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57 lines
2.0 KiB
Plaintext
57 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:prev_permutation prev_permutation]
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[heading Prototype]
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``
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template<class BidirectionalRange>
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bool prev_permutation(BidirectionalRange& rng);
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template<class BidirectionalRange>
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bool prev_permutation(const BidirectionalRange& rng);
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template<class BidirectionalRange, class Compare>
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bool prev_permutation(BidirectionalRange& rng, Compare pred);
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template<class BidirectionalRange, class Compare>
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bool prev_permutation(const BidirectionalRange& rng, Compare pred);
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``
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[heading Description]
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`prev_permutation` transforms the range of elements `rng` into the lexicographically next smaller permutation of the elements if such a permutation exists. If one does not exist then the range is transformed into the lexicographically largest permutation and `false` is returned. `true` is returned when the next smaller permutation is successfully generated.
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The ordering relationship is determined by using `operator<` in the non-predicate versions, and by evaluating `pred` in the predicate versions.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/permutation.hpp`
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[heading Requirements]
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[*For the non-predicate versions:]
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* `BidirectionalRange` is a model of the __bidirectional_range__ Concept.
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* `BidirectionalRange` is mutable.
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* `BidirectionalRange`'s value type is a model of the `LessThanComparableConcept`.
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* The ordering of objects of type `BidirectionalRange`'s value type is a [*/strict weak ordering/], as defined in the `LessThanComparableConcept` requirements.
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[*For the predicate versions:]
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* `BidirectionalRange` is a model of the __bidirectional_range__ Concept.
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* `BidirectionalRange` is mutable.
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* `Compare` is a model of the `StrictWeakOrderingConcept`.
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* `BidirectionalRange`'s value type is convertible to both of `Compare`'s argument types.
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[heading Complexity]
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Linear. At most `distance(rng) / 2` swaps.
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[endsect]
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