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_NTH_ELEMENT_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_ALGORITHM_NTH_ELEMENT_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/concept_check.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 <algorithm>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range
Chris@16:     {
Chris@16: 
Chris@16: /// \brief template function nth_element
Chris@16: ///
Chris@16: /// range-based version of the nth_element std algorithm
Chris@16: ///
Chris@16: /// \pre RandomAccessRange is a model of the RandomAccessRangeConcept
Chris@16: /// \pre BinaryPredicate is a model of the BinaryPredicateConcept
Chris@16: template<class RandomAccessRange>
Chris@16: inline RandomAccessRange& nth_element(RandomAccessRange& rng,
Chris@16:     BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
Chris@16:     std::nth_element(boost::begin(rng), nth, boost::end(rng));
Chris@16:     return rng;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template<class RandomAccessRange>
Chris@16: inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
Chris@16:     BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
Chris@16:     std::nth_element(boost::begin(rng), nth, boost::end(rng));
Chris@16:     return rng;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template<class RandomAccessRange, class BinaryPredicate>
Chris@16: inline RandomAccessRange& nth_element(RandomAccessRange& rng,
Chris@16:     BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth,
Chris@16:     BinaryPredicate sort_pred)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
Chris@16:     std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
Chris@16:     return rng;
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template<class RandomAccessRange, class BinaryPredicate>
Chris@16: inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
Chris@16:     BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth,
Chris@16:     BinaryPredicate sort_pred)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
Chris@16:     std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
Chris@16:     return rng;
Chris@16: }
Chris@16: 
Chris@16:     } // namespace range
Chris@16:     using range::nth_element;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard