Defines the interface through which the Handler notifies subscribers about Handler state change event...
std::string toString() const
String representation.
HandlerState oldState() const
Old state.
void toString(std::string &) const
Appends string representation.
HandlerStateChange(HandlerState newState, HandlerState oldState)
Initialize instance.
HandlerState newState() const
New State.
HandlerStates::Enum HandlerState
States of the Handler in which it may reside.
std::ostream & operator<<(std::ostream &, const Error &)
Make it printable to formatted C++ I/O streams.