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#include <boost/type_traits/is_complete.hpp>
16#include <boost/static_assert.hpp>
17
18#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
19
20#include <boost/type_traits/detail/yes_no_type.hpp>
21#include <boost/type_traits/declval.hpp>
22
23namespace boost{
24
25 namespace detail{
26
27 struct is_destructible_imp
28 {
29 template<typename T, typename = decltype(boost::declval<T&>().~T())>
30 static boost::type_traits::yes_type test(int);
31 template<typename>
32 static boost::type_traits::no_type test(...);
33 };
34
35 }
36
37 template <class T> struct is_destructible : public integral_constant<bool, sizeof(boost::detail::is_destructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>
38 {
39 BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_destructible must be complete types");
40 };
41
42#else
43
44#include <boost/type_traits/is_pod.hpp>
45#include <boost/type_traits/is_class.hpp>
46
47namespace boost{
48
49 // We don't know how to implement this:
50 template <class T> struct is_destructible : public integral_constant<bool, is_pod<T>::value || is_class<T>::value>
51 {
52 BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_destructible must be complete types");
53 };
54#endif
55
56 template <> struct is_destructible<void> : public false_type{};
57 template <> struct is_destructible<void const> : public false_type{};
58 template <> struct is_destructible<void volatile> : public false_type{};
59 template <> struct is_destructible<void const volatile> : public false_type{};
60 template <class T> struct is_destructible<T&> : public is_destructible<T>{};
61#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
62 template <class T> struct is_destructible<T&&> : public is_destructible<T>{};
63#endif
64 template <class T, std::size_t N> struct is_destructible<T[N]> : public is_destructible<T>{};
65 template <class T> struct is_destructible<T[]> : public is_destructible<T>{};
66
67} // namespace boost
68
69#endif // BOOST_TT_IS_DESTRUCTIBLE_HPP_INCLUDED
70

source code of include/boost/type_traits/is_destructible.hpp