ceph/src/boost/libs/python/include/boost/python/converter/pointer_type_id.hpp

   1 // Copyright David Abrahams 2002.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #ifndef POINTER_TYPE_ID_DWA2002222_HPP
   6 # define POINTER_TYPE_ID_DWA2002222_HPP
   7
   8 # include <boost/python/type_id.hpp>
   9 # include <boost/type_traits/composite_traits.hpp>
  10
  11 namespace boost { namespace python { namespace converter {
  12
  13 namespace detail
  14 {
  15   template <bool is_ref = false>
  16   struct pointer_typeid_select
  17   {
  18       template <class T>
  19       static inline type_info execute(T*(*)() = 0)
  20       {
  21           return type_id<T>();
  22       }
  23   };
  24
  25   template <>
  26   struct pointer_typeid_select<true>
  27   {
  28       template <class T>
  29       static inline type_info execute(T* const volatile&(*)() = 0)
  30       {
  31           return type_id<T>();
  32       }
  33
  34       template <class T>
  35       static inline type_info execute(T*volatile&(*)() = 0)
  36       {
  37           return type_id<T>();
  38       }
  39
  40       template <class T>
  41       static inline type_info execute(T*const&(*)() = 0)
  42       {
  43           return type_id<T>();
  44       }
  45
  46       template <class T>
  47       static inline type_info execute(T*&(*)() = 0)
  48       {
  49           return type_id<T>();
  50       }
  51   };
  52 }
  53
  54 // Usage: pointer_type_id<T>()
  55 //
  56 // Returns a type_info associated with the type pointed
  57 // to by T, which may be a pointer or a reference to a pointer.
  58 template <class T>
  59 type_info pointer_type_id(T(*)() = 0)
  60 {
  61     return detail::pointer_typeid_select<
  62           is_reference<T>::value
  63         >::execute((T(*)())0);
  64 }
  65
  66 }}} // namespace boost::python::converter
  67
  68 #endif // POINTER_TYPE_ID_DWA2002222_HPP