Returns the bounds of a range that includes all the elements in the
container with a key that compares equal to key.
In map containers,
where no duplicate keys are allowed, the range will include one
element at most. If key does not match any key in the container, the range
returned has a length of zero.
Returns the bounds of a range that includes all the elements in the container with a key that compares equal to key.
In map containers, where no duplicate keys are allowed, the range will include one element at most. If key does not match any key in the container, the range returned has a length of zero.