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