From: kjana@...4lab.to (YANAGAWA Kazuhisa)
Date: 2002-10-08T20:53:22+09:00
Subject: Re: Clearing arrays etc. in extensions

In message <200210080230.g982UiY10524@sharui.nakada.kanuma.tochigi.jp>
nobu.nokada@softhome.net writes:

> > or simply set the len
> > field to 0.
> 
> If you modify an object directly, it's better to call
> rb_check_frozen().

Cheking whether frozen or not, in iteration or not, $SAFE permits
modifying the array or not.  Then set len 0, and resize the underlying
bin if necessary.

That's what done in rb_ary_clear(), implementing Array#clear and
is exported for C extension in intern.h :-)

I've look ruby-1.6.7 and -1.7.2.  Perhaps more older version also have
the external declaration.


-- 
kjana@dm4lab.to                                October 8, 2002
Out of sight, out of mind.