// (C) Copyright David Abrahams 2002. // (C) Copyright Jeremy Siek 2002. // (C) Copyright Thomas Witt 2002. // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_INTEROPERABLE_23022003THW_HPP # define BOOST_INTEROPERABLE_23022003THW_HPP # include <boost/mpl/bool.hpp> # include <boost/mpl/or.hpp> # include <boost/type_traits/is_convertible.hpp> # include <boost/iterator/detail/config_def.hpp> // must appear last namespace boost { // // Meta function that determines whether two // iterator types are considered interoperable. // // Two iterator types A,B are considered interoperable if either // A is convertible to B or vice versa. // This interoperability definition is in sync with the // standards requirements on constant/mutable container // iterators (23.1 [lib.container.requirements]). // // For compilers that don't support is_convertible // is_interoperable gives false positives. See comments // on operator implementation for consequences. // template <typename A, typename B> struct is_interoperable # ifdef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY : mpl::true_ # else : mpl::or_< is_convertible< A, B > , is_convertible< B, A > > # endif { }; } // namespace boost # include <boost/iterator/detail/config_undef.hpp> #endif // BOOST_INTEROPERABLE_23022003THW_HPP