opover.cpp

来自「Thinking in C++ 2nd edition source code 」· C++ 代码 · 共 35 行

//: C12:Opover.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Operator overloading syntax
#include <iostream>
using namespace std;

class Integer {
  int i;
public:
  Integer(int I) { i = I; }
  const Integer
  operator+(const Integer& rv) const {
    cout << "operator+" << endl;
    return Integer(i + rv.i);
  }
  Integer&
  operator+=(const Integer& rv){
    cout << "operator+=" << endl;
    i += rv.i;
    return *this;
  }
};

int main() {
  cout << "built-in types:" << endl;
  int i = 1, j = 2, k = 3;
  k += i + j;
  cout << "user-defined types:" << endl;
  Integer I(1), J(2), K(3);
  K += I + J;
} ///:~