createTagged method
Method that checks if instance is already in singleton map
before creating new instance of T
Implementation
@override
T? createTagged(String? tag) {
if (tag == null) {
return _handleDefault();
}
var localInstance = taggedSingletons[tag];
if (localInstance == null) {
localInstance = createForTag(tag);
if (localInstance == null) {
taggedSingletons.remove(tag);
} else {
taggedSingletons[tag] = localInstance;
}
}
return localInstance;
}