How to create a bit array objective C

Question

I want to make a bit array or bit vector of items I have in an array so that I can create a binary fingerprint to compare to an object's fingerprint.

Here is an example:

Base fingerprint... All "available" colors

colorsArray[blue, red, white, green, orange];
Make this into a binary array (or whatever)
This is the result = masterPrint[1,1,1,1,1];
Now I have a separate object that has the colors red and blue in it (object[red,blue])
This object's fingerprint is object's print = [1,1,0,0,0];
Compare two prints, master print [1,1,1,1,1] and object print [1,1,0,0,0];
Result is two matches 40%

How can I accomplish this? Thank you

Shamsudheen TK · Accepted Answer · 2013-03-15 22:45:04Z

3

Better option is CFMutableBitVector

CFBitVector and its derived mutable type, CFMutableBitVector, manage ordered collections of bit values, which are either 0 or 1.

CFBitVector creates static bit vectors and CFMutableBitVector creates dynamic bit vectors.

See the class reference here

answered Mar 15, 2013 at 22:45

Shamsudheen TK

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8 Comments

William Falcon Over a year ago

I have read this reference but I am unsure as to how to take an array and parse it into this. Do you have any sample code? Thank you

Shamsudheen TK Over a year ago

here is the example github.com/llvm-mirror/lldb/blob/master/examples/summaries/…

Shamsudheen TK Over a year ago

if the answer helped you, please accept it. Do the code your own, then any issues occurred, post it as a good question. thanks

William Falcon Over a year ago

I will, I'm looking through it, it looks interesting, but there has to be an easier way, it looks like too much code just to add some values to a 1,0 array...

marko Over a year ago

Depending on your application, there might be an argument for using one of the many bit-vector implementations offered by C++ - which you can easily interwork with objective-c. Performance might be one very good reason for doing so, but an even stronger case might be the selection of high-performance algorithms you can apply to the data from the algorithm collection in STL.

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