1// (C) Copyright John Maddock & Thorsten Ottosen 2005.
2// Use, modification and distribution are subject to the Boost Software License,
3// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt).
5//
6// See http://www.boost.org/libs/type_traits for most recent version including documentation.
7
8
9#ifndef BOOST_TT_DECAY_HPP_INCLUDED
10#define BOOST_TT_DECAY_HPP_INCLUDED
11
12#include <boost/type_traits/is_array.hpp>
13#include <boost/type_traits/is_function.hpp>
14#include <boost/type_traits/remove_bounds.hpp>
15#include <boost/type_traits/add_pointer.hpp>
16#include <boost/type_traits/remove_reference.hpp>
17#include <boost/type_traits/remove_cv.hpp>
18
19namespace boost
20{
21
22 namespace detail
23 {
24
25 template <class T, bool Array, bool Function> struct decay_imp { typedef typename remove_cv<T>::type type; };
26 template <class T> struct decay_imp<T, true, false> { typedef typename remove_bounds<T>::type* type; };
27 template <class T> struct decay_imp<T, false, true> { typedef T* type; };
28
29 }
30
31 template< class T >
32 struct decay
33 {
34 private:
35 typedef typename remove_reference<T>::type Ty;
36 public:
37 typedef typename boost::detail::decay_imp<Ty, boost::is_array<Ty>::value, boost::is_function<Ty>::value>::type type;
38 };
39
40#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
41
42 template <class T> using decay_t = typename decay<T>::type;
43
44#endif
45
46} // namespace boost
47
48
49#endif // BOOST_TT_DECAY_HPP_INCLUDED
50

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