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A relatively complete sparse array implementation in objective-c for Mac or iOS.

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DSSparseArray and DSMutableSparseArray

These classes provide sparse array functionality for objective-c. They manage ordered collections of objects that are similar to regular arrays but can hold nil entries. The efficiency comes from the fact that a nil entry takes no space, it simply does not exist. They should be able to be used anyplace an NSArray or NSMutableArray is used but, unless the arrays actually have empty entries, are less efficient.

DSSparseArray provides immutible array functionality that can contain empty or nil entries.

DSMutableSparseArray provides mutable array functionality that can contain empty or nil entries.

These classes are implemented using an NSIndexSet internally to keep track of what entries of the array have objects in them and an NDDictionary to keep the objects themselves.

Version 1.5.1

Installation and Usage

Copy the DSSparseArray.h, DSSparseArray.m, DSSparseArrayEnumerator.h, and DSSparseArrayEnumerator.m files into your project then just use like an NSArray or NSMutableArray, substituting DSSparseArray or DSMutableSparseArray. Should be compatible with iOS or Mac OS X.

License

The MIT License (MIT)

Copyright (c) [2014] [David W. Stockton]

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.

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A relatively complete sparse array implementation in objective-c for Mac or iOS.

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