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NSMutableString appendString: "appending self" allowed?
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NSMutableString appendString: "appending self" allowed?


  • Subject: NSMutableString appendString: "appending self" allowed?
  • From: Manfred Schwind <email@hidden>
  • Date: Thu, 30 Aug 2007 06:46:14 +0200

Hi,

is the following call allowed?

[someMutableString appendString:someMutableString];

It effectively appends a given string to itself, so that it gets doubled. (E.g. "Oh" will become "OhOh" etc.)

It works at least on 10.4.10, but it's not documented wether I can use the receiver as parameter in the appendString selector for NSMutableString. Can someone (maybe from Apple) approve that this works also for older system versions?
I can think of strange side effects when appending a string to itself, depending on the internal implementation.


Or should I better use this:

[someMutableString appendString:[[someMutableString copy] autorelease]];

or

[someMutableString appendString:[someMutableString subStringToIndex: [someMutableString length]]];

or something like that?

Regards,
Mani
--
http://www.mani.de
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