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In computer science, an instance is an occurrence of a software element that is based on a type definition. When created, an occurrence is said to have been instantiated, and both the creation process and the result of creation are called instantiation.
Examples
Class instance
A class instance is an object-oriented programming (OOP) object created from a class. Each instance of a class shares a data layout but has its own memory allocation.
Computer instance
A computer instance is an occurrence of a virtual machine which typically includes storage, a virtual CPU.
Polygonal model
A computer graphics polygonal model can be instantiated in order to be drawn several times in different locations in a scene which can improve the performance of rendering since a portion of the work needed to display each instance is reused.
Program instance
In a POSIX-oriented operating system, program instance refers to an executing process. It is instantiated for a program via system calls such as fork() and exec(). Each executing process is an instance of a program which it has been instantiated from.
References
- Bach, Maurice J. (1986). The Design of the UNIX Operating System. Prentice Hall. pp. 10, 24. ISBN 0-13-201799-7. Archived from the original on 2010-03-15.
This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these messages This article contains instructions advice or how to content Please help rewrite the content so that it is more encyclopedic or move it to Wikiversity Wikibooks or Wikivoyage September 2022 This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Instance computer science news newspapers books scholar JSTOR June 2013 Learn how and when to remove this message Learn how and when to remove this message In computer science an instance is an occurrence of a software element that is based on a type definition When created an occurrence is said to have been instantiated and both the creation process and the result of creation are called instantiation ExamplesClass instance A class instance is an object oriented programming OOP object created from a class Each instance of a class shares a data layout but has its own memory allocation Computer instance A computer instance is an occurrence of a virtual machine which typically includes storage a virtual CPU Polygonal model A computer graphics polygonal model can be instantiated in order to be drawn several times in different locations in a scene which can improve the performance of rendering since a portion of the work needed to display each instance is reused Program instance In a POSIX oriented operating system program instance refers to an executing process It is instantiated for a program via system calls such as fork and exec Each executing process is an instance of a program which it has been instantiated from ReferencesBach Maurice J 1986 The Design of the UNIX Operating System Prentice Hall pp 10 24 ISBN 0 13 201799 7 Archived from the original on 2010 03 15
