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Simula(67) definitely was the original concept/implementation of OO. Smalltalk, C++, Java, etc all derived different aspects of it. - Main abstraction are clas
by smt1 6y ago
Simula(67) definitely was the original concept/implementation of OO. Smalltalk, C++, Java, etc all derived different aspects of it.
- Main abstraction are classes (of objects).
- Concept of self-initializing data/procedure objects
Internal ("concrete") view of an object vs an external ("abstract")
- Differentiated between object instances and the class
- Class/subclass facility made it possible to define generalized object classes, which could be specialized by defining subclasses containing additional declared properties
- Different subclasses could contain different virtual procedure declarations
- Domain specific language dialects
- frankpf 6y agoHey smt1, looks like your account is dead and has been for a while.
- weatherlight 6y agoit's clearly not dead.
- klibertp 6y agoActually, it might be. The comment was dead, I vouched for it, so it appeared.
- astrange 6y agoNote Java is actually explicitly based on Objective-C, not on Simula or C++. They just removed most of the Smalltalk bits to make it faster and less scary-looking to C++ programmers.