builder.hpp

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#pragma once
 
namespace flecs {
namespace _ {
 
// Macros for template types so we don't go cross-eyed
#define FLECS_TBUILDER template<typename ... Components> class
#define FLECS_IBUILDER template<typename IBase, typename ... Components> class
 
template<FLECS_TBUILDER T, typename TDesc, typename Base, FLECS_IBUILDER IBuilder, typename ... Components>
struct builder : IBuilder<Base, Components ...>
{
    using IBase = IBuilder<Base, Components ...>;
 
public:
    builder(flecs::world_t *world)
        : IBase(&m_desc)
        , m_desc{}
        , m_world(world) { }
 
    builder(const builder& f) 
        : IBase(&m_desc, f.m_term_index)
    {
        m_world = f.m_world;
        m_desc = f.m_desc;
    }
 
    builder(builder&& f)  noexcept
        : builder<T, TDesc, Base, IBuilder, Components...>(f) { }
 
    operator TDesc*() {
        return &m_desc;
    }
 
    T<Components ...> build() {
        return T<Components...>(m_world, *static_cast<Base*>(this));
    }
 
protected:
    flecs::world_t* world_v() override { return m_world; }
    TDesc m_desc;
    flecs::world_t *m_world;
};
 
#undef FLECS_TBUILDER
#undef FLECS_IBUILDER
 
} // namespace _
} // namespace flecs