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2. Virtual function - Wikipedia

   en.wikipedia.org/wiki/Virtual_function

   [7]: §13.4.6 [8] This is true even if the class contains an implementation for that pure virtual function, since a call to a pure virtual function must be explicitly qualified. [10] A conforming C++ implementation is not required (and generally not able) to detect indirect calls to pure virtual functions at compile time or link time.

3. Curiously recurring template pattern - Wikipedia

   en.wikipedia.org/wiki/Curiously_recurring...

   This effectively emulates the virtual function call system at compile time without the costs in size or function call overhead (VTBL structures, and method lookups, multiple-inheritance VTBL machinery) at the disadvantage of not being able to make this choice at runtime.

4. Pure function - Wikipedia

   en.wikipedia.org/wiki/Pure_function

   I/O is inherently impure: input operations undermine referential transparency, and output operations create side effects.Nevertheless, there is a sense in which a function can perform input or output and still be pure, if the sequence of operations on the relevant I/O devices is modeled explicitly as both an argument and a result, and I/O operations are taken to fail when the input sequence ...

5. Virtual method table - Wikipedia

   en.wikipedia.org/wiki/Virtual_method_table

   The call to d->f1() passes a B1 pointer as a parameter. The call to d->f2() passes a B2 pointer as a parameter. This second call requires a fixup to produce the correct pointer. The location of B2::f2 is not in the virtual method table for D. By comparison, a call to d->fnonvirtual() is much simpler: (*

6. Virtual inheritance - Wikipedia

   en.wikipedia.org/wiki/Virtual_inheritance

   Virtual inheritance is a C++ technique that ensures only one copy of a base class ' s member variables are inherited by grandchild derived classes. Without virtual inheritance, if two classes B and C inherit from a class A, and a class D inherits from both B and C, then D will contain two copies of A ' s member variables: one via B, and one via C.

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9. Class (computer programming) - Wikipedia

   en.wikipedia.org/wiki/Class_(computer_programming)

   [26] [27] In C++, an abstract class is a class having at least one abstract method given by the appropriate syntax in that language (a pure virtual function in C++ parlance). [25] A class consisting of only pure virtual methods is called a pure abstract base class (or pure ABC) in C++ and is also known as an interface by users of the language. [13]