ceph/src/boost/boost/type_traits/is_destructible.hpp

   1
   2 //  (C) Copyright John Maddock 2015.
   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_IS_DESTRUCTIBLE_HPP_INCLUDED
  10 #define BOOST_TT_IS_DESTRUCTIBLE_HPP_INCLUDED
  11
  12 #include <cstddef> // size_t
  13 #include <boost/type_traits/integral_constant.hpp>
  14 #include <boost/detail/workaround.hpp>
  15
  16 #if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
  17
  18 #include <boost/type_traits/detail/yes_no_type.hpp>
  19 #include <boost/type_traits/declval.hpp>
  20
  21 namespace boost{
  22
  23    namespace detail{
  24
  25       struct is_destructible_imp
  26       {
  27          template<typename T, typename = decltype(boost::declval<T&>().~T())>
  28          static boost::type_traits::yes_type test(int);
  29          template<typename>
  30          static boost::type_traits::no_type test(...);
  31       };
  32
  33    }
  34
  35    template <class T> struct is_destructible : public integral_constant<bool, sizeof(detail::is_destructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>{};
  36
  37 #else
  38
  39 #include <boost/type_traits/is_pod.hpp>
  40 #include <boost/type_traits/is_class.hpp>
  41
  42 namespace boost{
  43
  44    // We don't know how to implement this:
  45    template <class T> struct is_destructible : public integral_constant<bool, is_pod<T>::value || is_class<T>::value>{};
  46 #endif
  47
  48    template <> struct is_destructible<void> : public false_type{};
  49    template <> struct is_destructible<void const> : public false_type{};
  50    template <> struct is_destructible<void volatile> : public false_type{};
  51    template <> struct is_destructible<void const volatile> : public false_type{};
  52    template <class T> struct is_destructible<T&> : public is_destructible<T>{};
  53 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  54    template <class T> struct is_destructible<T&&> : public is_destructible<T>{};
  55 #endif
  56    template <class T, std::size_t N> struct is_destructible<T[N]> : public is_destructible<T>{};
  57    template <class T> struct is_destructible<T[]> : public is_destructible<T>{};
  58
  59 } // namespace boost
  60
  61 #endif // BOOST_TT_IS_DESTRUCTIBLE_HPP_INCLUDED