Objective-C History

Abstract:

1. Objective-C is based on SmallTalk-80, vs Simula, adopted by C++ 

2. Objective-C is a ‘strict superset‘ of C

3. Objective-C model of OOP is based on Message Passing to object.

Detail:

 Objective-C                                        1980 

 Object-Oriented Pre-Compiler              1982

 Commercial  version                           1986  coupled an Objective-C compiler with class libraries

 GCC compiler of Objective-C                1988  extended a GCC compiler of Objective-C

 GNU Objective-C runtime                     1992

 Clang compiler of Objective-C              2009

 Swift                                                  2014  characterized as "Objective-C without the C"

Objective-C History

原文：http://www.cnblogs.com/hushuai-ios/p/5093269.html