boost/boost/type_traits/is_member_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_MEMBER_POINTER_HPP_INCLUDED
  22 #define BOOST_TT_IS_MEMBER_POINTER_HPP_INCLUDED
  23
  24 #include <boost/type_traits/config.hpp>
  25 #include <boost/detail/workaround.hpp>
  26
  27 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !BOOST_WORKAROUND(__BORLANDC__, < 0x600)
  28 #   include <boost/type_traits/is_member_function_pointer.hpp>
  29 #else
  30 #   include <boost/type_traits/is_reference.hpp>
  31 #   include <boost/type_traits/is_array.hpp>
  32 #   include <boost/type_traits/detail/is_mem_fun_pointer_tester.hpp>
  33 #   include <boost/type_traits/detail/yes_no_type.hpp>
  34 #   include <boost/type_traits/detail/false_result.hpp>
  35 #   include <boost/type_traits/detail/ice_or.hpp>
  36 #endif
  37
  38 // should be the last #include
  39 #include <boost/type_traits/detail/bool_trait_def.hpp>
  40
  41 namespace boost {
  42
  43 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
  44 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_member_pointer,T,false)
  45 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,U T::*,true)
  46
  47 #elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
  48 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_member_pointer,T,::boost::is_member_function_pointer<T>::value)
  49 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,U T::*,true)
  50
  51 #if !BOOST_WORKAROUND(__MWERKS__,<=0x3003)
  52 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,U T::*const,true)
  53 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,U T::*volatile,true)
  54 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,U T::*const volatile,true)
  55 #endif
  56
  57 #else // no partial template specialization
  58
  59 namespace detail {
  60
  61 template <typename R, typename T>
  62 ::boost::type_traits::yes_type BOOST_TT_DECL is_member_pointer_tester(R T::*const volatile*);
  63 ::boost::type_traits::no_type BOOST_TT_DECL is_member_pointer_tester(...);
  64
  65 template <bool>
  66 struct is_member_pointer_select
  67     : ::boost::type_traits::false_result
  68 {
  69 };
  70
  71 template <>
  72 struct is_member_pointer_select<false>
  73 {
  74     template <typename T> struct result_
  75     {
  76         static T* make_t();
  77         BOOST_STATIC_CONSTANT(
  78             bool, value =
  79             (::boost::type_traits::ice_or<
  80                 (1 == sizeof(::boost::type_traits::is_mem_fun_pointer_tester(make_t()))),
  81                 (1 == sizeof(is_member_pointer_tester(make_t())))
  82             >::value) );
  83     };
  84 };
  85
  86 template <typename T>
  87 struct is_member_pointer_impl
  88     : is_member_pointer_select<
  89           ::boost::type_traits::ice_or<
  90               ::boost::is_reference<T>::value
  91             , ::boost::is_array<T>::value
  92             >::value
  93         >::template result_<T>
  94 {
  95 };
  96
  97 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_member_pointer,void,false)
  98 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
  99 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_member_pointer,void const,false)
 100 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_member_pointer,void volatile,false)
 101 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_member_pointer,void const volatile,false)
 102 #endif
 103
 104 } // namespace detail
 105
 106 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_member_pointer,T,::boost::detail::is_member_pointer_impl<T>::value)
 107
 108 #endif // __BORLANDC__
 109
 110 } // namespace boost
 111
 112 #include <boost/type_traits/detail/bool_trait_undef.hpp>
 113
 114 #endif // BOOST_TT_IS_MEMBER_POINTER_HPP_INCLUDED