3rdparty/boost/boost/type_traits/is_base_of.hpp

   1
   2 //  (C) Copyright Rani Sharoni 2003-2005.
   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_IS_BASE_OF_HPP_INCLUDED
  10 #define BOOST_TT_IS_BASE_OF_HPP_INCLUDED
  11
  12 #include <boost/type_traits/is_base_and_derived.hpp>
  13 #include <boost/type_traits/is_same.hpp>
  14 #include <boost/type_traits/is_class.hpp>
  15
  16 namespace boost {
  17
  18    namespace detail{
  19       template <class B, class D>
  20       struct is_base_of_imp
  21       {
  22           typedef typename remove_cv<B>::type ncvB;
  23           typedef typename remove_cv<D>::type ncvD;
  24           BOOST_STATIC_CONSTANT(bool, value = (
  25             (::boost::detail::is_base_and_derived_impl<ncvB,ncvD>::value) ||
  26             (::boost::is_same<ncvB,ncvD>::value && ::boost::is_class<ncvB>::value)));
  27       };
  28    }
  29
  30    template <class Base, class Derived> struct is_base_of
  31       : public integral_constant<bool, (::boost::detail::is_base_of_imp<Base, Derived>::value)> {};
  32
  33    template <class Base, class Derived> struct is_base_of<Base, Derived&> : false_type{};
  34    template <class Base, class Derived> struct is_base_of<Base&, Derived&> : false_type{};
  35    template <class Base, class Derived> struct is_base_of<Base&, Derived> : false_type{};
  36
  37 } // namespace boost
  38
  39 #endif // BOOST_TT_IS_BASE_AND_DERIVED_HPP_INCLUDED