projects / ceph.git / blame
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1 | [/ |
| 2 | Copyright 2010 Neil Groves | |
| 3 | Distributed under the Boost Software License, Version 1.0. | |
| 4 | (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 5 | /] | |
| 6 | [section:prev_permutation prev_permutation] | |
| 7 | ||
| 8 | [heading Prototype] | |
| 9 | ||
| 10 | `` | |
| 11 | template<class BidirectionalRange> | |
| 12 | bool prev_permutation(BidirectionalRange& rng); | |
| 13 | ||
| 14 | template<class BidirectionalRange> | |
| 15 | bool prev_permutation(const BidirectionalRange& rng); | |
| 16 | ||
| 17 | template<class BidirectionalRange, class Compare> | |
| 18 | bool prev_permutation(BidirectionalRange& rng, Compare pred); | |
| 19 | ||
| 20 | template<class BidirectionalRange, class Compare> | |
| 21 | bool prev_permutation(const BidirectionalRange& rng, Compare pred); | |
| 22 | `` | |
| 23 | ||
| 24 | [heading Description] | |
| 25 | ||
| 26 | `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. | |
| 27 | ||
| 28 | The ordering relationship is determined by using `operator<` in the non-predicate versions, and by evaluating `pred` in the predicate versions. | |
| 29 | ||
| 30 | [heading Definition] | |
| 31 | ||
| 32 | Defined in the header file `boost/range/algorithm/permutation.hpp` | |
| 33 | ||
| 34 | [heading Requirements] | |
| 35 | ||
| 36 | [*For the non-predicate versions:] | |
| 37 | ||
| 38 | * `BidirectionalRange` is a model of the __bidirectional_range__ Concept. | |
| 39 | * `BidirectionalRange` is mutable. | |
| 40 | * `BidirectionalRange`'s value type is a model of the `LessThanComparableConcept`. | |
| 41 | * The ordering of objects of type `BidirectionalRange`'s value type is a [*/strict weak ordering/], as defined in the `LessThanComparableConcept` requirements. | |
| 42 | ||
| 43 | [*For the predicate versions:] | |
| 44 | ||
| 45 | * `BidirectionalRange` is a model of the __bidirectional_range__ Concept. | |
| 46 | * `BidirectionalRange` is mutable. | |
| 47 | * `Compare` is a model of the `StrictWeakOrderingConcept`. | |
| 48 | * `BidirectionalRange`'s value type is convertible to both of `Compare`'s argument types. | |
| 49 | ||
| 50 | [heading Complexity] | |
| 51 | ||
| 52 | Linear. At most `distance(rng) / 2` swaps. | |
| 53 | ||
| 54 | [endsect] | |
| 55 | ||
| 56 |