DELPHI8操作符重载的例子

unit WinForm;

interface

uses
System.Drawing, System.Collections, System.ComponentModel,
System.Windows.Forms, System.Data;

type
TWinForm = class(System.Windows.Forms.Form)
{$REGION ''''Designer Managed Code''''}
strict private
/// <summary>
/// Required designer variable.
/// </summary>
Components: System.ComponentModel.Container;
Button1: System.Windows.Forms.Button;
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
procedure InitializeComponent;
procedure Button1_Click(sender: System.Object; e: System.EventArgs);
{$ENDREGION}
strict protected
/// <summary>
/// Clean up any resources being used.
/// </summary>
procedure Dispose(Disposing: Boolean); override;
private
{ Private Declarations }
public
constructor Create;
end;

//写成类也可以,这里我用了记录。由于记录是值类型省去了创建实例的麻烦
TClassTest=record
public
FA:Integer;
//重载了“ ”操作符
class operator add(A,B:TClassTest):TClassTest;
end;

[assembly: RuntimeRequiredAttribute(TypeOf(TWinForm))]

implementation

{$REGION ''''Windows Form Designer generated code''''}
/// <summary>
/// Required method for Designer support -- do not modify
/// the contents of this method with the code editor.
/// </summary>
procedure TWinForm.InitializeComponent;
begin
Self.Button1 := System.Windows.Forms.Button.Create;
Self.SuspendLayout;
//
// Button1
//
Self.Button1.Location := System.Drawing.Point.Create(96, 88);
Self.Button1.Name := ''''Button1'''';
Self.Button1.Size := System.Drawing.Size.Create(392, 112);
Self.Button1.TabIndex := 0;
Self.Button1.Text := ''''Button1'''';
Include(Self.Button1.Click, Self.Button1_Click);
//
// TWinForm
//
Self.AutoScaleBaseSize := System.Drawing.Size.Create(6, 14);
Self.ClientSize := System.Drawing.Size.Create(560, 357);
Self.Controls.Add(Self.Button1);
Self.Name := ''''TWinForm'''';
Self.Text := ''''WinForm'''';
Self.ResumeLayout(False);
end;
{$ENDREGION}

procedure TWinForm.Dispose(Disposing: Boolean);
begin
if Disposing then
begin
if Components <> nil then
Components.Dispose();
end;
inherited Dispose(Disposing);
end;

constructor TWinForm.Create;
begin
inherited Create;
//
// Required for Windows Form Designer support
//
InitializeComponent;
//
// TODO: Add any constructor code after InitializeComponent call
//
end;

procedure TWinForm.Button1_Click(sender: System.Object; e: System.EventArgs);
var
A,B,C:TClassTest;
begin
A.FA :=1;
B.FA :=2;
C:=A B; //两个结构（或者类）用 操作，在DELHI8以前是不可想象的
system.Windows.Forms.MessageBox.Show(System.Convert.ToString(C.FA) );
end;

{ TClassTest }

//重载“ ”操作符的实现
class operator TClassTest.add(A, B: TClassTest): TClassTest;
begin
Result.FA:=A.FA B.FA;
end;

end.

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