班级助手有什么好的用途? [英] What are good uses for class helpers?
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问题描述
Delphi(可能还有很多其他语言)有类助手.这些提供了一种向现有类添加额外方法的方法.无需创建子类.
Delphi (and probably a lot of other languages) has class helpers. These provide a way to add extra methods to an existing class. Without making a subclass.
那么,类助手有什么好的用途?
So, what are good uses for class helpers?
推荐答案
我正在使用它们:
- To insert enumerators into VCL classes that don't implement them.
- To enhance VCL classes.
To add methods to the TStrings class so I can use the same methods in my derived lists and in TStringList.
TGpStringListHelper = class helper for TStringList
public
function Last: string;
function Contains(const s: string): boolean;
function FetchObject(const s: string): TObject;
procedure Sort;
procedure Remove(const s: string);
end; { TGpStringListHelper }
为了简化对记录字段和 删除强制转换.
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