Passing float "byref" in Objective C?

Question

Is there a way to pass a float "byref" to a method in objective C? Here's an overview of what I've got:

method signature:

- (void) MyMethod: (float*) min max:(float*) max;

method:

- (void) MyMethod: (float*) min max:(float*) max
{
}

trying to invoke it:

float min1 = 0; float max1 = 0; 
[self MyMethod: min:&min1 max:&max1];

I get the following warning, and the code abends when trying to invoke MyMethod:

warning: 'MyClass' may not respond to '+MyMethod:min:max:'

Answer 1

The signature for your method is declared as

- (void) MyMethod: (float*) min max:(float*) max

but you are calling it as

- MyMethod:min:max:

... which includes an extra 'min:' that's not in the declaration.

Try changing your calling code to

float min1 = 0; float max1 = 0; 
[self MyMethod:&min1 max:&max1];

and see if that improves things.

However, I see that your error message complains about the signature '+ MyMethod:min:max:', which also suggests you're trying to send the message to the class rather than an instance of the class; you will have to rectify that.

Finally, method selectors in Objective-C code usually start with a lower-case letter; you might want to read up on common Objective-C naming conventions.