1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/*
@Copyright Barrett Adair 2015-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_CLBL_TRTS_class_of_HPP
#define BOOST_CLBL_TRTS_class_of_HPP
#include <boost/callable_traits/detail/core.hpp>
namespace boost { namespace callable_traits {
//[ class_of_hpp
/*`
[section:ref_class_of class_of]
[heading Header]
``#include <boost/callable_traits/class_of.hpp>``
[heading Definition]
*/
template<typename T>
using class_of_t = //see below
//<-
detail::try_but_fail_if_invalid<
typename detail::traits<detail::shallow_decay<T>>::class_type,
type_is_not_a_member_pointer>;
namespace detail {
template<typename T, typename = std::false_type>
struct class_of_impl {};
template<typename T>
struct class_of_impl <T, typename std::is_same<
class_of_t<T>, detail::dummy>::type>
{
using type = class_of_t<T>;
};
}
//->
template<typename T>
struct class_of : detail::class_of_impl<T> {};
//<-
}} // namespace boost::callable_traits
//->
/*`
[heading Constraints]
* `T` must be a member pointer
[heading Behavior]
* A substitution failure occurs if the constraints are violated.
* The aliased type is the parent class of the member. In other words, if `T` is expanded to `U C::*`, the aliased type is `C`.
[heading Input/Output Examples]
[table
[[`T`] [`class_of_t<T>`]]
[[`int foo::*`] [`foo`]]
[[`void(foo::* const &)() const`] [`foo`]]
]
[heading Example Program]
[import ../example/class_of.cpp]
[class_of]
[endsect]
*/
//]
#endif // #ifndef BOOST_CLBL_TRTS_class_of_HPP