mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-31 04:50:34 -04:00
38 lines
1.0 KiB
Plaintext
38 lines
1.0 KiB
Plaintext
[/
|
|
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:count_if count_if]
|
|
|
|
[heading Prototype]
|
|
|
|
``
|
|
template<class SinglePassRange, class UnaryPredicate>
|
|
typename range_difference<const SinglePassRange>::type
|
|
count_if(const SinglePassRange& rng, UnaryPredicate pred);
|
|
``
|
|
|
|
[heading Description]
|
|
|
|
`count_if` returns the number of elements `x` in `rng` where `pred(x)` is `true`.
|
|
|
|
[heading Definition]
|
|
|
|
Defined in the header file `boost/range/algorithm/count_if.hpp`
|
|
|
|
[heading Requirements]
|
|
|
|
* `SinglePassRange` is a model of the __single_pass_range__ Concept.
|
|
* `UnaryPredicate` is a model of the `UnaryPredicateConcept`.
|
|
* `SinglePassRange`'s value type is a model of the `EqualityComparableConcept`.
|
|
* The value type of `SinglePassRange` is convertible to the argument type of `UnaryPredicate`.
|
|
|
|
[heading Complexity]
|
|
|
|
Linear. Exactly `distance(rng)` invocations of `pred`.
|
|
|
|
[endsect]
|
|
|
|
|