Storing NaN in property list (plist) file

Question

Is it possible to store a NaN in a property list file. I tried:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
     <integer>nan</integer>
</array>
</plist>

But Xcode was not able to phrase the file. Any thoughts?

Monolo · Accepted Answer · 2012-06-16T07:52:55.813

3

Floats or doubles can be NaNs, but an integer can not.

Also not sure if you can store it in a plist file.

However, if you use NSUInteger for your integer, you can use a predefined marker like NSNotFound, or you can define your own value that you want to reserve for the purpose.

edited Jun 16 '12 at 07:52

answered Jun 16 '12 at 06:22

Monolo

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If you codes the plist by hand (instead of writing it to file in code), type the value -1. NSNotFound is defined as -1, or the same bit pattern as the largest possible unsigned integer. – Nicolas Miari Jun 16 '12 at 06:56

score 2 · Answer 2 · answered Jun 16 '12 at 08:24

2

Yes, for example a dictionary with a NaN value for the key "A_NaN_Value":

<dict>
   <key>A_NaN_Value</key>
   <real>nan</real>
</dict>

answered Jun 16 '12 at 08:24

CRD

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Storing NaN in property list (plist) file

2 Answers2