This class is an Objective-C wrapper around a c auto-growing pointer array.
I built this library because I'm rewriting RouletteBetter and I wanted a way to make lot of statistics calculation on vectors. To do so, we can use the iOS Accelerate framework to 'Make large-scale mathematical computations and image calculations, optimized for high performance'. Unfortunately the Accelerate framework wants basic c pointer array as input/output parameters, so we can't use NSMutableArray or high level NSObjects.
With this wrapper library, we can easily create and manupulate the c pointer array as an high level object and, whenewer we need it, access the low level pointer property (for example to pass it to the Accelerate framework c functions).
To run the example project, clone the repo, and run pod install from the Example directory first.
Example usage:
// create and fill the array as an high level object
DZAUnsafeMutableArray * unsafeArray = [[DZAUnsafeMutableArray alloc] initWithCapacity:10];
for (int i = 0; i < 10; i++)
{
[unsafeArray addInt:i];
}
// access an element of the array
int element = [unsafeArray intAtIndex:3];
// remove the last object
[unsafeArray removeLastObject];
// shrink the array to the new size
[unsafeArray shrinkToSize:5];
// low-level access to the c pointer array
int * pointer = unsafeArray.intUnsafePointer;
// iterate all the items and manually sum a scalar
for (int i = 0; i < unsafeArray1.count; i++, pointer++)
{
*pointer += SCALAR;
}
// use the c pointer array with Accelerate framework:
// sums a scalar to the entire vector
int scalar = 3;
vDSP_vsaddi(unsafeArray.intUnsafePointer, 1, &scalar, unsafeArray.intUnsafePointer, 1, unsafeArray.count);A small benchmark app is included:
DZAUnsafeMutableArray is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod "DZAUnsafeMutableArray"Davide Di Stefano, dzamirro@gmail.com
DZAUnsafeMutableArray is available under the MIT license. See the LICENSE file for more info.