// (C) Copyright Gennadiy Rozental 2001.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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/// @file
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/// Defines c++14 index_sequence implementation
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// ***************************************************************************
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#ifndef BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
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#define BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
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// Boost.Test
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#include <boost/test/data/config.hpp>
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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namespace boost {
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namespace unit_test {
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namespace data {
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// ************************************************************************** //
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// ************** data::index_sequence ************** //
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// ************************************************************************** //
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template <std::size_t... Ns>
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struct index_sequence {};
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template<typename IS1, typename IS2>
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struct merge_index_sequence;
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template <std::size_t... Ns1, std::size_t... Ns2>
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struct merge_index_sequence<index_sequence<Ns1...>, index_sequence<Ns2...>> {
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typedef index_sequence<Ns1..., Ns2...> type;
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};
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template <std::size_t B, std::size_t E, typename Enabler = void>
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struct make_index_sequence {
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typedef typename merge_index_sequence<typename make_index_sequence<B,(B+E)/2>::type,
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typename make_index_sequence<(B+E)/2,E>::type>::type type;
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};
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template <std::size_t B, std::size_t E>
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struct make_index_sequence<B,E,typename std::enable_if<E==B+1,void>::type> {
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typedef index_sequence<B> type;
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};
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template <>
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struct make_index_sequence<0, 0> {
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typedef index_sequence<> type;
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};
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template <typename... T>
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using index_sequence_for = typename make_index_sequence<0, sizeof...(T)>::type;
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} // namespace data
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} // namespace unit_test
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} // namespace boost
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_DATA_INDEX_SEQUENCE_HPP
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