builder.hpp

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#pragma once
 
#include "../../utils/function_traits.hpp"
#include "../../utils/node_builder.hpp"
#include "builder_i.hpp"
 
namespace flecs {
namespace _ {
    template <typename ... Components>
    using system_builder_base = node_builder<
        system, ecs_system_desc_t, system_builder<Components...>, 
        system_builder_i, Components ...>;
}

template <typename ... Components>
struct system_builder final : _::system_builder_base<Components...> {
    system_builder(flecs::world_t* world, const char *name = nullptr)
        : _::system_builder_base<Components...>(world, name)
    {
        _::sig<Components...>(world).populate(this);
 
#ifdef FLECS_PIPELINE
        ecs_add_id(world, this->desc_.entity, ecs_dependson(flecs::OnUpdate));
        ecs_add_id(world, this->desc_.entity, flecs::OnUpdate);
#endif
    }
 
    template <typename Func>
    system each(Func&& func);
 
private:
    template <typename ... CallbackComponents, typename Func>
    system each_callback(_::arg_list<CallbackComponents...>, Func&& func);
 
    template <typename ... CallbackComponents>
    void prepend_each_callback_signature();
};
 
}