Re: NSMutableAttributedString, NSFontAttributeName, and reference counting
Re: NSMutableAttributedString, NSFontAttributeName, and reference counting
- Subject: Re: NSMutableAttributedString, NSFontAttributeName, and reference counting
- From: Nick Zitzmann <email@hidden>
- Date: Sun, 11 Jan 2009 21:34:31 -0700
On Jan 11, 2009, at 7:59 PM, Michael A. Crawford wrote:
If I allocate a font object for use with NSMutableAttributedString
and assign said font to the string using the addAttribute method,
will the reference count on the font be incremented? (I assume that
if the answer is yes, then removeAttribute will decrement the
reference count.)
Yes, on Leopard & presumably later. On Tiger & earlier, technically
no, because NSFont objects followed different rules back then; they
were always around. The Leopard AppKit release notes state this.
As a bonus question, can I observe this in the debugger (seems like
a useful skill in order to avoid similar questions along these lines
in the future)? If so, how is that accomplished.
Use Instruments instead of GDB. Its object alloc tracker can
optionally log retains and releases.
Nick Zitzmann
<http://www.chronosnet.com/>
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