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Merge pull request #40 from boostorg/feature/is_nothrow_swappable

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Add is_nothrow_swappable
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jzmaddock
2017-07-16 19:02:45 +01:00
committed by GitHub
parent 7af1f795c1 b47d4aa421
commit 847b2b3b06
5 changed files with 198 additions and 0 deletions
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doc/is_nothrow_swappable.qbk Normal file
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[/
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).
]
[section:is_nothrow_swappable is_nothrow_swappable]
template <class T>
struct is_nothrow_swappable : public __tof {};
__inherit If the expression `swap(declval<T&>(), declval<T&>())` (in a context
where `std::swap` is visible) is valid and non-throwing, inherits from
__true_type, otherwise from __false_type.
__compat This trait requires C++11.
__header ` #include <boost/type_traits/is_nothrow_swappable.hpp>` or ` #include <boost/type_traits.hpp>`
[endsect]

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doc/type_traits.qbk
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@ -100,6 +100,7 @@
[def __is_nothrow_move_constructible [link boost_typetraits.reference.is_nothrow_move_constructible is_nothrow_move_constructible]]
[def __has_nothrow_assign [link boost_typetraits.reference.has_nothrow_assign has_nothrow_assign]]
[def __is_nothrow_move_assignable [link boost_typetraits.reference.is_nothrow_move_assignable is_nothrow_move_assignable]]
[def __is_nothrow_swappable [link boost_typetraits.reference.is_nothrow_swappable is_nothrow_swappable]]
[def __is_base_of [link boost_typetraits.reference.is_base_of is_base_of]]
[def __is_virtual_base_of [link boost_typetraits.reference.is_virtual_base_of is_virtual_base_of]]
@ -300,6 +301,7 @@ See __has_trivial_constructor.
[include is_member_pointer.qbk]
[include is_nothrow_move_assignable.qbk]
[include is_nothrow_move_constructible.qbk]
[include is_nothrow_swappable.qbk]
[include is_object.qbk]
[include is_pod.qbk]
[include is_pointer.qbk]

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include/boost/type_traits.hpp
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@ -113,6 +113,7 @@
#include <boost/type_traits/is_member_pointer.hpp>
#include <boost/type_traits/is_nothrow_move_assignable.hpp>
#include <boost/type_traits/is_nothrow_move_constructible.hpp>
#include <boost/type_traits/is_nothrow_swappable.hpp>
#include <boost/type_traits/is_object.hpp>
#include <boost/type_traits/is_pod.hpp>
#include <boost/type_traits/is_pointer.hpp>

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include/boost/type_traits/is_nothrow_swappable.hpp Normal file
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#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>
#if defined(BOOST_NO_SFINAE_EXPR) || defined(BOOST_NO_CXX11_NOEXCEPT) || defined(BOOST_NO_CXX11_DECLTYPE) || defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS)
#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, 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( ... );
} // namespace type_traits_swappable_detail
template<class T, class U> struct is_nothrow_swappable_with: decltype( type_traits_swappable_detail::is_nothrow_swappable_with_impl<T, U>(0) )
{
};
template<class T> struct is_nothrow_swappable: decltype( type_traits_swappable_detail::is_nothrow_swappable_impl<T>(0) )
{
};
} // namespace boost
#endif
#endif // #ifndef BOOST_TYPE_TRAITS_IS_NOTHROW_SWAPPABLE_HPP_INCLUDED

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test/is_nothrow_swappable_test.cpp Normal file
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// 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
#ifdef TEST_STD
# include <type_traits>
#else
# include <boost/type_traits/is_nothrow_swappable.hpp>
#endif
#include <boost/config.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) \
|| (defined(__GLIBCXX__) && __GLIBCXX__ <= 20120301) // built-in clang++ -std=c++11 on Travis, w/ libstdc++ 4.6
int main()
{
}
#else
#include "test.hpp"
#include "check_integral_constant.hpp"
#include <utility>
struct X
{
};
struct Y
{
Y( Y const& ) {}
};
struct Z
{
Z& operator=( Z const& ) { return *this; }
};
struct V
{
V( V const& ) {}
V& operator=( V const& ) { return *this; }
};
void swap( V&, V& ) noexcept {}
TT_TEST_BEGIN(is_nothrow_swappable)
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int volatile>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int[2]>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int const[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int volatile[2]>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<int const volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<void>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<void const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<void volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<void const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X[2]>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X const[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<X const volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y const[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Y const volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z const[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<Z const volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V const>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V const volatile>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V[2]>::value, true);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V const[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_nothrow_swappable<V const volatile[2]>::value, false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<X, int> >::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<X, int> const>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<X, int> volatile>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<X, int> const volatile>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<Y, int> >::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<Y, int> const>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<Y, int> volatile>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<Y, int> const volatile>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<V, int> >::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<V, int> const>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<V, int> volatile>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_nothrow_swappable<std::pair<V, int> const volatile>::value), false);
TT_TEST_END
#endif