On 13 Aug 2008, at 00:05, Jason Coco wrote:
On Aug 12, 2008, at 12:50 , Klaus Backert wrote:
About $Null:
It it were a reserved word, it would be documented so.
The "Archives and Serializations Programming Guide for Cocoa" says:
Keyed Archives
...
Naming Values
...
You should avoid using “$” as a prefix for your keys. The keyed
archiver and unarchiver use keys prefixed with “$” for internal
values. Although they test for and mangle user-defined keys that
have a “$” prefix, this overhead slows down archiving performance.
...
In this case, however, it's the actual value being encoded... not
the key name. Also, if you read it, it suggests that you shouldn't
use it for performance reasons. It specifically states that it is
supposed to properly mangle the $ in a key name (causing the
performance loss)...
Also: this "testing for and mangling" overhead, which might "slow
down archiving performance" consists of:
in: if user_key starts with '@' then prepend another '@'
out: if key starts with '@@' remove one '@'.
Would be interesting to know, how much this really slows down the
performance.
Kind regards,
Gerriet.
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