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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi - 新語法介紹之運算符重載

Delphi - 新語法介紹之運算符重載

編輯:Delphi

運算符重載一直是個爭議的話題,.其實運算符重載就是方便我們而已,不用不會死人,用了方便點兒而已.D7之後的版本也支持運算符重載.我們來看個例子:
如果我們想2個結構體可以相加,比如說 a,b:TPoint;C:=a+b;是吧,多美好的事情呀.

01 THuangJacky = record
02     A,B,C:Integer;
03     //+
04     class Operator Add(a, b: THuangJacky): THuangJacky;
05     //=
06     class Operator Equal(a,b: THuangJacky):Boolean;
07 end;
08 var
09     Form1: TForm1;
10 implementation
11 {$R *.dfm}
12 { TH }
13 class Operator THuangJacky.Add(a, b: THuangJacky): THuangJacky;
14 begin
15     Result.A:=a.A + a.A;
16     Result.B:=a.B + b.B;
17     Result.C:=a.C + b.C;
18 end;
19 class Operator THuangJacky.Equal(a, b: THuangJacky): Boolean;
20 begin
21     if (a.A=b.A)and(a.B=b.B)and(a.C=b.C) then
22         Result:=True
23     else
24         Result:=False;
25 end;
26 procedure TForm1.btn1Click(Sender: TObject);
27 var
28     a,b,c:THuangJacky;
29 begin
30     a.A:=5;a.B:=6;a.C:=7;
31     b.A:=2;b.B:=3;b.C:=4;
32     //這就是好處
33     c:=a+b;
34     ShowMessageFmt('%D,%D,%D',[c.A,c.B,c.C]);
35     if not (a=b) then
36         ShowMessage('not equal');
37 end;


我們這裡的結構體就可以直接+ 和 = 判斷了,方便了那些搞算法的人.哈哈.下面附上所有的運算符:

  Implicit   Conversion   Implicit(a : type) : resultType; (封箱)   implicit typecast   Explicit   Conversion   Explicit(a: type) : resultType; (拆箱)   explicit typecast   Negative   Unary   Negative(a: type) : resultType;   -   Positive   Unary   Positive(a: type): resultType;   +   Inc   Unary   Inc(a: type) : resultType;   Inc   Dec   Unary   Dec(a: type): resultType   Dec   LogicalNot   Unary   LogicalNot(a: type): resultType;   not   BitwiseNot   Unary   BitwiseNot(a: type): resultType;   not   Trunc   Unary   Trunc(a: type): resultType;   Trunc   Round   Unary   Round(a: type): resultType;   Round   Equal   Comparison   Equal(a: type; b: type) : Boolean;   =   NotEqual   Comparison   NotEqual(a: type; b: type): Boolean;   <>   GreaterThan   Comparison   GreaterThan(a: type; b: type) Boolean;   >   GreaterThanOrEqual   Comparison   GreaterThanOrEqual(a: type; b: type): resultType;   >=   LessThan   Comparison   LessThan(a: type; b: type): resultType;   <   LessThanOrEqual   Comparison   LessThanOrEqual(a: type; b: type): resultType;   <=   Add   Binary   Add(a: type; b: type): resultType;   +   Subtract   Binary   Subtract(a: type; b: type) : resultType;   -   Multiply   Binary   Multiply(a: type; b: type) : resultType;   *   Divide   Binary   Divide(a: type; b: type) : resultType;   /   IntDivide   Binary   IntDivide(a: type; b: type): resultType;   div   Modulus   Binary   Modulus(a: type; b: type): resultType;   mod   LeftShift   Binary   LeftShift(a: type; b: type): resultType;   shl   RightShift   Binary   RightShift(a: type; b: type): resultType;   shr   LogicalAnd   Binary   LogicalAnd(a: type; b: type): resultType;   and   LogicalOr   Binary   LogicalOr(a: type; b: type): resultType;   or   LogicalXor   Binary   LogicalXor(a: type; b: type): resultType;   xor   BitwiseAnd   Binary   BitwiseAnd(a: type; b: type): resultType;   and   BitwiSEOr   Binary   BitwiSEOr(a: type; b: type): resultType;   or   BitwiseXor   Binary   BitwiseXor(a: type; b: type): resultType;   xor

 

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