boost/type_traits/remove_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_REMOVE_POINTER_HPP_INCLUDED
  10 #define BOOST_TT_REMOVE_POINTER_HPP_INCLUDED
  11
  12 #include <boost/config.hpp>
  13 #include <boost/detail/workaround.hpp>
  14 #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  15 #include <boost/type_traits/broken_compiler_spec.hpp>
  16 #endif
  17
  18 #if BOOST_WORKAROUND(BOOST_MSVC,<=1300)
  19 #include <boost/type_traits/msvc/remove_pointer.hpp>
  20 #elif defined(BOOST_MSVC)
  21 #include <boost/type_traits/remove_cv.hpp>
  22 #include <boost/type_traits/is_pointer.hpp>
  23 #endif
  24
  25 // should be the last #include
  26 #include <boost/type_traits/detail/type_trait_def.hpp>
  27
  28 namespace boost {
  29
  30 #ifdef BOOST_MSVC
  31
  32 namespace detail{
  33
  34    //
  35    // We need all this crazy indirection because a type such as:
  36    //
  37    // T (*const)(U)
  38    //
  39    // Does not bind to a <T*> or <T*const> partial specialization with VC10 and earlier
  40    //
  41    template <class T>
  42    struct remove_pointer_imp
  43    {
  44       typedef T type;
  45    };
  46
  47    template <class T>
  48    struct remove_pointer_imp<T*>
  49    {
  50       typedef T type;
  51    };
  52
  53    template <class T, bool b>
  54    struct remove_pointer_imp3
  55    {
  56       typedef typename remove_pointer_imp<typename boost::remove_cv<T>::type>::type type;
  57    };
  58
  59    template <class T>
  60    struct remove_pointer_imp3<T, false>
  61    {
  62       typedef T type;
  63    };
  64
  65    template <class T>
  66    struct remove_pointer_imp2
  67    {
  68       typedef typename remove_pointer_imp3<T, ::boost::is_pointer<T>::value>::type type;
  69    };
  70 }
  71
  72 BOOST_TT_AUX_TYPE_TRAIT_DEF1(remove_pointer,T,typename boost::detail::remove_pointer_imp2<T>::type)
  73
  74 #elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  75
  76 BOOST_TT_AUX_TYPE_TRAIT_DEF1(remove_pointer,T,T)
  77 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_pointer,T*,T)
  78 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_pointer,T* const,T)
  79 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_pointer,T* volatile,T)
  80 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,remove_pointer,T* const volatile,T)
  81
  82 #elif !BOOST_WORKAROUND(BOOST_MSVC,<=1300)
  83
  84 BOOST_TT_AUX_TYPE_TRAIT_DEF1(remove_pointer,T,typename boost::detail::remove_pointer_impl<T>::type)
  85
  86 #endif
  87
  88 } // namespace boost
  89
  90 #include <boost/type_traits/detail/type_trait_undef.hpp>
  91
  92 #endif // BOOST_TT_REMOVE_POINTER_HPP_INCLUDED