boost/type_traits/msvc/remove_pointer.hpp

   1 // Copyright (C) 2004 Peder Holt
   2 // Use, modification and distribution is subject to the Boost Software
   3 // License, Version 1.0. (http://www.boost.org/LICENSE_1_0.txt)
   4
   5 #ifndef BOOST_TYPE_TRAITS_MSVC_REMOVE_POINTER_HOLT_2004_0827
   6 #define BOOST_TYPE_TRAITS_MSVC_REMOVE_POINTER_HOLT_2004_0827
   7
   8 #include <boost/type_traits/msvc/typeof.hpp>
   9 #include <boost/type_traits/is_pointer.hpp>
  10
  11 namespace boost {
  12     namespace detail {
  13         template<int IsPointer>
  14         struct remove_pointer_impl_typeof {
  15             template<typename T,typename ID>
  16             struct inner {
  17                 typedef T type;
  18             };
  19         };
  20         template<>
  21         struct remove_pointer_impl_typeof<true> {
  22             template<typename T,typename ID>
  23             struct inner {
  24                 template<typename U>
  25                 static msvc_register_type<U,ID> test(U*);
  26                 static msvc_register_type<T,ID> test(...);
  27                 BOOST_STATIC_CONSTANT(unsigned,register_test=sizeof(test( *((T*)NULL) ) ));
  28                 typedef typename msvc_extract_type<ID>::id2type::type type;
  29             };
  30         };
  31     } //namespace detail
  32
  33     template<typename T>
  34     struct remove_pointer {
  35         typedef typename boost::detail::remove_pointer_impl_typeof<
  36             boost::is_pointer<T>::value
  37         >::template inner<T,remove_pointer<T> >::type type;
  38         BOOST_MPL_AUX_LAMBDA_SUPPORT(1,remove_pointer,T)
  39     };
  40 } //namespace boost
  41
  42 #endif //BOOST_TYPE_TRAITS_REMOVE_POINTER_HOLT_2004_0827