From: Andre Nathan <andre@...>
Date: 2008-01-08T10:34:03+09:00
Subject: Re: Using "sort!" in a C extension (1.9 problem)

On Tue, 2008-01-08 at 09:34 +0900, Yukihiro Matsumoto wrote:
> In general, if you want to get multiple values from yield, you have to
> use arguments added in 1.9:
> 
> static VALUE
> sort_i(VALUE a1, VALUE a2, int argc, VALUE *argv)
> {
>     long v1 = FIX2LONG(RARRAY_PTR(argv[0]));
>     long v2 = FIX2LONG(RARRAY_PTR(argv[1]));
>     return LONG2FIX(v1 - v2);
> }
> 
> You may need to check argc if they are variable.

Thanks Matz, Kubo helped me sorting this out.

Is there any situation where a1 will be different from argv[0] other
than the case Guy mentioned (argc == 0, and this argv[0] doesn't exist)?

Best,
Andre