[PURRS-devel] Exceptions.

Hi.

I have problems in understanding GiNaC policy regarding the choice of exceptions thrown.

The operator `operator/' defined on objects of the class `numeric' throws a `runtime_error' in the case of a division by zero. In contrast, the `operator/' defined on objects of the class `ex' throws a `logic_error' in the case of a division by zero.

Why is there such a difference?

According to the standard, the exception `logic_error' should be used when errors could have been detected before program execution: I thus believe that a `runtime_error' should be thrown even in the case of an `ex' object.

The same argument hold for the exception thrown by `power': logic_error: power::eval(): division by zero.

Thanks Tatiana Zolo