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classes & function pointers

Started by Themis Jan 20, 2003 at 2:59 PM 0 replies 250+ views

Original Post

Jan 20, 2003 at 2:59 PM

Hello, I want to ask about pointers to functions in C++. When I want to use a function pointer in C I use a simple typedef like the following: typedef int (*pFunc)(void *); and then I give as an argument the name of a proper function in another one. My problem is that if the function whose pointer I want to give is an object''s method then the compiler starts complaining. eg. void foo(int x, pFunc func); class cClass { int myFunc(void *x); }; int main() { cClass myClass; int x=0; foo(x, myClass.myFunc); //compiler complaints return 0; } -------------------------------------------------------------------------------- How can I overcome this problem? I ''ve tried to typecast the method eg foo(x, (pFunc)myClass.myFunc); but this as you might know doesn''t work

. Can you help me with this? Thanks, Themis

Burning_Ice

Jan 20, 2003 at 4:16 PM

your best source for information on this is http://www.function-pointer.org/
to make it short:

  
typedef void ( myclass::*FUNC ) ( int );
myclass obj;				// instantiate myclass

FUNC f = obj.myfunc;			// assign adress

( obj.*f ) ( 123 );			// and call it

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