C++: Throwing an exception invokes the copy constructor?

Question

We have an custom error class that is used whenever we throw an exception:

class AFX_CLASS_EXPORT CCLAError : public CObject

It has the fol

Answer 1

However, I do not understand why re-throwing a caught exception would invoke the copy constructor.

It doesn't, but re-throwing the thrown exception is done with throw;. When you do throw e; you are requesting to throw a copy of the caught exception.