ceph/src/boost/libs/random/include/boost/random/detail/ptr_helper.hpp

   1 /* boost random/detail/ptr_helper.hpp header file
   2  *
   3  * Copyright Jens Maurer 2002
   4  * Distributed under the Boost Software License, Version 1.0. (See
   5  * accompanying file LICENSE_1_0.txt or copy at
   6  * http://www.boost.org/LICENSE_1_0.txt)
   7  *
   8  * See http://www.boost.org for most recent version including documentation.
   9  *
  10  * $Id$
  11  *
  12  */
  13
  14 #ifndef BOOST_RANDOM_DETAIL_PTR_HELPER_HPP
  15 #define BOOST_RANDOM_DETAIL_PTR_HELPER_HPP
  16
  17 #include <boost/config.hpp>
  18
  19
  20 namespace boost {
  21 namespace random {
  22 namespace detail {
  23
  24 // type_traits could help here, but I don't want to depend on type_traits.
  25 template<class T>
  26 struct ptr_helper
  27 {
  28   typedef T value_type;
  29   typedef T& reference_type;
  30   typedef const T& rvalue_type;
  31   static reference_type ref(T& r) { return r; }
  32   static const T& ref(const T& r) { return r; }
  33 };
  34
  35 template<class T>
  36 struct ptr_helper<T&>
  37 {
  38   typedef T value_type;
  39   typedef T& reference_type;
  40   typedef T& rvalue_type;
  41   static reference_type ref(T& r) { return r; }
  42   static const T& ref(const T& r) { return r; }
  43 };
  44
  45 template<class T>
  46 struct ptr_helper<T*>
  47 {
  48   typedef T value_type;
  49   typedef T& reference_type;
  50   typedef T* rvalue_type;
  51   static reference_type ref(T * p) { return *p; }
  52   static const T& ref(const T * p) { return *p; }
  53 };
  54
  55 } // namespace detail
  56 } // namespace random
  57 } // namespace boost
  58
  59 //
  60 // BOOST_RANDOM_PTR_HELPER_SPEC --
  61 //
  62 //  Helper macro for broken compilers defines specializations of
  63 //  ptr_helper.
  64 //
  65 # define BOOST_RANDOM_PTR_HELPER_SPEC(T)
  66
  67 #endif // BOOST_RANDOM_DETAIL_PTR_HELPER_HPP