Re: using selectors

[Marcus G. Daniels]

>>>>> "JM" == James Marshall <address@hidden> writes:

JM> Maybe I should be trying to use the perform method with a selector
JM> and argument instead, but I'm not sure how I'd do that in this
JM> case?  Someone please give me the correct syntax! 

It isn't a question of syntax.  EZGraph just isn't set up to pass arguments
to it's selector.

If you use ActiveGraph directly, and call setArg:ToString: with
stringified versions of the integers arguments you wanted, then you
could sort of do it.  (ugh, gross!)

And if you are really in a wicked mood, you could encapsulate the index in
a closure, along these lines...

#include <objc/objc-api.h>
#include <objc/Object.h>

void
replace_imp (Class class, SEL sel, IMP imp)
{
  Method_t method = class_get_instance_method (class, sel);
  
  method->method_imp = (IMP)imp;
#if 0
  __objc_install_premature_dtable (class);  /* GCC < 2.8 */
#else
  class->dtable = objc_get_uninstalled_dtable ();  /* GCC >= 2.8 */
#endif
}

@interface Test: Object
- run;
@end

@implementation Test
- run
{
  printf ("Default Behavior\n");

  return self;
}

- runValue: (int)i
{
  static updatedFlag = NO;

  id func (id self, SEL aSel)
    {
      printf ("Behavior#: %d\n", i);

      return self;
    }
  if (!updatedFlag)
    {
      replace_imp ([self class], @selector (run), (IMP)func);
      updatedFlag = YES;
    }

  [self run];
}

@end

main ()
{
  id obj = [[Test alloc] init];
  int i;

  for (i = 0; i < 5; i++)
    [obj runValue: i];
}


/*
Local Variables:
compile-command: "gcc -g closure.m -lobjc -o closure"
End:
*/

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