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Re: [Xotcl] full trace support for XOTcl methods/procs

From: Eckhard Lehmann <>
Date: Tue, 01 Jan 2008 13:33:54 +0100

Happy New Year!

> > I know there are filters, but I am looking for an easier way to

> Why not use filters with filterguards? I would've thought that would
> be the exact mechanism required.

Yes, it would be possible to do it that way, but it is very complicated:
- Register a filter that is by default applied to _all_ instprocs
- restrict the appliance of this filter via a filterguard

Sounds like "shooting from behind through the brest into the eye". Why not simply add/remove execution of code to particular methods, like with [trace]? There is already a [trace] method for XOTcl objects, but just for variables (at least from the documentation)...
Especially I look for a way to execute a proc before *every* statement inside an instproc. [trace] can do this via the "enterstep" and "leavestep" operators to [trace add execution]. Is this possible with filters and filterguards?


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