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https://github.com/jspahrsummers/libextobjc

A Cocoa library to extend the Objective-C programming language.
https://github.com/jspahrsummers/libextobjc

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A Cocoa library to extend the Objective-C programming language.

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README 

        
The Extended Objective-C library extends the dynamism of the Objective-C programming language to support additional patterns present in other programming languages (including those that are not necessarily object-oriented).



libextobjc is meant to be very modular – most of its classes and modules can be used with no more than one or two dependencies.



# Features



libextobjc currently includes the following features:



 * **Safe categories**, using EXTSafeCategory, for adding methods to a class without overwriting anything already there (identifying conflicts for you).

 * **Concrete protocols**, using EXTConcreteProtocol, for providing default implementations of the methods in a protocol.

 * **Simpler and safer key paths**, using EXTKeyPathCoding, which automatically checks key paths at compile-time.

 * **Compile-time checking of selectors** to ensure that an object declares a given selector, using EXTSelectorChecking.

 * **Easier use of weak variables in blocks**, using `@weakify`, `@unsafeify`, and `@strongify` from the EXTScope module.

 * **Scope-based resource cleanup**, using `@onExit` in the EXTScope module, for automatically cleaning up manually-allocated memory, file handles, locks, etc., at the end of a scope.

 * **Algebraic data types** generated completely at compile-time, defined using EXTADT.

 * **Synthesized properties for categories**, using EXTSynthesize.

 * **Block-based coroutines**, using EXTCoroutine.

 * **EXTNil, which is like `NSNull`, but behaves much more closely to actual `nil`** (i.e., doesn't crash when sent unrecognized messages).

 * **Lots of extensions** and additional functionality built on top of ``, including extremely customizable method injection, reflection upon object properties, and various functions to extend class hierarchy checks and method lookups.



The [experimental](https://github.com/jspahrsummers/libextobjc/tree/experimental)

branch contains additional features that may be interesting, but are not

considered stable or safe for production use. Check out the headers for more

information.



# Running tests



To execute libextobjc's tests, first run `git submodule update --init --recursive`

to bring in the [xcconfigs](https://github.com/jspahrsummers/xcconfigs) submodule,

then open the project file and choose the desired test target.



# Adding to your project



If you want to add libextobjc as a dependency to an **application**, add the

repository as a [submodule](http://git-scm.com/book/en/Git-Tools-Submodules),

then include the source files you care about in your Xcode project.



If you want to add libextobjc as a dependency to a **framework or library**,

prefer [subtree merging](http://git-scm.com/book/en/Git-Tools-Subtree-Merging),

which will allow you to rename symbols to avoid conflicts, and make any tweaks

you need to for your library.



To create a libextobjc subtree:



```

$ git remote add libextobjc https://github.com/jspahrsummers/libextobjc.git

$ git fetch libextobjc

$ git read-tree --prefix=External/ -u libextobjc/master

$ git reset

```



Rename any symbols or change whatever you want, `git add` the specific files

that you want in your library, and then add them to your Xcode project.



To bring in upstream changes later:



```

$ git fetch -p libextobjc

$ git merge -Xsubtree=External/ libextobjc/master

$ git reset

```



Then, again, just add the changes you want.



# License



Released under the MIT License. See the

[LICENSE](https://github.com/jspahrsummers/libextobjc/blob/master/LICENSE.md)

file for more information.



# Requirements



libextobjc must be built with ARC enabled, and many of its macros require ARC in the calling files as well. MRR usage is not supported.