ceph/src/boost/boost/type_traits/is_nothrow_move_constructible.hpp

   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
  22 namespace boost {
  23
  24 template <class T>
  25 struct is_nothrow_move_constructible : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_CONSTRUCT(T)>{};
  26
  27 template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
  28 template <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
  35 namespace boost{ namespace detail{
  36
  37 template <class T, class Enable = void>
  38 struct false_or_cpp11_noexcept_move_constructible: public ::boost::false_type {};
  39
  40 template <class T>
  41 struct 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
  49 template <class T> struct is_nothrow_move_constructible
  50    : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_constructible<T>::value>{};
  51
  52 template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
  53 template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
  54 template <class T, std::size_t N> struct is_nothrow_move_constructible<T[N]> : public ::boost::false_type{};
  55 template <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
  63 namespace boost{
  64
  65 template <class T>
  66 struct 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
  73 template <> struct is_nothrow_move_constructible<void> : false_type{};
  74 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  75 template <> struct is_nothrow_move_constructible<void const> : false_type{};
  76 template <> struct is_nothrow_move_constructible<void volatile> : false_type{};
  77 template <> 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:
  80 template <class T> struct is_nothrow_move_constructible<T&> : public ::boost::true_type{};
  81 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  82 template <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