在delphi / objectpascal中 - “procedure somemethod（）”之间的区别。和“类程序somemethod（）” [英] In delphi/objectpascal - difference between "procedure somemethod()" and "class procedure somemethod()"

问题描述

我很难理解以下（类似）程序定义之间的区别。另外我想知道如何确定何时以及为何使用第二个定义。



＃1 - 标准例行定义

I am having difficulties understanding the difference between the following (similar) procedure definitions. Also I'm wondering how to determine when and why to use the 2nd definition.

#1 - Standard routine definition

type
  TFigure = class
  public
     function Supports(Operation: string): Boolean; virtual;
     procedure GetInfo(var Info: TFigureInfo); virtual;
     ...
  end;

＃2 - 常规以关键字class开头

#2 - routine prefaced by the keyword "class"

type
  TFigure = class
  public
     class function Supports(Operation: string): Boolean; virtual;
     class procedure GetInfo(var Info: TFigureInfo); virtual;
     ...
  end;

我的尝试：



我用Google搜索了这个主题，无法找到何时/为何使用class关键字的简单直接定义。



这两个例子在我的问题中取自Embarcadero网站 - 我刚刚删除了类，例如＃1。我没有看到任何文档：具体的差异或何时/为什么以关键字class开头。



这已经困扰了我很长一段时间了，非常感谢任何澄清。



b 。

What I have tried:

I've googled this topic and cannot find a simple, direct definition of when/why to use the "class" keyword.

The 2 examples in my question were taken from the Embarcadero website - I just removed the "class" for example #1. I did not see any documentation re: the specific differences or when/why to preface with the keyword "class".

This has been bugging me for quite a while now and any clarification is greatly appreciated.

b.

推荐答案

没有class说明符的方法（过程/函数）是普通方法，它们是类的任何INSTANCE的一部分，而那些具有类的方法class说明符是类本身的方法，而不是类的INSTANCE。

The methods (procedures / functions) without the "class" specifier are normal methods that are a part of any INSTANCE of a class, whereas those with the "class" specifier are methods of the class itself, and not of an INSTANCE of the class.

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