68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
|
#ifndef BOOST_TYPE_TRAITS_IS_NOTHROW_SWAPPABLE_HPP_INCLUDED
|
||
|
#define BOOST_TYPE_TRAITS_IS_NOTHROW_SWAPPABLE_HPP_INCLUDED
|
||
|
|
||
|
// Copyright 2017 Peter Dimov
|
||
|
//
|
||
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
// See accompanying file LICENSE_1_0.txt or copy at
|
||
|
// http://www.boost.org/LICENSE_1_0.txt
|
||
|
|
||
|
#include <boost/config.hpp>
|
||
|
#include <boost/config/workaround.hpp>
|
||
|
|
||
|
#if defined(BOOST_NO_SFINAE_EXPR) || defined(BOOST_NO_CXX11_NOEXCEPT) || defined(BOOST_NO_CXX11_DECLTYPE) \
|
||
|
|| defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) || BOOST_WORKAROUND(BOOST_GCC, < 40700)
|
||
|
|
||
|
#include <boost/type_traits/is_scalar.hpp>
|
||
|
#include <boost/type_traits/is_const.hpp>
|
||
|
#include <boost/type_traits/integral_constant.hpp>
|
||
|
|
||
|
namespace boost
|
||
|
{
|
||
|
template <class T> struct is_nothrow_swappable : boost::integral_constant<bool,
|
||
|
boost::is_scalar<T>::value && !boost::is_const<T>::value> {};
|
||
|
|
||
|
template <class T, class U> struct is_nothrow_swappable_with : false_type {};
|
||
|
template <class T> struct is_nothrow_swappable_with<T, T> : is_nothrow_swappable<T> {};
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
|
||
|
#include <boost/type_traits/declval.hpp>
|
||
|
#include <boost/type_traits/integral_constant.hpp>
|
||
|
#include <algorithm>
|
||
|
|
||
|
namespace boost
|
||
|
{
|
||
|
|
||
|
namespace type_traits_swappable_detail
|
||
|
{
|
||
|
|
||
|
using std::swap;
|
||
|
|
||
|
template<class T, class U, bool B = noexcept(swap(declval<T>(), declval<U>()))> integral_constant<bool, B> is_nothrow_swappable_with_impl( int );
|
||
|
template<class T, class U> false_type is_nothrow_swappable_with_impl( ... );
|
||
|
template<class T, class U>
|
||
|
struct is_nothrow_swappable_with_helper { typedef decltype( type_traits_swappable_detail::is_nothrow_swappable_with_impl<T, U>(0) ) type; };
|
||
|
|
||
|
template<class T, bool B = noexcept(swap(declval<T&>(), declval<T&>()))> integral_constant<bool, B> is_nothrow_swappable_impl( int );
|
||
|
template<class T> false_type is_nothrow_swappable_impl( ... );
|
||
|
template<class T>
|
||
|
struct is_nothrow_swappable_helper { typedef decltype( type_traits_swappable_detail::is_nothrow_swappable_impl<T>(0) ) type; };
|
||
|
|
||
|
} // namespace type_traits_swappable_detail
|
||
|
|
||
|
template<class T, class U> struct is_nothrow_swappable_with: type_traits_swappable_detail::is_nothrow_swappable_with_helper<T, U>::type
|
||
|
{
|
||
|
};
|
||
|
|
||
|
template<class T> struct is_nothrow_swappable: type_traits_swappable_detail::is_nothrow_swappable_helper<T>::type
|
||
|
{
|
||
|
};
|
||
|
|
||
|
} // namespace boost
|
||
|
|
||
|
#endif
|
||
|
|
||
|
#endif // #ifndef BOOST_TYPE_TRAITS_IS_NOTHROW_SWAPPABLE_HPP_INCLUDED
|