Inform - Support - Patches

About Patches  


DM4 Errata  

Issue C62106

Indirect call doesn't set "self"
Submitted by: Brendan Barnwell and L Ross Raszewski     Appeared in: Compiler 6.21 or before     Fixed in: -

Normally, if your code calls a property routine using obj.prop(), then in the obj.prop routine the "self" variable will be set to obj. However, if you call the routine indirectly, like this:


..."self" will not be set correctly (it will retain the value it has in the calling routine).


None submitted.

Update (by Eric Schmidt)

This isn't a bug, because you are not sending a message. Notice that the code will crash if prop is not a routine, while a message send would either print the string if the value is a string, or return it if not. The obj.prop(args) format is required for a message send. What the code example does is store obj.prop (the address of the routine) in a. It then calls the routine at the address stored in a.

Update (by Cedric Knight)

It seems deliberate that the veneer works this way, and IMHO it shouldn't be changed, just better documented.

Last updated 17 April 2013. This web site has not been fully supported since April 2008. Information may be out of date. This page was originally managed by Roger Firth.