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64 lines
1.9 KiB
Plaintext
64 lines
1.9 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:partition partition]
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[heading Prototype]
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``
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template<
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class ForwardRange,
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class UnaryPredicate
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>
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typename range_iterator<ForwardRange>::type
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partition(ForwardRange& rng, UnaryPredicate pred);
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template<
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class ForwardRange,
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class UnaryPredicate
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>
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typename range_iterator<const ForwardRange>::type
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partition(const ForwardRange& rng, UnaryPredicate pred);
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template<
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range_return_value re,
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class ForwardRange,
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class UnaryPredicate
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>
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typename range_return<ForwardRange, re>::type
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partition(ForwardRange& rng, UnaryPredicate pred);
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template<
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range_return_value re,
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class ForwardRange,
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class UnaryPredicate
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>
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typename range_return<const ForwardRange, re>::type
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partition(const ForwardRange& rng, UnaryPredicate pred);
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``
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[heading Description]
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`partition` orders the elements in `rng` based on `pred`, such that the elements that satisfy `pred` precede the elements that do not. In the versions that return a single iterator, the return value is the middle iterator. In the versions that have a configurable range_return, `found` corresponds to the middle iterator.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/partition.hpp`
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[heading Requirements]
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* `ForwardRange` is a model of the __forward_range__ Concept. For C++ versions prior to C++11 the underlying std::partition requires Bidirectional Iterators, hence the requirement for older library versions is for a __bidirectional_range__.
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* `UnaryPredicate` is a model of the `PredicateConcept`.
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* `ForwardRange`'s value type is convertible to `UnaryPredicate`'s argument type.
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[heading Complexity]
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Linear. Exactly `distance(rng)` applications of `pred`, and at most `distance(rng) / 2` swaps.
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[endsect]
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