Delphi：方法'创建'隐藏基础的虚拟方法 - 但它在那里 [英] Delphi: Method 'Create' hides virtual method of base - but it's right there

问题描述

考虑假设的对象层次结构，从以下开始：

Consider the hypothetical object hierarchy, starting with:

TFruit = class(TObject)
public
    constructor Create(Color: TColor); virtual;
end;

及其后代：

TApple = class(TFruit)
public
    constructor Create(); overload; virtual;
    constructor Create(Color: TColor); overload; override; //deprecated. Calls other constructor - maintaining the virtual constructor chain
end;

这里的想法是我覆盖 虚拟

The idea here is that i've overridden the virtual constructor of the base class, with an overload that also happens to be virtual.

Delphi抱怨：

方法'创建'隐藏基类型TFruit的虚拟方法

Method 'Create' hides virtual method of base type 'TFruit'

除了它不会隐藏 - 它在那里！

Except it doesn't hide it - it's right there!

• 我 覆盖祖先的虚拟方法，


• 我 重载 与另一个版本

什么是交易？

推荐答案

两种解决方案：

type
  TFruit = class(TObject)
  public
    constructor Create(Color: TColor); virtual;
  end;

  TApple = class(TFruit)
  public
    constructor Create(); reintroduce; overload;
    constructor Create(Color: TColor); overload; override;
  end;

或：

type
  TFruit = class(TObject)
  public
    constructor Create; overload; virtual; abstract;
    constructor Create(Color: TColor); overload; virtual;
  end;

  TApple = class(TFruit)
  public
    constructor Create(); override;
    constructor Create(Color: TColor); override; 
  end;

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