Simula-Virtual function

最新推荐文章于 2020-10-08 17:35:26 发布

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最新推荐文章于 2020-10-08 17:35:26 发布

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Simula是一种在1960年代开发的编程语言，被认为是第一种面向对象的语言。它引入了诸如对象、类、继承等概念，并影响了后来的编程语言如C++和Java的发展。

Simula is the name of two simulation programming languages, Simula I and Simula 67, developed in the 1960s at the Norwegian Computing Center in Oslo, by Ole-Johan Dahl and Kristen Nygaard. Syntactically, it is a fairly faithful superset of ALGOL 60.^[1]^:1.3.1

Simula 67 introduced objects,^[1]^{:2, 5.3} classes,^[1]^{:1.3.3, 2} inheritance and subclasses,^[1]^:2.2.1 virtual procedures,^[1]^:2.2.3coroutines,^[1]^:9.2 and discrete event simulation,^[1]^:14.2 and features garbage collection.^[1]^:9.1 Also other forms of subtyping(besides inheriting subclasses) were introduced in Simula derivatives.^{[citation needed]}

Simula is considered the first object-oriented programming language. As its name suggests, Simula was designed for doing simulations, and the needs of that domain provided the framework for many of the features of object-oriented languages today.

The influence of Simula is often understated, and Simula-type objects are reimplemented in C++, Object Pascal, Java, C# and several other languages. Computer scientists such as Bjarne Stroustrup, creator of C++, and James Gosling, creator of Java, have acknowledged Simula as a major influence.^[2]

https://en.wikipedia.org/wiki/Simula

In object-oriented programming, in languages such as C++, and Object Pascal, a virtual function or virtual method is an inheritable and overridable function or method for which dynamic dispatch is facilitated. This concept is an important part of the (runtime) polymorphismportion of object-oriented programming (OOP). In short, a virtual function defines a target function to be executed, but the target might not be known at compile time.