ceph/src/boost/libs/type_traits/include/boost/type_traits/decay.hpp

   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