cpp: interface with exceptions

[ftynse]

What would be the best way to add support for exceptions in the interface? Generate different bindings with a flag to generator?

Ideally, I would like to have meaningful messages inside exceptions. For example, include messages passed to isl_die. The main problem is that internal memory management relies on the errors being propagated until the user call through isl_stat/isl_bool or null pointers to do some cleenups. So we cannot just throw on isl_die. We could try to copy the message into the isl_ctx and then query it, similarly to errno in POSIX. This would complicate the wrapper functions and make them do the following:

• find the ctx of their arguments;
• do the call and check if it did not return error/null (except if marked as __isl_null);
• if did return error, query the context and throw
• stack unwinding should take care of clearing the relevant C++ wrappers.
  This requires that all functions that may fail could obtain the context from their arguments. Is this the case?

Any other thoughts?

[tobiasgrosser]

AFAIK Sven started to look into this as well. Maybe also ask this on the isl mailing list?