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_CONSTRUCTIBLE_HPP_INCLUDED
12#define BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED
13
14#include <boost/config.hpp>
15#include <boost/type_traits/intrinsics.hpp>
16#include <boost/type_traits/integral_constant.hpp>
17#include <boost/detail/workaround.hpp>
18
19#ifdef BOOST_IS_NOTHROW_MOVE_CONSTRUCT
20
21namespace boost {
22
23template <class T>
24struct is_nothrow_move_constructible : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_CONSTRUCT(T)>{};
25
26template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
27template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
28
29#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
30
31#include <boost/type_traits/declval.hpp>
32#include <boost/utility/enable_if.hpp>
33
34namespace boost{ namespace detail{
35
36template <class T, class Enable = void>
37struct false_or_cpp11_noexcept_move_constructible: public ::boost::false_type {};
38
39template <class T>
40struct false_or_cpp11_noexcept_move_constructible <
41 T,
42 typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>::type
43 > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>
44{};
45
46}
47
48template <class T> struct is_nothrow_move_constructible
49 : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_constructible<T>::value>{};
50
51template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
52template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
53template <class T, std::size_t N> struct is_nothrow_move_constructible<T[N]> : public ::boost::false_type{};
54template <class T> struct is_nothrow_move_constructible<T[]> : public ::boost::false_type{};
55
56#else
57
58#include <boost/type_traits/has_trivial_move_constructor.hpp>
59#include <boost/type_traits/has_nothrow_copy.hpp>
60#include <boost/type_traits/is_array.hpp>
61
62namespace boost{
63
64template <class T>
65struct is_nothrow_move_constructible
66 : public integral_constant<bool,
67 (::boost::has_trivial_move_constructor<T>::value || ::boost::has_nothrow_copy<T>::value) && !::boost::is_array<T>::value>
68{};
69
70#endif
71
72template <> struct is_nothrow_move_constructible<void> : false_type{};
73#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
74template <> struct is_nothrow_move_constructible<void const> : false_type{};
75template <> struct is_nothrow_move_constructible<void volatile> : false_type{};
76template <> struct is_nothrow_move_constructible<void const volatile> : false_type{};
77#endif
78// References are always trivially constructible, even if the thing they reference is not:
79template <class T> struct is_nothrow_move_constructible<T&> : public ::boost::true_type{};
80#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
81template <class T> struct is_nothrow_move_constructible<T&&> : public ::boost::true_type{};
82#endif
83
84} // namespace boost
85
86#endif // BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED
87