TypeKeyedMap.h

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// Copyright 2015 Sensics, Inc.
//
// 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)
//
// Project home: https://github.com/ericniebler/meta
//

#ifndef INCLUDED_TypeKeyedMap_h_GUID_29C6B905_4493_43AF_A811_71589CFD6FBC
#define INCLUDED_TypeKeyedMap_h_GUID_29C6B905_4493_43AF_A811_71589CFD6FBC

// Internal Includes
#include "TypeKeyed.h"
#include "Contains.h"
#include "Length.h"

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

// Standard includes
#include <array>

namespace osvr {
namespace typepack {
    template <typename KeyList, typename ValueType>
    class TypeKeyedMap
        : public TypeKeyedBase<TypeKeyedMap<KeyList, ValueType>> {
        using size_constant = length<KeyList>;

      public:
        using key_types = KeyList;
        using value_type = ValueType;

      private:
        template <typename, typename>
        friend struct typekeyed_detail::ValueAccessor;
        using container_type = std::array<value_type, size_constant::value>;
        container_type &nested_container() { return container_; }
        container_type const &nested_container() const { return container_; }

      private:
        container_type container_;
    };

    // Required traits
    namespace typekeyed_detail {
        template <typename KeyList, typename ValueType, typename Key>
        struct ValueTypeAtKeyTraits<TypeKeyedMap<KeyList, ValueType>, Key> {
            using type = ValueType;
        };

    } // namespace typekeyed_detail
} // namespace typepack
} // namespace osvr

#endif // INCLUDED_TypeKeyedMap_h_GUID_29C6B905_4493_43AF_A811_71589CFD6FBC