cubos::core::ecs::QueryFetcher class

Type meant to be specialized which implements for each argument type the necessary logic to extract it from the tables.

Template parameters
T	Argument type.

Public static functions

static auto term(World& world) -> QueryTerm: Creates a query term with unspecified targets for the argument type.

QueryFetcher(World& world, const QueryTerm& term): Called when a query is constructed for the first time.

void prepare(const ArchetypeId* targetArchetypes, int depth): Called when iteration starts for the given archetypes. Always called before fetch(), which may be called multiple times after this.
auto fetch(std::size_t row) -> T: Called to get the actual desired data for a specific match. Always called after prepare() has been called at least once.

Creates a query term with unspecified targets for the argument type.

Parameters
world	World being queried.
Returns	Term information.

Called when a query is constructed for the first time.

Parameters
world	World being queried.
term	Term corresponding to the argument being fetched, with specified targets.

Called when iteration starts for the given archetypes. Always called before fetch(), which may be called multiple times after this.

Parameters
targetArchetypes	Pointer to array with the archetype identifiers for the targets.
depth	Depth of the sparse relation table, if applicable.

Called to get the actual desired data for a specific match. Always called after prepare() has been called at least once.

Parameters
row	Row to fetch.