Chris@16: // (C) Copyright David Abrahams 2002.
Chris@16: // (C) Copyright Jeremy Siek    2002.
Chris@16: // (C) Copyright Thomas Witt    2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef BOOST_INTEROPERABLE_23022003THW_HPP
Chris@16: # define BOOST_INTEROPERABLE_23022003THW_HPP
Chris@16: 
Chris@16: # include <boost/mpl/bool.hpp>
Chris@16: # include <boost/mpl/or.hpp>
Chris@16: 
Chris@16: # include <boost/type_traits/is_convertible.hpp>
Chris@16: 
Chris@16: # include <boost/iterator/detail/config_def.hpp> // must appear last
Chris@16: 
Chris@101: namespace boost {
Chris@101: namespace iterators {
Chris@16: 
Chris@16:   //
Chris@16:   // Meta function that determines whether two
Chris@16:   // iterator types are considered interoperable.
Chris@16:   //
Chris@16:   // Two iterator types A,B are considered interoperable if either
Chris@16:   // A is convertible to B or vice versa.
Chris@16:   // This interoperability definition is in sync with the
Chris@16:   // standards requirements on constant/mutable container
Chris@16:   // iterators (23.1 [lib.container.requirements]).
Chris@16:   //
Chris@101:   // For compilers that don't support is_convertible
Chris@16:   // is_interoperable gives false positives. See comments
Chris@16:   // on operator implementation for consequences.
Chris@16:   //
Chris@16:   template <typename A, typename B>
Chris@16:   struct is_interoperable
Chris@16: # ifdef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
Chris@16:     : mpl::true_
Chris@16: # else
Chris@16:     : mpl::or_<
Chris@16:           is_convertible< A, B >
Chris@16:         , is_convertible< B, A > >
Chris@16: # endif
Chris@101:   {
Chris@16:   };
Chris@16: 
Chris@101: } // namespace iterators
Chris@101: 
Chris@101: using iterators::is_interoperable;
Chris@101: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: # include <boost/iterator/detail/config_undef.hpp>
Chris@16: 
Chris@16: #endif // BOOST_INTEROPERABLE_23022003THW_HPP