85 lines
3.8 KiB
Plaintext
85 lines
3.8 KiB
Plaintext
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// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (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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//
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// See http://www.boost.org/libs/type_traits for most recent version including documentation.
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#ifndef BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED
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#define BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED
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#include <cstddef> // size_t
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/type_traits/intrinsics.hpp>
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#if !defined(BOOST_HAS_NOTHROW_ASSIGN) || defined(BOOST_MSVC) || defined(BOOST_INTEL)
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#include <boost/type_traits/has_trivial_assign.hpp>
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#if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#include <boost/type_traits/declval.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_volatile.hpp>
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#include <boost/type_traits/is_reference.hpp>
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#include <boost/type_traits/is_assignable.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#endif
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#endif
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#if defined(__GNUC__) || defined(__SUNPRO_CC) || defined(__clang__)
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_volatile.hpp>
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#include <boost/type_traits/is_assignable.hpp>
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#include <boost/type_traits/is_array.hpp>
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#ifdef BOOST_INTEL
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#include <boost/type_traits/is_pod.hpp>
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#endif
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#endif
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namespace boost {
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#if !defined(BOOST_HAS_NOTHROW_ASSIGN) && !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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namespace detail
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{
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template <class T, bool b1, bool b2> struct has_nothrow_assign_imp{ static const bool value = false; };
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template <class T> struct has_nothrow_assign_imp<T, false, true>{ static const bool value = noexcept(boost::declval<typename add_reference<T>::type>() = boost::declval<typename add_reference<T const>::type>()); };
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template <class T, std::size_t N> struct has_nothrow_assign_imp<T[N], false, true>{ static const bool value = has_nothrow_assign_imp<T, false, true>::value; };
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template <class T> struct has_nothrow_assign_imp<T[], false, true>{ static const bool value = has_nothrow_assign_imp<T, false, true>::value; };
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}
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#endif
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template <class T>
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struct has_nothrow_assign : public integral_constant < bool,
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#ifndef BOOST_HAS_NOTHROW_ASSIGN
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#if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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// Portable C++11 version:
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detail::has_nothrow_assign_imp<T,
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(is_const<typename remove_reference<T>::type>::value || is_volatile<typename remove_reference<T>::type>::value || is_reference<T>::value),
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is_assignable<typename add_reference<T>::type, typename add_reference<const T>::type>::value
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>::value
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#else
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::boost::has_trivial_assign<T>::value
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#endif
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#else
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BOOST_HAS_NOTHROW_ASSIGN(T)
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#endif
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> {};
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template <class T, std::size_t N> struct has_nothrow_assign <T[N]> : public has_nothrow_assign<T> {};
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template <> struct has_nothrow_assign<void> : public false_type{};
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template <class T> struct has_nothrow_assign<T volatile> : public false_type{};
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template <class T> struct has_nothrow_assign<T&> : public false_type{};
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template <class T> struct has_nothrow_assign<T&&> : public false_type{};
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#endif
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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template <> struct has_nothrow_assign<void const> : public false_type{};
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template <> struct has_nothrow_assign<void const volatile> : public false_type{};
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template <> struct has_nothrow_assign<void volatile> : public false_type{};
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#endif
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} // namespace boost
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#endif // BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED
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