Best practices for defining your own exception classes?

Question

I have some special exception cases that I want to throw and catch, so I want to define my own exception classes.

What are the best practices for that? Should I inh

Answer 1

It is a good when exception is placed in some scope. For instance class Manipulation can declare inside exception classes Error.

and catch them like

catch ( const Manipulation::InputError& error )
catch ( const Manipulation::CalculationError& error )

In such cases they can be just empty classes without any additional error information unless you design allows those exceptions fly much upper where you catch all standard exceptions.