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An Objective-C wrapper for the GMP library at http://gmplib.org/.
by Brian Morton - bmorton@sdreader.com
Copyright (c) 2011 The San Diego Reader. All rights reserved.

This wrapper will allow you to use basic functionality of the GMP
C library in Objective-C.  Look at the header file for the methods
available.

Here's an example of how to use this:

GMPInt *myInteger = [[GMPInt alloc] initWithUnsignedLong:2];
[myInteger isPrime]; // should return true
[myInteger nextPrime]; // will set value to 3

// Perform 3^1000000
[myInteger powerWithUnsignedLong:1000000];

// Multiply a GMPInt with another
GMPInt *secondInteger = [[GMPInt alloc] initWithUnsignedLong:10];
[secondInteger powerWithUnsignedLong:100000];
// myInteger = myInteger * secondInteger
[myInteger multiplyWithGMP:secondInteger];

// Generate string from integer
NSString *myString = [myInteger stringValue];


To use this with Xcode 4:

1.	Install brew if you don't already have it:
	https://github.com/mxcl/homebrew
	
2.	Run "sudo brew install gmp"

3.	Add these files to your Xcode project.

4.	In Xcode, click on your project file and goto your target.

5.	Goto the "Build Phases" tab and click "+" under "Link Binary with
	Libraries."

6.	Add libgmp.dylib.  If you don't see it, navigate to /usr/local and
	dig around to find it.  Mine is in /usr/local/Cellar/gmp/5.0.1/lib
	and is symlinked in /usr/local/lib.
	

And some legal stuff:

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.