1
2// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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_REMOVE_POINTER_HPP_INCLUDED
10#define BOOST_TT_REMOVE_POINTER_HPP_INCLUDED
11
12#include <boost/config.hpp>
13#include <boost/config/workaround.hpp>
14
15#if defined(BOOST_MSVC)
16#include <boost/type_traits/remove_cv.hpp>
17#include <boost/type_traits/is_pointer.hpp>
18#endif
19
20namespace boost {
21
22#if BOOST_WORKAROUND(BOOST_MSVC, < 1900)
23
24namespace detail{
25
26 //
27 // We need all this crazy indirection because a type such as:
28 //
29 // T (*const)(U)
30 //
31 // Does not bind to a <T*> or <T*const> partial specialization with VC10 and earlier
32 //
33 template <class T>
34 struct remove_pointer_imp
35 {
36 typedef T type;
37 };
38
39 template <class T>
40 struct remove_pointer_imp<T*>
41 {
42 typedef T type;
43 };
44
45 template <class T, bool b>
46 struct remove_pointer_imp3
47 {
48 typedef typename remove_pointer_imp<typename boost::remove_cv<T>::type>::type type;
49 };
50
51 template <class T>
52 struct remove_pointer_imp3<T, false>
53 {
54 typedef T type;
55 };
56
57 template <class T>
58 struct remove_pointer_imp2
59 {
60 typedef typename remove_pointer_imp3<T, ::boost::is_pointer<T>::value>::type type;
61 };
62}
63
64template <class T> struct remove_pointer{ typedef typename boost::detail::remove_pointer_imp2<T>::type type; };
65
66#else
67
68template <class T> struct remove_pointer{ typedef T type; };
69template <class T> struct remove_pointer<T*>{ typedef T type; };
70template <class T> struct remove_pointer<T*const>{ typedef T type; };
71template <class T> struct remove_pointer<T*volatile>{ typedef T type; };
72template <class T> struct remove_pointer<T*const volatile>{ typedef T type; };
73
74#endif
75
76#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
77
78 template <class T> using remove_pointer_t = typename remove_pointer<T>::type;
79
80#endif
81
82} // namespace boost
83
84#endif // BOOST_TT_REMOVE_POINTER_HPP_INCLUDED
85

source code of boost/libs/type_traits/include/boost/type_traits/remove_pointer.hpp