可以重载赋值运算符(=),就像在其它运算符中,它可以被用来创建一个对象就像拷贝构造函数。
以下举例说明赋值操作符如何可以被重载。
#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; }
让我们编译和运行上面的程序,这将产生以下结果:
First Distance : F: 11 I:10 Second Distance :F: 5 I:11 First Distance :F: 5 I:11