Question

我想重载一个类中的过程。为此，我写道：

type 

  TMyClass = class(TObject)
  private...
  ...
  public 
   constructor create;
   destructor destroy;
   procedure dosomething(filename: string); overload;
   procedure dosomething(s: string; t: string; u: string); overload;


implementation

  procedure dosomething(filename:string);
  begin
  end;

  procedure dosomething(s: string; t: string; u: string);
  begin
  end;

但delphi告诉我有关前向或外部声明错误的错误......

为什么会这样？

提前感谢！

Answer 1

你必须添加班级名称......

implementation   

procedure TMyClass.dosomething(filename:string);    
begin    
end;

procedure TMyClass.dosomething(s: string; t: string; u: string);    
begin    

end;

Answer 2

它可能告诉您缺少构造函数和析构函数的实现。该程序编译：

program Project1;

{$APPTYPE CONSOLE}

type TMyClass = class(TObject)
  public
    procedure doSomething(const Filename: string); overload;
    procedure doSomething(const s, t, u: string); overload;
end;

{$R *.res}

{ TMyClass }

procedure TMyClass.doSomething(const Filename: string);
begin

end;

procedure TMyClass.doSomething(const s, t, u: string);
begin

end;

begin
  writeln('blubb');
end.

德尔福重载程序

2 个答案: