Return a modifiable reference to the mapped value for key.
Return a reference providing modifiable access to the mapped-value associated with the specified key, if such an entry exists; otherwise, throw a std::out_of_range exception. Note that this method may also throw a different kind of exception if the (user-supplied) comparator throws.
modifiable reference to the mapped value
| Name | Description |
|---|---|
| key | key whose mapped value is accessed |