SplitList.h

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// Copyright 2015 Sensics, Inc.
// TypePack is part of OSVR-Core.
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef INCLUDED_SplitList_h_GUID_471C8D69_CFAD_4083_5485_5DE0EAA24C7F
#define INCLUDED_SplitList_h_GUID_471C8D69_CFAD_4083_5485_5DE0EAA24C7F

// Internal Includes
#include "List.h"

// Library/third-party includes
// - none

// Standard includes
// - none

namespace osvr {
namespace typepack {
    namespace detail {
        template <typename... List> struct split_list_ {
            using head = void;
            using tail = list<>;
        };

        template <typename... List>
        struct split_list_<list<List...>> : split_list_<List...> {};

        template <typename Head, typename... Tail>
        struct split_list_<Head, Tail...> {
            using head = Head;
            using tail = list<Tail...>;
        };
    } // namespace detail

    template <typename... List>
    using head = typename detail::split_list_<List...>::head;

    template <typename... List>
    using tail = typename detail::split_list_<List...>::tail;
} // namespace typepack
} // namespace osvr
#endif // INCLUDED_SplitList_h_GUID_471C8D69_CFAD_4083_5485_5DE0EAA24C7F