multiple_inheritance2.hpp

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#ifndef BOOST_MPL11_DETAIL_AT_INDEX_MULTIPLE_INHERITANCE2_HPP
#define BOOST_MPL11_DETAIL_AT_INDEX_MULTIPLE_INHERITANCE2_HPP

#include <boost/mpl11/detail/std_index_sequence.hpp>
#include <boost/mpl11/detail/std_size_t.hpp>


namespace boost { namespace mpl11 { namespace detail { namespace at_index {
    template <std_size_t n, std_size_t index, typename ...xs>
    struct select { };

    template <std_size_t n, typename ...xs>
    struct select<n, n, xs...> : xs... { };

    template <std_size_t n, typename indices, typename ...xs>
    struct m2_indexer_impl;

    template <std_size_t n, std_size_t ...index, typename ...xs>
    struct m2_indexer_impl<n, std_index_sequence<index...>, xs...>
        : select<n, index, xs>...
    { };

    template <std_size_t n, typename ...xs>
    using multiple_inheritance2 = m2_indexer_impl<
        n, typename make_std_index_sequence<sizeof...(xs)>::type, xs...
    >;
}}}} // end namespace boost::mpl11::detail::at_index

#endif // !BOOST_MPL11_DETAIL_AT_INDEX_MULTIPLE_INHERITANCE2_HPP