Re: function pointer

[Richard Frith-Macdonald]

On 31 Jul 2006, at 15:30, hns@computer.org wrote:

> > I want to set a function pointer passing it to an object. I think it
> > would be something like this
> >
> > -(int) setPotential: (double)(*potential)(double r, void * par);
> The correct syntax of Objective-C should be which makes it impossible
> to specify function pointers directly:

I don't understand the above sentence.

I guess what you mean is that the format for specifying the type of a  
method argument in objective-C is identical to the way you specify a  
typecast in C.

eg. where in C you might say

 (double (*)(double r, void * par)) aPointer

to cast aPointer to be of type '(double (*)(double r, void * par))'

and in Objective-C you might say

- (id) aMethodName: (double (*)(double r, void * par)) anArgument;

to declare anArgument to be a value of type '(double (*)(double r,  
void * par))'