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Home » U++ Library support » U++ Callbacks and Timers » How to disable a callback?
How to disable a callback? [message #14646] Wed, 05 March 2008 19:27 Go to next message
indiocolifa is currently offline  indiocolifa
Messages: 48
Registered: January 2008
Location: Argentina
Member
Suppose I "connect" a function to a class using callbacks:

Class.WhenBLAH = THISBACK(fn);


Now, I need to temporarily disable this callback, altough I've not found a suitable "null" value for the Callback type. The following obviously do not work so far:

Class.WhenBLAH=THISBACK(NULL);
Class.WhenBLAH=NULL;


Both are incompatible with Upp::Callback.

How I can do this?

[Updated on: Wed, 05 March 2008 19:28]

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Re: How to disable a callback? [message #14648 is a reply to message #14646] Wed, 05 March 2008 20:04 Go to previous message
cbpporter is currently offline  cbpporter
Messages: 1358
Registered: September 2007
Senior Contributor
indiocolifa wrote on Wed, 05 March 2008 20:27

Suppose I "connect" a function to a class using callbacks:

Class.WhenBLAH = THISBACK(fn);


Now, I need to temporarily disable this callback, altough I've not found a suitable "null" value for the Callback type. The following obviously do not work so far:

Class.WhenBLAH=THISBACK(NULL);
Class.WhenBLAH=NULL;


Both are incompatible with Upp::Callback.

How I can do this?


You can use Class.WhenBLAH = Callback() to denote a "null" callback, as in no action.
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