boost/type_traits/is_nothrow_move_assignable.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_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/type_traits/detail/ice_and.hpp>
  20 #include <boost/type_traits/detail/ice_or.hpp>
  21 #include <boost/type_traits/detail/ice_not.hpp>
  22 #include <boost/utility/enable_if.hpp>
  23 #include <boost/utility/declval.hpp>
  24
  25 // should be the last #include
  26 #include <boost/type_traits/detail/bool_trait_def.hpp>
  27
  28 namespace boost {
  29
  30 namespace detail{
  31
  32 #ifndef BOOST_NO_CXX11_NOEXCEPT
  33
  34 template <class T, class Enable = void>
  35 struct false_or_cpp11_noexcept_move_assignable: public ::boost::false_type {};
  36
  37 template <class T>
  38 struct false_or_cpp11_noexcept_move_assignable <
  39         T,
  40         typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())>::type
  41     > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())>
  42 {};
  43
  44 template <class T>
  45 struct is_nothrow_move_assignable_imp{
  46     BOOST_STATIC_CONSTANT(bool, value = (
  47         ::boost::type_traits::ice_and<
  48             ::boost::type_traits::ice_not< ::boost::is_volatile<T>::value >::value,
  49             ::boost::type_traits::ice_not< ::boost::is_reference<T>::value >::value,
  50             ::boost::detail::false_or_cpp11_noexcept_move_assignable<T>::value
  51         >::value));
  52 };
  53
  54 #else
  55
  56 template <class T>
  57 struct is_nothrow_move_assignable_imp{
  58     BOOST_STATIC_CONSTANT(bool, value = (
  59         ::boost::type_traits::ice_and<
  60             ::boost::type_traits::ice_or<
  61                 ::boost::has_trivial_move_assign<T>::value,
  62                 ::boost::has_nothrow_assign<T>::value
  63             >::value,
  64             ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value
  65         >::value));
  66 };
  67
  68 #endif
  69
  70 }
  71
  72 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_nothrow_move_assignable,T,::boost::detail::is_nothrow_move_assignable_imp<T>::value)
  73 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_nothrow_move_assignable,void,false)
  74 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  75 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_nothrow_move_assignable,void const,false)
  76 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_nothrow_move_assignable,void const volatile,false)
  77 BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_nothrow_move_assignable,void volatile,false)
  78 #endif
  79
  80 } // namespace boost
  81
  82 #include <boost/type_traits/detail/bool_trait_undef.hpp>
  83
  84 #endif // BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED