C#講義10操作符重載

1、110 操作符重載操作符重載是c十十的突出特征，Java語(yǔ)言不支持操作符重載。C#支持操作符重載。 2npublic struct Complex public int real;public int imaginary;public Complex(int real, int imaginary) /構(gòu)造函數(shù) this.real = real; this.imaginary = imaginary; public static Complex Add(Complex a,Complex b) /靜態(tài)函數(shù) return new Complex (a.real +b.real ,a.imagin

2、ary +b.imaginary ); public Complex Add(Complex a) /非靜態(tài)函數(shù) return new Complex (real+a.real ,imaginary +a.imaginary );3 Complex a=new Complex (3,4);Complex b=new Complex (5,6);Complex c=Complex.Add (a,b); /靜態(tài)函數(shù) c=a.Add(b); /非靜態(tài)函數(shù)一個(gè)更加直觀的實(shí)現(xiàn)方式是對(duì)“”進(jìn)行運(yùn)算符重載。 4public struct Complex public static Complex opera

3、tor +(Complex c1, Complex c2) return new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary); n以“operator +”代替函數(shù)“Add” Complex a=new Complex (3,4);Complex b=new Complex (5,6);Complex c=a+b; /a+b被翻譯為：Complex.operator+(a,b);5nC+中允許如下的重載方式：public Complex operator + (Complex a) return new Complex (re

4、al+a.real ,imaginary +a.imaginary );C#中不允許。6相等操作符 public static bool operator =(Complex c1, Complex c2) if (c1.real = c2.real & c1.imaginary = c2.imaginary) return true; else return false; 7n要求也要定義匹配的運(yùn)算符“!=” public static bool operator !=(Complex c1, Complex c2) if (c1=c2) return false; else ret

5、urn true; 8n 警告CS0660: “ClassLibrary3.Complex”定義運(yùn)算符= 或運(yùn)算符!=，但不重寫Object.Equals(object o) public override bool Equals(object obj) if (!(obj is Complex) return false; if (object.ReferenceEquals(this, obj) return true; if (this != (Complex)obj) return false; else return true; 9n警告CS0661: “ClassLibrary3.Complex”定義運(yùn)算符= 或運(yùn)算符!=，但不重寫Object.GetHashCode()n設(shè)計(jì)者認(rèn)為如果任何對(duì)象的任何實(shí)例都能被放入到哈希表集合中，其用途將很大。為此，System.Object提供了一個(gè)虛GetHashCode方法，使得哈希代碼可以被所有對(duì)象獲取 n哈希函數(shù)通常是特定于每個(gè) Type 的，而且，必須至少使用一個(gè)實(shí)例字段作為輸入。n如果兩個(gè)類型相同的對(duì)象表示相同的值，則哈希函數(shù)必須為兩個(gè)對(duì)象返回相同的常數(shù)值。nHash值相同，對(duì)象不一定相等。 n為了