boost/type_traits/add_pointer.hpp

   1
   2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6 //
   7 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   8
   9 #ifndef BOOST_TT_ADD_POINTER_HPP_INCLUDED
  10 #define BOOST_TT_ADD_POINTER_HPP_INCLUDED
  11
  12 #include <boost/type_traits/remove_reference.hpp>
  13
  14 // should be the last #include
  15 #include <boost/type_traits/detail/type_trait_def.hpp>
  16
  17 namespace boost {
  18
  19 namespace detail {
  20
  21 #if defined(__BORLANDC__) && (__BORLANDC__ < 0x5A0)
  22 //
  23 // For some reason this implementation stops Borlands compiler
  24 // from dropping cv-qualifiers, it still fails with references
  25 // to arrays for some reason though (shrug...) (JM 20021104)
  26 //
  27 template <typename T>
  28 struct add_pointer_impl
  29 {
  30     typedef T* type;
  31 };
  32 template <typename T>
  33 struct add_pointer_impl<T&>
  34 {
  35     typedef T* type;
  36 };
  37 template <typename T>
  38 struct add_pointer_impl<T&const>
  39 {
  40     typedef T* type;
  41 };
  42 template <typename T>
  43 struct add_pointer_impl<T&volatile>
  44 {
  45     typedef T* type;
  46 };
  47 template <typename T>
  48 struct add_pointer_impl<T&const volatile>
  49 {
  50     typedef T* type;
  51 };
  52
  53 #else
  54
  55 template <typename T>
  56 struct add_pointer_impl
  57 {
  58     typedef typename remove_reference<T>::type no_ref_type;
  59     typedef no_ref_type* type;
  60 };
  61
  62 #endif
  63
  64 } // namespace detail
  65
  66 BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_pointer,T,typename boost::detail::add_pointer_impl<T>::type)
  67
  68 } // namespace boost
  69
  70 #include <boost/type_traits/detail/type_trait_undef.hpp>
  71
  72 #endif // BOOST_TT_ADD_POINTER_HPP_INCLUDED