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  2. Declaration (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Declaration_(computer...

    The enclosing class can be instantiated, rather a new derived class, which provides the definition of the method, would need to be created in order to create an instance of the class. Starting with Java 8 , the lambda expression was included in the language, which could be viewed as a function declaration.

  3. 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]

  4. Initialization (programming) - Wikipedia

    en.wikipedia.org/wiki/Initialization_(programming)

    In C++, a constructor of a class/struct can have an initializer list within the definition but prior to the constructor body. It is important to note that when you use an initialization list, the values are not assigned to the variable. They are initialized. In the below example, 0 is initialized into re and im. Example:

  5. C++ classes - Wikipedia

    en.wikipedia.org/wiki/C++_classes

    A class in C++ is a user-defined type or data structure declared with any of the keywords class, struct or union (the first two are collectively referred to as non-union classes) that has data and functions (also called member variables and member functions) as its members whose access is governed by the three access specifiers private, protected or public.

  6. One Definition Rule - Wikipedia

    en.wikipedia.org/wiki/One_Definition_Rule

    The One Definition Rule (ODR) is an important rule of the C++ programming language that prescribes that classes/structs and non-inline functions cannot have more than one definition in the entire program and templates and types cannot have more than one definition by translation unit.

  7. Comparison of programming languages (object-oriented ...

    en.wikipedia.org/wiki/Comparison_of_programming...

    class name definition «inheriting from parentclass». «interfaces: interfaces.» method_and_field_declarations endclass. class name implementation. method_implementations endclass. interface name . members endinterface.

  8. Forward declaration - Wikipedia

    en.wikipedia.org/wiki/Forward_declaration

    This is especially useful inside class definitions, e.g. if a class contains a member that is a pointer (or a reference) to another class. Forward-declaration is used to avoid unnecessary coupling which help reducing compilation time by reducing the number of header inclusion. This has a triple advantage:

  9. Template (C++) - Wikipedia

    en.wikipedia.org/wiki/Template_(C++)

    Templates are a feature of the C++ programming language that allows functions and classes to operate with generic types.This allows a function or class declaration to reference via a generic variable another different class (built-in or newly declared data type) without creating full declaration for each of these different classes.