each

/*
 *  call-seq:
 *     rng.each {| i | block } => rng
 *  
 *  Iterates over the elements <i>rng</i>, passing each in turn to the
 *  block. You can only iterate if the start object of the range
 *  supports the +succ+ method (which means that you can't iterate over
 *  ranges of +Float+ objects).
 *     
 *     (10..15).each do |n|
 *        print n, ' '
 *     end
 *     
 *  <em>produces:</em>
 *     
 *     10 11 12 13 14 15
 */

static VALUE
range_each(range)
    VALUE range;
{
    VALUE beg, end;

    beg = rb_ivar_get(range, id_beg);
    end = rb_ivar_get(range, id_end);

    if (!rb_respond_to(beg, id_succ)) {
        rb_raise(rb_eTypeError, "can't iterate from %s",
                 rb_obj_classname(beg));
    }
    if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
        long lim = FIX2LONG(end);
        long i;

        if (!EXCL(range)) lim += 1;
        for (i=FIX2LONG(beg); i<lim; i++) {
            rb_yield(LONG2NUM(i));
        }
    }
    else if (TYPE(beg) == T_STRING) {
        VALUE args[5];
        long iter[2];

        args[0] = beg; args[1] = end; args[2] = range;
        iter[0] = 1; iter[1] = 1;
        rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i,
                   (VALUE)iter);
    }
    else {
        range_each_func(range, each_i, beg, end, NULL);
    }
    return range;
}