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84 lines
2.8 KiB
Plaintext
84 lines
2.8 KiB
Plaintext
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[/
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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:equal_range equal_range]
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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 Value
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>
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std::pair<typename range_iterator<ForwardRange>::type,
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typename range_iterator<ForwardRange>::type>
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equal_range(ForwardRange& rng, const Value& val);
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template<
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class ForwardRange,
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class Value
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>
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std::pair<typename range_iterator<const ForwardRange>::type,
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typename range_iterator<const ForwardRange>::type>
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equal_range(const ForwardRange& rng, const Value& val);
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template<
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class ForwardRange,
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class Value,
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class SortPredicate
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>
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std::pair<typename range_iterator<ForwardRange>::type,
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typename range_iterator<ForwardRange>::type>
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equal_range(ForwardRange& rng, const Value& val, SortPredicate pred);
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template<
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class ForwardRange,
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class Value,
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class SortPredicate
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>
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std::pair<typename range_iterator<const ForwardRange>::type,
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typename range_iterator<const ForwardRange>::type>
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equal_range(const ForwardRange& rng, const Value& val, SortPredicate pred);
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``
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[heading Description]
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`equal_range` returns a range in the form of a pair of iterators where all of the elements are equal to `val`. If no values are found that are equal to `val`, then an empty range is returned, hence `result.first == result.second`. For the non-predicate versions of `equal_range` the equality of elements is determined by `operator<`.
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For the predicate versions of `equal_range` the equality of elements is determined by `pred`.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/equal_range.hpp`
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[heading Requirements]
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[*For the non-predicate versions:]
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* `ForwardRange` is a model of the __forward_range__ Concept.
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* `Value` is a model of the `LessThanComparableConcept`.
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* The ordering of objects of type `Value` is a [*/strict weak ordering/], as defined in the `LessThanComparableConcept` requirements.
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* `ForwardRange`'s value type is the same type as `Value`.
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[*For the predicate versions:]
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* `ForwardRange` is a model of the __forward_range__ Concept.
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* `SortPredicate` is a model of the `StrictWeakOrderingConcept`.
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* `ForwardRange`'s value type is the same as `Value`.
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* `ForwardRange`'s value type is convertible to both of `SortPredicate`'s argument types.
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[heading Precondition:]
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For the non-predicate versions: `rng` is ordered in ascending order according to `operator<`.
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For the predicate versions: `rng` is ordered in ascending order according to `pred`.
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[heading Complexity]
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For random-access ranges, the complexity is `O(log N)`, otherwise the complexity is `O(N)`.
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[endsect]
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