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Notes about C++
Abstraction Mechanisms, Part 2
Inheritance: Copying and slicing

'Real object-oriented programming' relies on reference semantics (use of pointers or C++ references to objects) rather than value semantics (copying of objects)

  • The C++ Programming Language: Page 307
 

  • In the example programs: The class B is derived from class A

    • We copy an instance of B to a variable of type A

    • No pointer types or reference types are involved

    • The B part of the object is lost

    • We say that it is sliced

y:/Kurt/Files/Advanced-programming-cpp/cpp/kn/slicing/slice-1.ccIllustration of object slicing.


y:/Kurt/Files/Advanced-programming-cpp/cpp/kn/slicing/slice-1-outputProgram output.


y:/Kurt/Files/Advanced-programming-cpp/cpp/kn/slicing/slice-2.ccDoes this variant change the game?.


y:/Kurt/Files/Advanced-programming-cpp/cpp/kn/slicing/slice-2-outputProgram output.


Go to exerciseSlicing an object during parameter passing.