Re: Math operations for NSNumber
Re: Math operations for NSNumber
- Subject: Re: Math operations for NSNumber
- From: Ken Tozier <email@hidden>
- Date: Thu, 31 May 2007 21:41:23 -0400
On May 31, 2007, at 8:01 PM, Nick Zitzmann wrote:
On May 31, 2007, at 5:31 PM, Ken Tozier wrote:
I know there are ways to extract C types from NSNumbers and
numerous functions in Math.h for performing calculations but why
doesn't NSNumber support calculations directly?
Because NSNumber is supposed to contain primitives in an array/
dictionary/set, not replace the primitives.
For example, say you have an NSArray of NSNumbers and you want to
convert them in-place to their nth root. If NSNumber supported
math functions, you could use NSArray's makeObjectsPerformSelector
method to do it without having to loop through each, extract the
value, get the root, and replace the number in the array.
There's nothing stopping you from writing your own method that does
this, is there?
I could do something that simulated it but without access to the
actual storage for the number, it would just add the overhead of
extracting the number converting it and replacing the instance. If
Apple did it on the other hand, they could perform the operation in
the actual storage without all that stuff.
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