EntityComponentMetaSystem/src/EC/Meta/Combine.hpp

// This work derives from Vittorio Romeo's code used for cppcon 2015 licensed under the Academic Free License.
// His code is available here: https://github.com/SuperV1234/cppcon2015


#ifndef EC_META_COMBINE_HPP
#define EC_META_COMBINE_HPP

#include "TypeList.hpp"

namespace EC
{
    namespace Meta
    {
        template <typename TTypeListA, typename TTypeListB>
        struct CombineHelper
        {
            using type = TypeList<>;
        };

        template <template <typename...> class TTypeListA, template <typename...> class TTypeListB, typename... TypesA, typename... TypesB>
        struct CombineHelper<TTypeListA<TypesA...>, TTypeListB<TypesB...> >
        {
            using type = TypeList<TypesA..., TypesB...>;
        };

        template <typename TTypeListA, typename TTypeListB>
        using Combine = typename CombineHelper<TTypeListA, TTypeListB>::type;
    }
}

#endif