impl.hpp

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#pragma once
 
namespace flecs {
 
template <typename E>
inline E entity_view::to_constant() const {
#ifdef FLECS_META
    using U = typename std::underlying_type<E>::type;
    const E* ptr = static_cast<const E*>(ecs_get_id(world_, id_, 
        ecs_pair(flecs::Constant, _::type<U>::id(world_))));
    ecs_assert(ptr != NULL, ECS_INVALID_PARAMETER, "entity is not a constant");
    return ptr[0];
#else
    ecs_assert(false, ECS_UNSUPPORTED,
        "operation not supported without FLECS_META addon");
    return E();
#endif
}
 
template <typename E, if_t< is_enum<E>::value >>
inline flecs::entity world::to_entity(E constant) const {
    const auto& et = enum_type<E>(world_);
    return flecs::entity(world_, et.entity(constant));
}
 
}