std::set<Key,Compare,Allocator>::lower_bound

 

C++

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Technical Specifications

 

Containers library

array (C++11)

vector

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list

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std::set

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set::set

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set::get_allocator

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set::beginset::cbegin (C++11)

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set::empty

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Lookup

set::count

set::find

set::contains (C++20)

set::equal_range

set::lower_bound

set::upper_bound

Observers

set::key_comp

set::value_comp

Deduction guides(C++17)

 

iterator lower_bound( const Key& key );	(1)
const_iterator lower_bound( const Key& key ) const;	(1)
template< class K > iterator lower_bound(const K& x);	(2)	(since C++14)
template< class K > const_iterator lower_bound(const K& x) const;	(2)	(since C++14)

1) Returns an iterator pointing to the first element that is not less than key.

2) Returns an iterator pointing to the first element that compares not less to the value x. This overload only participates in overload resolution if the qualified-id Compare::is_transparent is valid and denotes a type. They allow calling this function without constructing an instance of Key.

Parameters

key	-	key value to compare the elements to
x	-	alternative value that can be compared to Key

Return value

Iterator pointing to the first element that is not less than key. If no such element is found, a past-the-end iterator (see end()) is returned.

Complexity

Logarithmic in the size of the container.

See also

equal_range	returns range of elements matching a specific key (public member function)
upper_bound	returns an iterator to the first element greater than the given key (public member function)