Hola Pablo,

This technique is not something new, it was reported at least +20 years ago. You can read about it in a SO answer I wrote; http://stackoverflow.com/a/14202534 where there is a link to a foundational paper.
Let us know what are you trying to do.

Cheers,

Hern��n


2017-03-03 10:07 GMT-03:00 Pablo R. Digonzelli <pdigonzelli@gmail.com>:
Hi all. I need to know how can i do if i want add new behaviour ( a new method ) to a single instance object of a class.��
It means not to add new selector to the class but i want a single instance responds that mesage.��
Where can i read about it?
Tia

Ing. Pablo Digonzelli
Software Solutions
IP-Solutiones SRL
Dividato SA����������������
25 de Mayo 521
San Miguel de Tucum��n