object::operator[]
Access or insert an element.
Synopsis
value&
operator[](
string_view key);Description
Returns a reference to the value that is mapped to key. If such value does not already exist, performs an insertion of a null value.
If an insertion occurs and results in a rehashing of the container, all iterators including any past-the-end iterators, and all references to the elements are invalidated. Otherwise, no iterators or references are invalidated.
Complexity
Constant on average, worst case linear in size().
Exception Safety
Strong guarantee. Calls to memory_resource::allocate may throw.
Return Value
A reference to the mapped value.
Parameters
| Name | Description |
|---|---|
|
The key of the element to find. |