Hi Csaba,

In a compliant C compiler you would write:

// Declare a pointer to a function taking a single char arg and no return
type
typedef void (*VoidFuncPtrType)(char);

// Create a function pointer (use in a struct etc)
VoidFuncPtrType pMyFunctionPointer;

// Implement a function that can be assigned to this pointer
// You could also forward declare this and implement it later
void MyFunction( char index )
{
...
}

// Assign my function to the pointer using the "address" of the function
pMyFunctionPointer = &MyFunction;

// Call the function through the pointer.
pMyFunctionPointer( 1 );

Does that help?

The big question is does your PIC compiler actually support function
pointers :)

Cheers,
Ash.

---
Ashley Roll
Digital Nemesis Pty Ltd
www.digitalnemesis.com
Mobile: +61 (0)417 705 718




> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Also-Antal Csaba
> Sent: Monday, 4 February 2002 9:39 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [pic]: predec
>
>
> How can I pre declarate the 'menu' function? This code give
> this linker
> (?) error:
>
> ::undefined symbol: (error)
> ::?_menu (main.obj) (error)
>
> udv
> Csaba
>
> //menu definitions
>
> typedef void voidfunc(char index);
> typedef voidfunc *fad;
>
> voidfunc menu;
>

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