forked from boostorg/mp11
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
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#ifndef BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
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#define BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
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// Copyright 2015 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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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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#include <boost/config.hpp>
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#include <type_traits>
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namespace boost
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{
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// mp_plus
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namespace detail
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{
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template<class... T> struct mp_plus_impl;
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#if defined( BOOST_NO_CXX11_CONSTEXPR )
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template<> struct mp_plus_impl<>
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{
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using type = std::integral_constant<int, 0>;
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};
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template<class T1, class... T> struct mp_plus_impl<T1, T...>
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{
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static const/*expr*/ auto _v = T1::value + mp_plus<T...>::value;
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using type = std::integral_constant< typename std::remove_const<decltype(_v)>::type, _v >;
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};
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template<class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class... T> struct mp_plus_impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>
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{
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static const/*expr*/ auto _v = T1::value + T2::value + T3::value + T4::value + T5::value + T6::value + T7::value + T8::value + T9::value + T10::value + mp_plus<T...>::value;
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using type = std::integral_constant< typename std::remove_const<decltype(_v)>::type, _v >;
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};
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#else
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constexpr int cx_plus()
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{
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return 0;
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}
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template<class T1, class... T> constexpr auto cx_plus( T1 t1, T... t ) -> decltype( t1 + cx_plus( t... ) )
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{
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return t1 + cx_plus( t... );
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}
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template<class... T> struct mp_plus_impl
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{
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static constexpr auto _v = cx_plus( T::value... );
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using type = std::integral_constant< typename std::remove_const<decltype(_v)>::type, _v >;
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};
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#endif
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} // namespace detail
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template<class... T> using mp_plus = typename detail::mp_plus_impl<T...>::type;
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} // namespace boost
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#endif // #ifndef BOOST_MP11_DETAIL_MP_PLUS_HPP_INCLUDED
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