boost/boost/type_traits/is_base_and_derived.hpp

   1
   2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 // Permission to copy, use, modify, sell and distribute this software is
   4 // granted provided this copyright notice appears in all copies. This software
   5 // is provided "as is" without express or implied warranty, and with no claim
   6 // as to its suitability for any purpose.
   7 //
   8 // See http://www.boost.org for most recent version including documentation.
   9
  10 #ifndef BOOST_TT_IS_BASE_AND_DERIVED_HPP_INCLUDED
  11 #define BOOST_TT_IS_BASE_AND_DERIVED_HPP_INCLUDED
  12
  13 #include "boost/type_traits/is_class.hpp"
  14 #include "boost/type_traits/is_convertible.hpp"
  15 #include "boost/type_traits/detail/ice_and.hpp"
  16 #include "boost/config.hpp"
  17
  18 // should be the last #include
  19 #include "boost/type_traits/detail/bool_trait_def.hpp"
  20
  21 namespace boost {
  22
  23 namespace detail {
  24
  25 template <typename Base, typename Derived>
  26 struct is_base_and_derived_impl
  27 {
  28    BOOST_STATIC_CONSTANT(bool, value =
  29       (::boost::type_traits::ice_and<
  30          ::boost::is_convertible<Derived*,Base*>::value,
  31          ::boost::is_class<Derived>::value,
  32          ::boost::is_class<Base>::value
  33       >::value)
  34    );
  35 };
  36
  37 } // namespace detail
  38
  39 BOOST_TT_AUX_BOOL_TRAIT_DEF2(
  40       is_base_and_derived
  41     , Base
  42     , Derived
  43     , (::boost::detail::is_base_and_derived_impl<Base,Derived>::value)
  44     )
  45
  46 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
  47 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_2(typename Base,typename Derived,is_base_and_derived,Base&,Derived,false)
  48 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_2(typename Base,typename Derived,is_base_and_derived,Base,Derived&,false)
  49 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_2(typename Base,typename Derived,is_base_and_derived,Base&,Derived&,false)
  50 #endif
  51
  52 } // namespace boost
  53
  54 #include "boost/type_traits/detail/bool_trait_undef.hpp"
  55
  56 #endif // BOOST_TT_IS_BASE_AND_DERIVED_HPP_INCLUDED