C++ 赋值运算符重载

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  赋值运算符重载

  您可以像其他运算符一样重载赋值运算符（=），它可以像复制构造函数一样用于创建对象。以下示例说明了如何重载赋值运算符。

  
  #include <iostream>
  using namespace std;
   
  class Distance {
     private:
        int feet;             // 0 to infinite
        int inches;           // 0 to 12
        
     public:
        // required constructors
        Distance() {
           feet = 0;
           inches = 0;
        }
        Distance(int f, int i) {
           feet = f;
           inches = i;
        }
        void operator = (const Distance &D ) { 
           feet = D.feet;
           inches = D.inches;
        }
        
        // method to display distance
        void displayDistance() {
           cout << "F: " << feet <<  " I:" <<  inches << endl;
        }
  };
  
  int main() {
     Distance D1(11, 10), D2(5, 11);
  
     cout << "First Distance : "; 
     D1.displayDistance();
     cout << "Second Distance :"; 
     D2.displayDistance();
  
     // use assignment operator
     D1 = D2;
     cout << "First Distance :"; 
     D1.displayDistance();
  
     return 0;
  }
  

  尝试一下

  编译并执行上述代码后，将产生以下结果-

  
  First Distance : F: 11 I:10
  Second Distance :F: 5 I:11
  First Distance :F: 5 I:11