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94 lines
2.5 KiB
Plaintext
94 lines
2.5 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:lower_bound lower_bound]
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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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typename range_iterator<ForwardRange>::type
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lower_bound(ForwardRange& rng, Value val);
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template<
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range_return_value re,
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class ForwardRange,
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class Value
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>
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typename range_return<ForwardRange, re>::type
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lower_bound(ForwardRange& rng, 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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typename range_iterator<ForwardRange>::type
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lower_bound(ForwardRange& rng, Value val, SortPredicate pred);
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template<
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range_return_value re,
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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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typename range_return<ForwardRange,re>::type
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lower_bound(ForwardRange& rng, Value val, SortPredicate pred);
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``
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[heading Description]
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The versions of `lower_bound` that return an iterator, returns the first iterator in the range `rng` such that:
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without predicate - `*i < value` is `false`,
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with predicate - `pred(*i, value)` is `false`.
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`end(rng)` is returned if no such iterator exists.
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The versions of `lower_bound` 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/lower_bound.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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* `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 both of `BinaryPredicate`'s argument types.
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[heading Precondition:]
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[*For the non-predicate versions:]
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`rng` is sorted in ascending order according to `operator<`.
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[*For the predicate versions:]
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`rng` is sorted in ascending order according to `pred`.
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[heading Complexity]
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For ranges that model the __random_access_range__ concept the complexity is `O(log N)`, where `N` is `distance(rng)`.
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For all other range types the complexity is `O(N)`.
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[endsect]
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