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- [/
- Copyright 2010 Neil Groves
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- /]
- [section:unique unique]
- [heading Prototype]
- ``
- template<class ForwardRange>
- typename range_return<ForwardRange, return_begin_found>::type
- unique(ForwardRange& rng);
- template<class ForwardRange>
- typename range_return<const ForwardRange, return_begin_found>::type
- unique(const ForwardRange& rng);
- template<class ForwardRange, class BinaryPredicate>
- typename range_return<ForwardRange, return_begin_found>::type
- unique(ForwardRange& rng, BinaryPredicate pred);
- template<class ForwardRange, class BinaryPredicate>
- typename range_return<const ForwardRange, return_begin_found>::type
- unique(const ForwardRange& rng, BinaryPredicate pred);
- template<range_return_value re, class ForwardRange>
- typename range_return<ForwardRange, re>::type
- unique(ForwardRange& rng);
- template<range_return_value re, class ForwardRange>
- typename range_return<const ForwardRange, re>::type
- unique(const ForwardRange& rng);
- template<range_return_value re, class ForwardRange, class BinaryPredicate>
- typename range_return<ForwardRange, re>::type
- unique(ForwardRange& rng, BinaryPredicate pred);
- template<range_return_value re, class ForwardRange, class BinaryPredicate>
- typename range_return<const ForwardRange, re>::type
- unique(const ForwardRange& rng, BinaryPredicate pred);
- ``
- [heading Description]
- `unique` removes all but the first element of each sequence of duplicate encountered in `rng`.
- Elements in the range `[new_last, end(rng))` are dereferenceable but undefined.
- Equality is determined by the predicate if one is supplied, or by `operator==()` for `ForwardRange`'s value type.
- [heading Definition]
- Defined in the header file `boost/range/algorithm/unique.hpp`
- [heading Requirements]
- [*For the non-predicate versions of unique:]
- * `ForwardRange` is a model of the __forward_range__ Concept.
- * `ForwardRange` is mutable.
- * `ForwardRange`'s value type is a model of the `EqualityComparableConcept`.
- [*For the predicate versions of unique:]
- * `ForwardRange` is a model of the __forward_range__ Concept.
- * `ForwardRange` is mutable.
- * `BinaryPredicate` is a model of the `BinaryPredicateConcept`.
- * `ForwardRange`'s value type is convertible to `BinaryPredicate`'s first argument type and to `BinaryPredicate`'s second argument type.
- [heading Complexity]
- Linear. `O(N)` where `N` is `distance(rng)`. Exactly `distance(rng)` comparisons are performed.
- [endsect]
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