Re: [Pyobjc-dev] Displaying HTML in NSTextView

[Ronald O. <ous...@ci...>]

On Friday, Jul 4, 2003, at 11:10 Europe/Amsterdam, Dinu Gherman wrote:

> Ronald Oussoren:
>
>> The signature is: (NSData, NSURL) -> (self, attributes), the
>> documentAttributes is an output argument.
>
> I found this out by experimenting myself... It raises maybe an inter-
> esting issue: what if an argument is used as input *and* output ar-
> gument? Is there a general policy being followed behind returning
> compound results, or is this a case-by-case decission?

There is a general rule:

- If a pointer is an input argument you should pass a value
- If a pointer is an output argument you shouldn't pass a value and the 
value is added to the return value (which get's turned into a tuple 
like this: (method_return, output1, output2, ...)
- If a pointer is both an input and an output: pass a value for input, 
the output is returned as with output-only arguments.

Ronald