forked from boostorg/mp11
48 lines
1.0 KiB
C++
48 lines
1.0 KiB
C++
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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/tuple_for_each.hpp>
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#include <boost/config.hpp>
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// Technically std::tuple isn't constexpr enabled in C++11, but it works with libstdc++
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#if defined( BOOST_NO_CXX11_CONSTEXPR ) || ( defined( _LIBCPP_VERSION ) && __cplusplus < 201400L )
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int main() {}
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#else
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#include <tuple>
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#include <type_traits>
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struct assert_is_integral
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{
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template<class T> constexpr bool operator()( T ) const
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{
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static_assert( std::is_integral<T>::value, "T must be an integral type" );
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return true;
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}
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};
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int main()
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{
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{
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constexpr std::tuple<int, short, char> tp{ 1, 2, 3 };
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constexpr auto r = boost::tuple_for_each( tp, assert_is_integral() );
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(void)r;
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}
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{
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constexpr std::tuple<> tp;
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constexpr auto r = boost::tuple_for_each( tp, 11 );
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static_assert( r == 11, "r == 11" );
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}
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}
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#endif
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