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template< class ForwardRange, class Value > typename range_iterator<ForwardRange>::type lower_bound(ForwardRange& rng, Value val); template< range_return_value re, class ForwardRange, class Value > typename range_return<ForwardRange, re>::type lower_bound(ForwardRange& rng, Value val); template< class ForwardRange, class Value, class SortPredicate > typename range_iterator<ForwardRange>::type lower_bound(ForwardRange& rng, Value val, SortPredicate pred); template< range_return_value re, class ForwardRange, class Value, class SortPredicate > typename range_return<ForwardRange,re>::type lower_bound(ForwardRange& rng, Value val, SortPredicate pred);
The versions of lower_bound
that return an iterator, returns the first iterator in the range rng
such that: without predicate -
*i
< value
is false
, with predicate
- pred(*i, value)
is false
.
end(rng)
is returned if no such iterator exists.
The versions of lower_bound
that return a range_return
,
defines found
in the
same manner as the returned iterator described above.
Defined in the header file boost/range/algorithm/lower_bound.hpp
For the non-predicate versions:
ForwardRange
is a
model of the Forward
Range Concept.
Value
is a model
of the LessThanComparableConcept
.
Value
is a strict weak ordering,
as defined in the LessThanComparableConcept
requirements.
ForwardRange
's value
type is the same type as Value
.
For the predicate versions:
ForwardRange
is a
model of the Forward
Range Concept.
BinaryPredicate
is
a model of the StrictWeakOrderingConcept
.
ForwardRange
's value
type is the same type as Value
.
ForwardRange
's value
type is convertible to both of BinaryPredicate
's
argument types.
For the non-predicate versions:
rng
is sorted in ascending
order according to operator<
.
For the predicate versions:
rng
is sorted in ascending
order according to pred
.
For ranges that model the Random
Access Range concept the complexity is O(log N)
,
where N
is distance(rng)
.
For all other range types the complexity is O(N)
.