1 | |
2 | // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. |
3 | // (C) Copyright Eric Friedman 2002-2003. |
4 | // (C) Copyright Antony Polukhin 2013. |
5 | // Use, modification and distribution are subject to the Boost Software License, |
6 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
7 | // http://www.boost.org/LICENSE_1_0.txt). |
8 | // |
9 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
10 | |
11 | #ifndef BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED |
12 | #define BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED |
13 | |
14 | #include <boost/config.hpp> |
15 | #include <boost/type_traits/has_trivial_move_assign.hpp> |
16 | #include <boost/type_traits/has_nothrow_assign.hpp> |
17 | #include <boost/type_traits/is_array.hpp> |
18 | #include <boost/type_traits/is_reference.hpp> |
19 | #include <boost/utility/enable_if.hpp> |
20 | #include <boost/type_traits/declval.hpp> |
21 | |
22 | namespace boost { |
23 | |
24 | #ifdef BOOST_IS_NOTHROW_MOVE_ASSIGN |
25 | |
26 | template <class T> |
27 | struct is_nothrow_move_assignable : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_ASSIGN(T)>{}; |
28 | template <class T> struct is_nothrow_move_assignable<T const> : public false_type{}; |
29 | template <class T> struct is_nothrow_move_assignable<T volatile> : public false_type{}; |
30 | template <class T> struct is_nothrow_move_assignable<T const volatile> : public false_type{}; |
31 | template <class T> struct is_nothrow_move_assignable<T&> : public false_type{}; |
32 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
33 | template <class T> struct is_nothrow_move_assignable<T&&> : public false_type{}; |
34 | #endif |
35 | |
36 | #elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) |
37 | |
38 | namespace detail{ |
39 | |
40 | template <class T, class Enable = void> |
41 | struct false_or_cpp11_noexcept_move_assignable: public ::boost::false_type {}; |
42 | |
43 | template <class T> |
44 | struct false_or_cpp11_noexcept_move_assignable < |
45 | T, |
46 | typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())>::type |
47 | > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())> |
48 | {}; |
49 | |
50 | } |
51 | |
52 | template <class T> |
53 | struct is_nothrow_move_assignable : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_assignable<T>::value>{}; |
54 | |
55 | template <class T> struct is_nothrow_move_assignable<T const> : public ::boost::false_type {}; |
56 | template <class T> struct is_nothrow_move_assignable<T const volatile> : public ::boost::false_type{}; |
57 | template <class T> struct is_nothrow_move_assignable<T volatile> : public ::boost::false_type{}; |
58 | template <class T> struct is_nothrow_move_assignable<T&> : public ::boost::false_type{}; |
59 | #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES |
60 | template <class T> struct is_nothrow_move_assignable<T&&> : public ::boost::false_type{}; |
61 | #endif |
62 | |
63 | #else |
64 | |
65 | template <class T> |
66 | struct is_nothrow_move_assignable : public integral_constant<bool, |
67 | (::boost::has_trivial_move_assign<T>::value || ::boost::has_nothrow_assign<T>::value) && ! ::boost::is_array<T>::value>{}; |
68 | |
69 | #endif |
70 | |
71 | |
72 | template <> struct is_nothrow_move_assignable<void> : public false_type{}; |
73 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
74 | template <> struct is_nothrow_move_assignable<void const> : public false_type{}; |
75 | template <> struct is_nothrow_move_assignable<void const volatile> : public false_type{}; |
76 | template <> struct is_nothrow_move_assignable<void volatile> : public false_type{}; |
77 | #endif |
78 | |
79 | } // namespace boost |
80 | |
81 | #endif // BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED |
82 | |