73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
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// Copyright Oliver Kowalke 2014.
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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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#ifndef BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H
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#define BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/context/detail/config.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace context {
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namespace detail {
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#if ! defined(BOOST_CONTEXT_NO_CXX14_INTEGER_SEQUENCE)
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template< std::size_t ... I >
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using index_sequence = std::index_sequence< I ... >;
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template< std::size_t I >
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using make_index_sequence = std::make_index_sequence< I >;
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template< typename ... T >
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using index_sequence_for = std::index_sequence_for< T ... >;
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#else
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//http://stackoverflow.com/questions/17424477/implementation-c14-make-integer-sequence
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template< std::size_t ... I >
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struct index_sequence {
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using type = index_sequence;
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using value_type = std::size_t;
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static constexpr std::size_t size() {
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return sizeof ... (I);
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}
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};
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template< typename Seq1, typename Seq2 >
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struct concat_sequence;
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template< std::size_t ... I1, std::size_t ... I2 >
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struct concat_sequence< index_sequence< I1 ... >, index_sequence< I2 ... > > : public index_sequence< I1 ..., (sizeof ... (I1)+I2) ... > {
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};
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template< std::size_t I >
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struct make_index_sequence : public concat_sequence< typename make_index_sequence< I/2 >::type,
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typename make_index_sequence< I-I/2 >::type > {
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};
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template<>
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struct make_index_sequence< 0 > : public index_sequence<> {
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};
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template<>
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struct make_index_sequence< 1 > : public index_sequence< 0 > {
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};
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template< typename ... T >
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using index_sequence_for = make_index_sequence< sizeof ... (T) >;
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#endif
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}}}
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H
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