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68 lines
2.0 KiB
Plaintext
68 lines
2.0 KiB
Plaintext
[/
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Copyright 2010 Neil Groves
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/]
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[section:nth_element nth_element]
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[heading Prototype]
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``
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template<class RandomAccessRange>
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RandomAccessRange& nth_element(
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RandomAccessRange& rng,
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typename range_iterator<RandomAccessRange>::type nth);
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template<class RandomAccessRange>
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const RandomAccessRange& nth_element(
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const RandomAccessRange& rng,
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typename range_iterator<const RandomAccessRange>::type nth);
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template<class RandomAccessRange>
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RandomAccessRange& nth_element(
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RandomAccessRange& rng,
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typename range_iterator<RandomAccessRange>::type nth,
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BinaryPredicate sort_pred);
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template<class RandomAccessRange>
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const RandomAccessRange& nth_element(
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const RandomAccessRange& rng,
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typename range_iterator<const RandomAccessRange>::type nth,
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BinaryPredicate sort_pred);
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``
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[heading Description]
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`nth_element` partially orders a range of elements. `nth_element` arranges the range `rng` such that the element corresponding with the iterator `nth` is the same as the element that would be in that position if `rng` has been sorted.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/nth_element.hpp`
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[heading Requirements]
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[*For the non-predicate version:]
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* `RandomAccessRange` is a model of the __random_access_range__ Concept.
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* `RandomAccessRange` is mutable.
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* `RandomAccessRange`'s value type is a model of the `LessThanComparableConcept`.
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* The ordering relation on `RandomAccessRange`'s value type is a [*/strict weak ordering/], as defined in the `LessThanComparableConcept` requirements.
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[*For the predicate version:]
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* `RandomAccessRange` is a model of the __random_access_range__ Concept.
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* `RandomAccessRange` is mutable.
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* `BinaryPredicate` is a model of the `StrictWeakOrderingConcept`.
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* `RandomAccessRange`'s value type is convertible to both of `BinaryPredicate`'s argument types.
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[heading Complexity]
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On average, linear in `distance(rng)`.
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[endsect]
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