From: Andre Nathan <andre@...>
Date: 2007-12-30T02:49:47+09:00
Subject: Using "sort!" in a C extension (1.9 problem)

Hello

In ruby 1.8, I could use Array#sort! in a C extension like this:

static VALUE
call_sort_bang(VALUE ary)
{
    return rb_funcall(ary, rb_intern("sort!"), 0);
}

static VALUE
sort_i(VALUE ary)
{
    long v1 = FIX2LONG(RARRAY_PTR(ary)[0]);
    long v2 = FIX2LONG(RARRAY_PTR(ary)[1]);
    return LONG2FIX(v1 - v2);
}

static VALUE
foo(void)
{
    VALUE ary = rb_ary_new();
    rb_ary_push(ary, INT2FIX(1));
    rb_ary_push(ary, INT2FIX(0));
    rb_ary_push(ary, INT2FIX(2));
    rb_iterate(call_sort_bang, ary, sort_i, 0);
    rb_funcall(rb_mKernel, rb_intern("p"), 1, ary);
    return a;
}

This would print "[0, 1, 2]" as expected. However, it doesn't work in
ruby1.9 compiled from svn (checked out today). The problem seems to be
that only one of the array elements is being passed to sort_i(), instead
of a pair of elements as it's done in 1.8.

What is the correct way to do this in 1.9?


Thanks in advance,
Andre