ceph/src/boost/libs/fusion/include/boost/fusion/functional/invocation/detail/that_ptr.hpp

   1 /*=============================================================================
   2     Copyright (c) 2006-2007 Tobias Schwinger
   3
   4     Use modification and distribution are subject to the Boost Software
   5     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6     http://www.boost.org/LICENSE_1_0.txt).
   7 ==============================================================================*/
   8
   9 #if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED)
  10 #define BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED
  11
  12 #include <boost/fusion/support/config.hpp>
  13 #include <boost/get_pointer.hpp>
  14 #include <boost/utility/addressof.hpp>
  15 #include <boost/type_traits/remove_reference.hpp>
  16
  17 namespace boost { namespace fusion { namespace detail
  18 {
  19     template <typename Wanted>
  20     struct that_ptr
  21     {
  22       private:
  23
  24         typedef typename remove_reference<Wanted>::type pointee;
  25
  26         template <typename T>
  27         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  28         static inline pointee * do_get_pointer(T &, pointee * x)
  29         {
  30             return x;
  31         }
  32         template <typename T>
  33         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  34         static inline pointee * do_get_pointer(T & x, void const *)
  35         {
  36             return get_pointer(x);
  37         }
  38
  39       public:
  40
  41         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  42         static inline pointee * get(pointee * x)
  43         {
  44             return x;
  45         }
  46
  47         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  48         static inline pointee * get(pointee & x)
  49         {
  50             return boost::addressof(x);
  51         }
  52
  53         template <typename T>
  54         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  55         static inline pointee * get(T & x)
  56         {
  57             return do_get_pointer(x, boost::addressof(x));
  58         }
  59     };
  60
  61     template <typename PtrOrSmartPtr> struct non_const_pointee;
  62
  63 #if defined(BOOST_MSVC) || (defined(__BORLANDC__) && !defined(BOOST_DISABLE_WIN32))
  64 #   define BOOST_FUSION_TRAIT_DECL __cdecl
  65 #else
  66 #   define BOOST_FUSION_TRAIT_DECL /**/
  67 #endif
  68
  69 namespace adl_barrier
  70     {
  71         using boost::get_pointer;
  72         void const * BOOST_FUSION_TRAIT_DECL get_pointer(...); // fallback
  73
  74         template< typename T> char const_tester(T *);
  75         template< typename T> long const_tester(T const *);
  76
  77         template <typename Ptr>
  78         struct non_const_pointee_impl
  79         {
  80             static Ptr & what;
  81
  82             static bool const value =
  83                 sizeof(const_tester(get_pointer(what))) == 1;
  84         };
  85     }
  86
  87     template <typename PtrOrSmartPtr> struct non_const_pointee
  88         : adl_barrier::non_const_pointee_impl<
  89               typename remove_cv<
  90                   typename remove_reference<PtrOrSmartPtr>::type >::type >
  91     {
  92         typedef non_const_pointee type;
  93         typedef bool value_type;
  94     };
  95
  96 }}}
  97
  98 #endif
  99