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2 | // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. | |
3 | // Use, modification and distribution are subject to the Boost Software License, | |
4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt). | |
6 | // | |
7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. | |
8 | ||
9 | #ifndef BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED | |
10 | #define BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED | |
11 | ||
12 | #include <cstddef> // size_t | |
13 | #include <boost/type_traits/integral_constant.hpp> | |
14 | #include <boost/type_traits/intrinsics.hpp> | |
15 | ||
16 | #if !defined(BOOST_HAS_NOTHROW_ASSIGN) || defined(BOOST_MSVC) || defined(BOOST_INTEL) | |
17 | #include <boost/type_traits/has_trivial_assign.hpp> | |
18 | #if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
19 | #include <boost/type_traits/declval.hpp> | |
20 | #include <boost/type_traits/is_const.hpp> | |
21 | #include <boost/type_traits/is_volatile.hpp> | |
22 | #include <boost/type_traits/is_reference.hpp> | |
23 | #include <boost/type_traits/is_assignable.hpp> | |
24 | #include <boost/type_traits/add_reference.hpp> | |
25 | #include <boost/type_traits/remove_reference.hpp> | |
26 | #endif | |
27 | #endif | |
28 | #if defined(__GNUC__) || defined(__SUNPRO_CC) || defined(__clang__) | |
29 | #include <boost/type_traits/is_const.hpp> | |
30 | #include <boost/type_traits/is_volatile.hpp> | |
31 | #include <boost/type_traits/is_assignable.hpp> | |
32 | #include <boost/type_traits/is_array.hpp> | |
33 | #ifdef BOOST_INTEL | |
34 | #include <boost/type_traits/is_pod.hpp> | |
35 | #endif | |
36 | #endif | |
37 | ||
38 | namespace boost { | |
39 | ||
40 | #if !defined(BOOST_HAS_NOTHROW_ASSIGN) && !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
41 | ||
42 | namespace detail | |
43 | { | |
44 | template <class T, bool b1, bool b2> struct has_nothrow_assign_imp{ static const bool value = false; }; | |
45 | 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>()); }; | |
46 | 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; }; | |
47 | template <class T> struct has_nothrow_assign_imp<T[], false, true>{ static const bool value = has_nothrow_assign_imp<T, false, true>::value; }; | |
48 | } | |
49 | ||
50 | #endif | |
51 | ||
52 | template <class T> | |
53 | struct has_nothrow_assign : public integral_constant < bool, | |
54 | #ifndef BOOST_HAS_NOTHROW_ASSIGN | |
55 | #if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
56 | // Portable C++11 version: | |
57 | detail::has_nothrow_assign_imp<T, | |
58 | (is_const<typename remove_reference<T>::type>::value || is_volatile<typename remove_reference<T>::type>::value || is_reference<T>::value), | |
59 | is_assignable<typename add_reference<T>::type, typename add_reference<const T>::type>::value | |
60 | >::value | |
61 | #else | |
62 | ::boost::has_trivial_assign<T>::value | |
63 | #endif | |
64 | #else | |
65 | BOOST_HAS_NOTHROW_ASSIGN(T) | |
66 | #endif | |
67 | > {}; | |
68 | ||
69 | template <class T, std::size_t N> struct has_nothrow_assign <T[N]> : public has_nothrow_assign<T> {}; | |
70 | template <> struct has_nothrow_assign<void> : public false_type{}; | |
71 | template <class T> struct has_nothrow_assign<T volatile> : public false_type{}; | |
72 | template <class T> struct has_nothrow_assign<T&> : public false_type{}; | |
73 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
74 | template <class T> struct has_nothrow_assign<T&&> : public false_type{}; | |
75 | #endif | |
76 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS | |
77 | template <> struct has_nothrow_assign<void const> : public false_type{}; | |
78 | template <> struct has_nothrow_assign<void const volatile> : public false_type{}; | |
79 | template <> struct has_nothrow_assign<void volatile> : public false_type{}; | |
80 | #endif | |
81 | ||
82 | } // namespace boost | |
83 | ||
84 | #endif // BOOST_TT_HAS_NOTHROW_ASSIGN_HPP_INCLUDED |