std::set<Key,Compare,Allocator>::equal_range
std::pair<iterator,iterator> equal_range( const Key& key ); |
(1) | |
std::pair<const_iterator,const_iterator> equal_range( const Key& key ) const; |
(2) | |
template< class K > std::pair<iterator,iterator> equal_range( const K& x ); |
(3) | (since C++14) |
template< class K > std::pair<const_iterator,const_iterator> equal_range( const K& x ) const; |
(4) | (since C++14) |
Returns a range containing all elements with the given key in the container. The range is defined by two iterators, one pointing to the first element that is not less than key
and another pointing to the first element greater than key
. Alternatively, the first iterator may be obtained with lower_bound(), and the second with upper_bound().
key
.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
. This section is incomplete Reason: explain better |
Parameters
key | - | key value to compare the elements to |
x | - | alternative value that can be compared to Key
|
Return value
std::pair containing a pair of iterators defining the wanted range: the first pointing to the first element that is not less than key
and the second pointing to the first element greater than key
.
If there are no elements not less than key
, past-the-end (see end()) iterator is returned as the first element. Similarly if there are no elements greater than key
, past-the-end iterator is returned as the second element.
Complexity
Logarithmic in the size of the container.
Example
See also
finds element with specific key (public member function) | |
returns an iterator to the first element greater than the given key (public member function) | |
returns an iterator to the first element not less than the given key (public member function) |