75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
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// Copyright Neil Groves 2009. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_ALGORITHM_NTH_ELEMENT_HPP_INCLUDED
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#define BOOST_RANGE_ALGORITHM_NTH_ELEMENT_HPP_INCLUDED
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#include <boost/concept_check.hpp>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/concepts.hpp>
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#include <algorithm>
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namespace boost
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{
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namespace range
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{
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/// \brief template function nth_element
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///
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/// range-based version of the nth_element std algorithm
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///
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/// \pre RandomAccessRange is a model of the RandomAccessRangeConcept
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/// \pre BinaryPredicate is a model of the BinaryPredicateConcept
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template<class RandomAccessRange>
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inline RandomAccessRange& nth_element(RandomAccessRange& rng,
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BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth)
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{
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BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
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std::nth_element(boost::begin(rng), nth, boost::end(rng));
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return rng;
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}
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/// \overload
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template<class RandomAccessRange>
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inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
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BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth)
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{
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BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
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std::nth_element(boost::begin(rng), nth, boost::end(rng));
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return rng;
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}
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/// \overload
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template<class RandomAccessRange, class BinaryPredicate>
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inline RandomAccessRange& nth_element(RandomAccessRange& rng,
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BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth,
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BinaryPredicate sort_pred)
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{
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BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
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std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
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return rng;
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}
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/// \overload
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template<class RandomAccessRange, class BinaryPredicate>
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inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
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BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth,
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BinaryPredicate sort_pred)
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{
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BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
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std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
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return rng;
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}
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} // namespace range
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using range::nth_element;
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} // namespace boost
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#endif // include guard
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