Delphi:泛型子体的泛型列表,并将泛型作为参数

我在理解泛型以及它们如何可以和不可以被使用方面有些困难。

我有一个通用类TControlMediator,如下所示:

TControlMediator<C, T> = class
private
  FMediatedComponent: C;
public
  constructor Create(ComponentToMediate: C);

  function GetValue: T; virtual; abstract;
  procedure SetValue(Value: T); virtual; abstract;

  property MediatedControl: C read FMediatedComponent;
end;

TEditMediator = class(TControlMediator<TEdit, string>)
public
  function GetValue: string; override;
  procedure SetValue(Value: string); override;
end;

到目前为止,一切似乎都正常。但是,当我需要TControlMediator子体列表或将TControlMediator作为方法的参数时,会出现问题:

TViewMediator = class
private
  FControlMediators: TList<TControlMEdiator<C, T>>;
public
  procedure registerMediator(AControlMediator: TControlMediator<C, T>);
  procedure unregisterMediator(AControlMediator: TControlMediator<C, T>);
end;

编译器因出现致命错误而停止:

[DCC Error] mediator.pas(23): E2003 Undeclared identifier: 'C'
[DCC Error] mediator.pas(28): E2007 Constant or type identifier expected