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???
11/09/07 17:37
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 		 #146819 - I use function pointers all the time
Responding to: ???'s previous message
It's a great technique for implementing UI code (E.g. LCD + Keypad) without a massive switch statement or state machine or similar.

Here is my declaration:
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void (*pUIFocus)();     // Holds the addr of the current menu func.


Here is setting the UI to the main menu:
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pUIFocus = UIMain;      // Set the UI context.


Here is my UI code being executed in the main program loop:
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// Execute the current UI context.
(*pUIFocus)();


Then each UI menu is in it's own C file (if there are a lot of them). Each UI has an initialzation routine which sets up any variables or hardware and then sets the context. This is pretty common stuff.

I can't recall using pointers to pointers on a '51 but I may have. I definitely don't do anything that uses a heap. And for those that complain that this might be slow (it isn't), you might want to stay away from things like printf().




List of 11 messages in thread
TopicAuthorDate
C : pointers of function und pointers of pointers            01/01/70 00:00      
   Function pointers and stuff            01/01/70 00:00      
   Parameter passing in C            01/01/70 00:00      
   C FAQ            01/01/70 00:00      
   Function pointer demo            01/01/70 00:00      
      Heads up            01/01/70 00:00      
         True            01/01/70 00:00      
            I use function pointers all the time            01/01/70 00:00      
               void-void function pointers need not be slow            01/01/70 00:00      
                  correct, with a caveat            01/01/70 00:00      
   thank you all.            01/01/70 00:00      

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