At 03:47 PM 5/11/99 -0700, you wrote:
>a function pointer is (as should be obvious from the phrase) a pointer. so
>by declaring "Boolean oldTrap(FieldPtr, EventPtr);" you have already made
>oldTrap be a pointer. so sticking that extra "*" in the declaration of
>oldTrap is what's hosing you, because it turns "oldTrap" into a pointer to a
>pointer to a function, which is not what you want.
Some intermediate C:
Z RealFunction(X, Y); // declares a FUNCTION called "Function"
// that takes 2 arguments, an X and a Y
// and returns a Z.
Z (*DereferencedFunction)(X, Y); // declares a POINTER TO A FUNCTION
// that takes 2 arguments, an X and
// a Y and returns a Z.
Doing this:
Blah(X x, Y y)
{
DereferencedFunction = RealFunction;
RealFunction(x, y); // fine, but won't link
DereferencedFunction(x, y); // should break in the compiler
(*DereferencedFunction)(x, y); // calls RealFunction and dies
// (may get caught by the linker if it's
// not stupid)
}
