advance.cpp
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// Copyright Aleksey Gurtovoy 2000-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.
// $Id$
// $Date$
// $Revision$
#include <boost/mpl/advance.hpp>
#include <boost/mpl/iterator_tags.hpp>
#include <boost/mpl/aux_/test.hpp>
template< int pos > struct iter
{
typedef mpl::bidirectional_iterator_tag category;
typedef iter<(pos + 1)> next;
typedef iter<(pos - 1)> prior;
typedef int_<pos> type;
};
#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
namespace boost { namespace mpl {
template< int pos, typename Default > struct tag< iter<pos>,Default > : void_ {};
}}
#endif
typedef iter<0> first;
typedef iter<10> last;
MPL_TEST_CASE()
{
typedef mpl::advance<first,int_<10> >::type iter1;
typedef advance_c<first,10>::type iter2;
MPL_ASSERT(( is_same<iter1, last> ));
MPL_ASSERT(( is_same<iter2, last> ));
}
MPL_TEST_CASE()
{
typedef mpl::advance<last,int_<-10> >::type iter1;
typedef advance_c<last,-10>::type iter2;
MPL_ASSERT(( is_same<iter1, first> ));
MPL_ASSERT(( is_same<iter2, first> ));
}