boost/type_traits/is_pointer.hpp

   1
   2 //  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
   3 //      Howard Hinnant and John Maddock 2000.
   4 //  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
   5
   6 //  Use, modification and distribution are subject to the Boost Software License,
   7 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   8 //  http://www.boost.org/LICENSE_1_0.txt).
   9 //
  10 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
  11
  12 //    Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
  13 //    is_member_pointer based on the Simulated Partial Specialization work
  14 //    of Mat Marcus and Jesse Jones. See  http://opensource.adobe.com or
  15 //    http://groups.yahoo.com/group/boost/message/5441
  16 //    Some workarounds in here use ideas suggested from "Generic<Programming>:
  17 //    Mappings between Types and Values"
  18 //    by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
  19
  20
  21 #ifndef BOOST_TT_IS_POINTER_HPP_INCLUDED
  22 #define BOOST_TT_IS_POINTER_HPP_INCLUDED
  23
  24 #include <boost/type_traits/is_member_pointer.hpp>
  25 #include <boost/type_traits/detail/ice_and.hpp>
  26 #include <boost/type_traits/detail/ice_not.hpp>
  27 #include <boost/type_traits/config.hpp>
  28 #include <boost/type_traits/remove_cv.hpp>
  29
  30
  31 // should be the last #include
  32 #include <boost/type_traits/detail/bool_trait_def.hpp>
  33
  34 namespace boost {
  35
  36 #if defined( __CODEGEARC__ )
  37 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,__is_pointer(T))
  38 #else
  39
  40 namespace detail {
  41
  42 template< typename T > struct is_pointer_helper
  43 {
  44     BOOST_STATIC_CONSTANT(bool, value = false);
  45 };
  46
  47 #   define TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(helper,sp,result) \
  48 template< typename T > struct helper<sp> \
  49 { \
  50     BOOST_STATIC_CONSTANT(bool, value = result); \
  51 }; \
  52 /**/
  53
  54 TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T*,true)
  55
  56 #   undef TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC
  57
  58 template< typename T >
  59 struct is_pointer_impl
  60 {
  61     BOOST_STATIC_CONSTANT(bool, value =
  62         (::boost::type_traits::ice_and<
  63         ::boost::detail::is_pointer_helper<typename remove_cv<T>::type>::value
  64             , ::boost::type_traits::ice_not<
  65                 ::boost::is_member_pointer<T>::value
  66                 >::value
  67             >::value)
  68         );
  69 };
  70
  71 } // namespace detail
  72
  73 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)
  74
  75 #if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600)
  76 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T&,false)
  77 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const,false)
  78 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& volatile,false)
  79 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const volatile,false)
  80 #endif
  81
  82 #endif
  83
  84 } // namespace boost
  85
  86 #include <boost/type_traits/detail/bool_trait_undef.hpp>
  87
  88 #endif // BOOST_TT_IS_POINTER_HPP_INCLUDED