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51 lines
1.4 KiB
Plaintext
51 lines
1.4 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:find_if find_if]
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[heading Prototype]
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``
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template<class SinglePassRange, class UnaryPredicate>
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typename range_iterator<SinglePassRange>::type
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find_if(SinglePassRange& rng, UnaryPredicate pred);
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template<
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range_return_value re,
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class SinglePassRange,
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class UnaryPredicate
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>
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typename range_return<SinglePassRange, re>::type
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find_if(SinglePassRange& rng, UnaryPredicate pred);
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``
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[heading Description]
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The versions of `find_if` that return an iterator, returns the first iterator in the range `rng` such that `pred(*i)` is `true`. `end(rng)` is returned if no such iterator exists.
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The versions of `find_if` that return a `range_return`, defines found in the same manner as the returned iterator described above.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/find_if.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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* `UnaryPredicate` is a model of the `PredicateConcept`.
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* The value type of `SinglePassRange` is convertible to the argument type of `UnaryPredicate`.
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[heading Precondition:]
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For each iterator `i` in `rng`, `*i` is in the domain of `UnaryPredicate`.
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[heading Complexity]
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Linear. At most `distance(rng)` invocations of `pred`.
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[endsect]
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