Johannes Zmölnig wrote:

Matteo.sistisette wrote:

...

Often, when I get an error, such as for example "inlet: no method for 'list'", and I do a "Find last error", I get the message: ...sorry, I couldn't find the source of last error

then there is a 2nd type of error message, which links a message to a certain object. when an object uses this special kind of error message, you will be able to track the error with the "find last error" menu. a C-programmer can often choose to use one of these variants; using the 2nd method is a tiny bit more complicated (and requires more typing); this is most likely the reason why people do not explicitely use it.

A while ago, I started replacing all error() calls by pd_error() calls so that error messages can be located better. However, I am considering removing pd_error() completely instead, using a system of dynamic variables (in LISP parlance).

A dynamic variable is like a global variable that is being used as local by backing up and restoring the contents of the variable whenever appropriate. Most of the time this is equivalent to lexical variables (the other kind of local variables) but in this case this also allows one to use the contents of the variable as set by the caller, or the caller of the caller, or whoever set the variable last (in terms of levels of nesting). This makes pd_error() useless, as any error() call can look up the variable that indicates the currently deepest method activation (last message received that isn't yet finished handling). This allows accurate error-reporting from functions that don't have a "this" parameter and have no idea what it could be.

I introduced this feature in GridFlow a long time ago. (currently it's not in GridFlow anymore, for reasons that are long to explain, but I still think that it's a good idea)

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