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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
19 namespace 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 } // namespace boost
41
42
43 #endif // BOOST_TT_DECAY_HPP_INCLUDED