Chris@16: //  Copyright Neil Groves 2009. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: #ifndef BOOST_RANGE_ALGORITHM_SWAP_RANGES_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_ALGORITHM_SWAP_RANGES_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/concept_check.hpp>
Chris@16: #include <boost/iterator/iterator_categories.hpp>
Chris@16: #include <boost/range/begin.hpp>
Chris@16: #include <boost/range/end.hpp>
Chris@16: #include <boost/range/concepts.hpp>
Chris@16: #include <boost/range/iterator.hpp>
Chris@16: #include <algorithm>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range_detail
Chris@16:     {
Chris@16:         template<class Iterator1, class Iterator2>
Chris@16:         void swap_ranges_impl(Iterator1 it1, Iterator1 last1,
Chris@16:                               Iterator2 it2, Iterator2 last2,
Chris@16:                               single_pass_traversal_tag,
Chris@16:                               single_pass_traversal_tag)
Chris@16:         {
Chris@16:             ignore_unused_variable_warning(last2);
Chris@16:             for (; it1 != last1; ++it1, ++it2)
Chris@16:             {
Chris@16:                 BOOST_ASSERT( it2 != last2 );
Chris@16:                 std::iter_swap(it1, it2);
Chris@16:             }
Chris@16:         }
Chris@16: 
Chris@16:         template<class Iterator1, class Iterator2>
Chris@16:         void swap_ranges_impl(Iterator1 it1, Iterator1 last1,
Chris@16:                               Iterator2 it2, Iterator2 last2,
Chris@16:                               random_access_traversal_tag,
Chris@16:                               random_access_traversal_tag)
Chris@16:         {
Chris@16:             ignore_unused_variable_warning(last2);
Chris@16:             BOOST_ASSERT( last2 - it2 >= last1 - it1 );
Chris@16:             std::swap_ranges(it1, last1, it2);
Chris@16:         }
Chris@16: 
Chris@16:         template<class Iterator1, class Iterator2>
Chris@16:         void swap_ranges_impl(Iterator1 first1, Iterator1 last1,
Chris@16:                               Iterator2 first2, Iterator2 last2)
Chris@16:         {
Chris@16:             swap_ranges_impl(first1, last1, first2, last2,
Chris@16:                 BOOST_DEDUCED_TYPENAME iterator_traversal<Iterator1>::type(),
Chris@16:                 BOOST_DEDUCED_TYPENAME iterator_traversal<Iterator2>::type());
Chris@16:         }
Chris@16:     } // namespace range_detail
Chris@16: 
Chris@16:     namespace range
Chris@16:     {
Chris@16: 
Chris@16: /// \brief template function swap_ranges
Chris@16: ///
Chris@16: /// range-based version of the swap_ranges std algorithm
Chris@16: ///
Chris@16: /// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
Chris@16: /// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
Chris@16: template< class SinglePassRange1, class SinglePassRange2 >
Chris@16: inline SinglePassRange2&
Chris@16: swap_ranges(SinglePassRange1& range1, SinglePassRange2& range2)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<SinglePassRange1>));
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<SinglePassRange2>));
Chris@16: 
Chris@16:     boost::range_detail::swap_ranges_impl(
Chris@16:         boost::begin(range1), boost::end(range1),
Chris@16:         boost::begin(range2), boost::end(range2));
Chris@16: 
Chris@16:     return range2;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template< class SinglePassRange1, class SinglePassRange2 >
Chris@16: inline SinglePassRange2&
Chris@16: swap_ranges(const SinglePassRange1& range1, SinglePassRange2& range2)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<const SinglePassRange1>));
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<SinglePassRange2>));
Chris@16: 
Chris@16:     boost::range_detail::swap_ranges_impl(
Chris@16:         boost::begin(range1), boost::end(range1),
Chris@16:         boost::begin(range2), boost::end(range2));
Chris@16: 
Chris@16:     return range2;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template< class SinglePassRange1, class SinglePassRange2 >
Chris@16: inline const SinglePassRange2&
Chris@16: swap_ranges(SinglePassRange1& range1, const SinglePassRange2& range2)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<SinglePassRange1>));
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<const SinglePassRange2>));
Chris@16: 
Chris@16:     boost::range_detail::swap_ranges_impl(
Chris@16:         boost::begin(range1), boost::end(range1),
Chris@16:         boost::begin(range2), boost::end(range2));
Chris@16: 
Chris@16:     return range2;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template< class SinglePassRange1, class SinglePassRange2 >
Chris@16: inline const SinglePassRange2&
Chris@16: swap_ranges(const SinglePassRange1& range1, const SinglePassRange2& range2)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<const SinglePassRange1>));
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT((SinglePassRangeConcept<const SinglePassRange2>));
Chris@16: 
Chris@16:     boost::range_detail::swap_ranges_impl(
Chris@16:         boost::begin(range1), boost::end(range1),
Chris@16:         boost::begin(range2), boost::end(range2));
Chris@16: 
Chris@16:     return range2;
Chris@16: }
Chris@16: 
Chris@16:     } // namespace range
Chris@16:     using range::swap_ranges;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard