Question

This is Objective-C, in Xcode for the iPhone.

I have a method in main.m:

int main(int argc, char *argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

//I want to call the method here//

int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];
return retVal;
}

static BOOL do_it_all () {
//code here//
}

How do I call the do_it_all method from main.m?

Answer 1

You can call it normally, so long as you’ve already declared the function before you call it. Either move the function definition above main() or add the following line above:

static BOOL do_it_all ();

Personally, I think the former is easier, but if you have circular dependencies between functions, it can be impossible to resolve without function prototypes.

When you do add function prototypes in C/Objective-C/etc. they are frequently in a header (.h) file, but if everything is in main.m this is probably overkill.