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61 lines
1.8 KiB
Plaintext
61 lines
1.8 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:binary_search binary_search]
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[heading Prototype]
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``
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template<class ForwardRange, class Value>
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bool binary_search(const ForwardRange& rng, const Value& val);
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template<class ForwardRange, class Value, class BinaryPredicate>
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bool binary_search(const ForwardRange& rng, const Value& val, BinaryPredicate pred);
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``
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[heading Description]
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`binary_search` returns `true` if and only if the value `val` exists in the range `rng`.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/binary_search.hpp`
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[heading Requirements]
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[*For the non-predicate versions of binary_search:]
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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 of binary_search:]
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* `ForwardRange` is a model of the __forward_range__ Concept.
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* `BinaryPredicate` is a model of the `StrictWeakOrderingConcept`.
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* `ForwardRange`'s value type is the same type as `Value`.
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* `ForwardRange`'s value type is convertible to `BinaryPredicate`'s argument type.
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[heading Precondition:]
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[*For the non-predicate version:]
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`rng` is ordered in ascending order according to `operator<`.
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[*For the predicate version:]
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`rng` is ordered in ascending order according to the function object `pred`.
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[heading Complexity]
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For non-random-access ranges, the complexity is `O(N)` where `N` is `distance(rng)`.
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For random-access ranges, the complexity is `O(log N)` where `N` is `distance(rng)`.
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[endsect]
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