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 <cstddef> // size_t
15#include <boost/config.hpp>
16#include <boost/type_traits/intrinsics.hpp>
17#include <boost/type_traits/integral_constant.hpp>
18#include <boost/detail/workaround.hpp>
19
20#ifdef BOOST_IS_NOTHROW_MOVE_CONSTRUCT
21
22namespace boost {
23
24template <class T>
25struct is_nothrow_move_constructible : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_CONSTRUCT(T)>{};
26
27template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
28template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
29
30#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40800)
31
32#include <boost/type_traits/declval.hpp>
33#include <boost/utility/enable_if.hpp>
34
35namespace boost{ namespace detail{
36
37template <class T, class Enable = void>
38struct false_or_cpp11_noexcept_move_constructible: public ::boost::false_type {};
39
40template <class T>
41struct false_or_cpp11_noexcept_move_constructible <
42 T,
43 typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>::type
44 > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>
45{};
46
47}
48
49template <class T> struct is_nothrow_move_constructible
50 : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_constructible<T>::value>{};
51
52template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
53template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
54template <class T, std::size_t N> struct is_nothrow_move_constructible<T[N]> : public ::boost::false_type{};
55template <class T> struct is_nothrow_move_constructible<T[]> : public ::boost::false_type{};
56
57#else
58
59#include <boost/type_traits/has_trivial_move_constructor.hpp>
60#include <boost/type_traits/has_nothrow_copy.hpp>
61#include <boost/type_traits/is_array.hpp>
62
63namespace boost{
64
65template <class T>
66struct is_nothrow_move_constructible
67 : public integral_constant<bool,
68 (::boost::has_trivial_move_constructor<T>::value || ::boost::has_nothrow_copy<T>::value) && !::boost::is_array<T>::value>
69{};
70
71#endif
72
73template <> struct is_nothrow_move_constructible<void> : false_type{};
74#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
75template <> struct is_nothrow_move_constructible<void const> : false_type{};
76template <> struct is_nothrow_move_constructible<void volatile> : false_type{};
77template <> struct is_nothrow_move_constructible<void const volatile> : false_type{};
78#endif
79// References are always trivially constructible, even if the thing they reference is not:
80template <class T> struct is_nothrow_move_constructible<T&> : public ::boost::true_type{};
81#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
82template <class T> struct is_nothrow_move_constructible<T&&> : public ::boost::true_type{};
83#endif
84
85} // namespace boost
86
87#endif // BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED
88