example16.cpp

来自「Advanced Internet Programming Lecture 2 」· C++ 代码 · 共 36 行

#include <iostream>
using namespace std;

class cl {
  int id;
public:
  int i;
  cl(int i);
  ~cl();
  void neg(cl &o) { o.i = -o.i; } // no temporary created
};

cl::cl(int num)
{
  cout << "Constructing " << num << "\n";
  id = num;
}

cl::~cl()
{
  cout << "Destructing " << id << "\n";
}

int main()
{
  cl o(1);

  o.i = 10;
  o.neg(o);

  cout << o.i << "\n";

  return 0;
}