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
40