Fetches the next key/value pair in map.
Set idx to -1 to get started.
If the map is modified during iteration, the behavior is undefined.
The order in which the key/values are returned is undefined.
A map
Iterator internal state
Key retrieved
Value retrieved
true if there was a next value, false otherwise
Fetches the next key/value pair in map.
Set idx to -1 to get started.
If the map is modified during iteration, the behavior is undefined.
The order in which the key/values are returned is undefined.