T& at( const Key& key );
const T& at( const Key& key ) const;
Returns a reference to the mapped value of the element with key equivalent to
key. If no such element exists, an exception of type std::out_of_range is thrown.
|key||-||the key of the element to find|
 Return value
Reference to the mapped value of the requested element
std::out_of_range if the container does not have an element with the specified
Logarithmic in the size of the container.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
|DR||Applied to||Behavior as published||Correct behavior|
 See also
| access or insert specified element |
(public member function)