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Cocoa® Programming for Mac® OS X, Fourth Edition by Aaron Hillegass, Adam Preble

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Chapter 3. Objective-C

Once upon a time, a man named Brad Cox decided that it was time for the world to move toward a more modular programming style. C was a popular and powerful language. Smalltalk was an elegant untyped object-oriented language. Starting with C, Brad Cox added Smalltalk-like classes and message-sending mechanisms. He called the result Objective-C. Objective-C is a very simple extension of the C language. In fact, it was originally just a C preprocessor and a library.

Objective-C is not a proprietary language. Rather, it is an open standard that has been included in the Free Software Foundation’s GNU C compiler (gcc) for many years. More recently, Apple has become heavily involved in the clang/LLVM (Low Level Virtual Machine) ...

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