builder.hpp

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/**
 * @file addons/cpp/mixins/query/builder.hpp
 * @brief Query builder.
 */
 
#pragma once
 
#include "../../utils/builder.hpp"
#include "builder_i.hpp"
 
namespace flecs {
namespace _ {
    template <typename ... Components>
    using query_builder_base = builder<
        query<Components...>, ecs_query_desc_t, query_builder<Components...>,
        query_builder_i, Components ...>;
}
 
/** Query builder.
 * 
 * @ingroup cpp_core_queries
 */
template <typename ... Components>
struct query_builder final : _::query_builder_base<Components...> {
    query_builder(flecs::world_t* world, flecs::entity query_entity)
        : _::query_builder_base<Components...>(world)
    {
        _::populate_signature<Components...>(world, this);
        this->desc_.entity = query_entity.id();
    }
 
    query_builder(flecs::world_t* world, const char *name = nullptr)
        : _::query_builder_base<Components...>(world)
    {
        _::populate_signature<Components...>(world, this);
        this->set_name(name);
    }
 
    template <typename Func>
    void each(Func&& func) {
        this->build().each(FLECS_FWD(func));
    }
};
 
}