Constructor. The passed list of allowed keys is shallow copied into the keys class member.
Support for the 'in' operator
Exception instance
foreach operator over keys in the map.
foreach operator over keys and values in the map.
foreach operator over keys, values and indices in the map.
Checks whether a key is in the map, and returns a pointer to the corresponding value, or null if the key does not exist.
Gets a value for a key.
Sets a value for a key.
Fixed key map class template.