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
21namespace 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
42namespace 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
62