsComponent component, or with an EcsComponent value with size 0, the operation will return 0.

For a pair id the operation will return the type associated with the pair, by applying the following queries in order:

The first pair element is returned if it is a component
0 is returned if the relationship entity has the Tag property
The second pair element is returned if it is a component
0 is returned.

Parameters

world	The world.
id	The id.

Returns: The type id of the id.

◆ ecs_id_flag_str()

const char * ecs_id_flag_str ( ecs_id_t id_flags )

Convert id flag to string.

This operation converts an id flag to a string.

Parameters

id_flags The id flag.

Returns: The id flag string, or NULL if no valid id is provided.

◆ ecs_id_from_str()

ecs_id_t ecs_id_from_str	(	const ecs_world_t *	world,
		const char *	expr )

Convert string to a (component) id.

This operation is the reverse of ecs_id_str(). The FLECS_SCRIPT addon is required for this operation to work.

Parameters

world	The world.
expr	The string to convert to an id.

◆ ecs_id_get_flags()

ecs_flags32_t ecs_id_get_flags	(	const ecs_world_t *	world,
		ecs_id_t	id )

Get flags associated with id.

This operation returns the internal flags (see api_flags.h) that are associated with the provided id.

Parameters

world	The world.
id	The id.

Returns: Flags associated with the id, or 0 if the id is not in use.

◆ ecs_id_in_use()

bool ecs_id_in_use	(	const ecs_world_t *	world,
		ecs_id_t	id )

Returns whether specified id is in use.

This operation returns whether an id is in use in the world. An id is in use if it has been added to one or more tables.

Parameters

world	The world.
id	The id.

Returns: Whether the id is in use.

◆ ecs_id_is_pair()

bool ecs_id_is_pair ( ecs_id_t id )

Utility to check if id is a pair.

Parameters

id The id.

Returns: True if id is a pair.

◆ ecs_id_is_tag()

bool ecs_id_is_tag	(	const ecs_world_t *	world,
		ecs_id_t	id )

Returns whether specified id a tag.

This operation returns whether the specified type is a tag (a component without data/size).

An id is a tag when:

it is an entity without the EcsComponent component
it has an EcsComponent with size member set to 0
it is a pair where both elements are a tag
it is a pair where the first element has the EcsPairIsTag tag

Parameters

world	The world.
id	The id.

Returns: Whether the provided id is a tag.

◆ ecs_id_is_valid()

bool ecs_id_is_valid	(	const ecs_world_t *	world,
		ecs_id_t	id )

Utility to check if id is valid.

A valid id is an id that can be added to an entity. Invalid ids are:

ids that contain wildcards
ids that contain invalid entities
ids that are 0 or contain 0 entities

Note that the same rules apply to removing from an entity, with the exception of wildcards.

Parameters

world	The world.
id	The id.

Returns: True if the id is valid.

◆ ecs_id_is_wildcard()

bool ecs_id_is_wildcard ( ecs_id_t id )

Utility to check if id is a wildcard.

Parameters

id The id.

Returns: True if id is a wildcard or a pair containing a wildcard.

◆ ecs_id_match()

bool ecs_id_match	(	ecs_id_t	id,
		ecs_id_t	pattern )

Utility to match an id with a pattern.

This operation returns true if the provided pattern matches the provided id. The pattern may contain a wildcard (or wildcards, when a pair).

Parameters

id	The id.
pattern	The pattern to compare with.

Returns: Whether the id matches the pattern.

◆ ecs_id_str()

char * ecs_id_str	(	const ecs_world_t *	world,
		ecs_id_t	id )

Convert (component) id to string.

This operation interprets the structure of an id and converts it to a string.

Parameters

world	The world.
id	The id to convert to a string.

Returns: The id converted to a string.

◆ ecs_id_str_buf()

void ecs_id_str_buf	(	const ecs_world_t *	world,
		ecs_id_t	id,
		ecs_strbuf_t *	buf )

Write (component) id string to buffer.

Same as ecs_id_str() but writes result to ecs_strbuf_t.

Parameters

world	The world.
id	The id to convert to a string.
buf	The buffer to write to.