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42 lines
1.1 KiB
Plaintext
42 lines
1.1 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:count count]
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[heading Prototype]
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``
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template<class SinglePassRange, class Value>
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typename range_difference<SinglePassRange>::type
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count(SinglePassRange& rng, const Value& val);
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template<class SinglePassRange, class Value>
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typename range_difference<const SinglePassRange>::type
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count(const SinglePassRange& rng, const Value& val);
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``
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[heading Description]
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`count` returns the number of elements `x` in `rng` where `x == val` is `true`.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/count.hpp`
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[heading Requirements]
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* `SinglePassRange` is a model of the __single_pass_range__ Concept.
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* `Value` is a model of the `EqualityComparableConcept`.
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* `SinglePassRange`'s value type is a model of the `EqualityComparableConcept`.
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* An object of `SinglePassRange`'s value type can be compared for equality with an object of type `Value`.
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[heading Complexity]
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Linear. Exactly `distance(rng)` comparisons.
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[endsect]
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