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1 | #ifndef BOOST_TYPE_TRAITS_IS_LIST_CONSTRUCTIBLE_HPP_INCLUDED |
| 2 | #define BOOST_TYPE_TRAITS_IS_LIST_CONSTRUCTIBLE_HPP_INCLUDED | |
| 3 | ||
| 4 | // Copyright 2017 Peter Dimov | |
| 5 | // | |
| 6 | // Distributed under the Boost Software License, Version 1.0. | |
| 7 | // See accompanying file LICENSE_1_0.txt or copy at | |
| 8 | // http://www.boost.org/LICENSE_1_0.txt | |
| 9 | ||
| 10 | #include <boost/config.hpp> | |
| 11 | #include <boost/config/workaround.hpp> | |
| 12 | #include <boost/type_traits/integral_constant.hpp> | |
| 13 | #include <boost/type_traits/declval.hpp> | |
| 14 | #include <boost/type_traits/is_complete.hpp> | |
| 15 | #include <boost/static_assert.hpp> | |
| 16 | ||
| 17 | namespace boost | |
| 18 | { | |
| 19 | ||
| 20 | #if defined(BOOST_NO_SFINAE_EXPR) || defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_NO_CXX11_DECLTYPE) \ | |
| 21 | || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) || defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)\ | |
| 22 | || BOOST_WORKAROUND(BOOST_GCC, < 40700) | |
| 23 | ||
| 24 | template<class T, class = void, class = void, class = void, class = void, class = void, class = void> struct is_list_constructible: false_type | |
| 25 | { | |
| 26 | BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_list_constructible must be complete types"); | |
| 27 | }; | |
| 28 | ||
| 29 | #else | |
| 30 | ||
| 31 | namespace type_traits_detail | |
| 32 | { | |
| 33 | ||
| 34 | template<class T, class... A, class = decltype( T{declval<A>()...} )> true_type is_list_constructible_impl( int ); | |
| 35 | template<class T, class... A> false_type is_list_constructible_impl( ... ); | |
| 36 | ||
| 37 | } // namespace type_traits_detail | |
| 38 | ||
| 39 | template<class T, class... A> struct is_list_constructible: decltype( type_traits_detail::is_list_constructible_impl<T, A...>(0) ) | |
| 40 | { | |
| 41 | BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_list_constructible must be complete types"); | |
| 42 | }; | |
| 43 | ||
| 44 | #endif | |
| 45 | ||
| 46 | } // namespace boost | |
| 47 | ||
| 48 | #endif // #ifndef BOOST_TYPE_TRAITS_IS_LIST_CONSTRUCTIBLE_HPP_INCLUDED |