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  2. Class (computer programming) - Wikipedia

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

    An abstract class may provide implementations of some methods, and may also specify virtual methods via signatures that are to be implemented by direct or indirect descendants of the abstract class. Before a class derived from an abstract class can be instantiated, all abstract methods of its parent classes must be implemented by some class in ...

  3. Abstraction (computer science) - Wikipedia

    en.wikipedia.org/wiki/Abstraction_(computer_science)

    Computer science commonly presents levels (or, less commonly, layers) of abstraction, wherein each level represents a different model of the same information and processes, but with varying amounts of detail. Each level uses a system of expression involving a unique set of objects and compositions that apply only to a particular domain.

  4. List of abstractions (computer science) - Wikipedia

    en.wikipedia.org/wiki/List_of_abstractions...

    Ensures that a class has only one instance and provides a global point of access to it. Factory method pattern: Defines an interface for creating an object, but defers instantiation to subclasses. Abstract Factory pattern: Provides an interface for creating families of related or dependent objects without specifying their concrete classes ...

  5. Abstract machine - Wikipedia

    en.wikipedia.org/wiki/Abstract_machine

    Abstract machines are typically categorized into two types based on the quantity of operations they can execute simultaneously at any given moment: deterministic abstract machines and non-deterministic abstract machines. [2] A deterministic abstract machine is a system in which a particular beginning state or condition always yields the same ...

  6. Abstract type - Wikipedia

    en.wikipedia.org/wiki/Abstract_type

    In class-based object-oriented programming, abstract types are implemented as abstract classes (also known as abstract base classes), and concrete types as concrete classes. In generic programming , the analogous notion is a concept , which similarly specifies syntax and semantics, but does not require a subtype relationship: two unrelated ...

  7. Abstraction principle (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Abstraction_principle...

    In software engineering and programming language theory, the abstraction principle (or the principle of abstraction) is a basic dictum that aims to reduce duplication of information in a program (usually with emphasis on code duplication) whenever practical by making use of abstractions provided by the programming language or software libraries. [1]

  8. Hardware abstraction - Wikipedia

    en.wikipedia.org/wiki/Hardware_abstraction

    A hardware abstraction layer (HAL) is an abstraction layer, implemented in software, between the physical hardware of a computer and the software that runs on that computer. . Its function is to hide differences in hardware from most of the operating system kernel, so that most of the kernel-mode code does not need to be changed to run on systems with different hardwa

  9. Abstraction layer - Wikipedia

    en.wikipedia.org/wiki/Abstraction_layer

    In computing, an abstraction layer or abstraction level is a way of hiding the working details of a subsystem. Examples of software models that use layers of abstraction include the OSI model for network protocols, OpenGL, and other graphics libraries, which allow the separation of concerns to facilitate interoperability and platform independence.

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