6--总结示例

#include <iostream>

using namespace std;

class Point
{
public:
  Point():m_x(0),m_y(0),m_z(0){cout<<"构造函数1执行！"<<endl;}
  Point(int x,int y):m_x(x),m_y(y),m_z(0){cout<<"构造函数2执行！"<<endl;}
  Point(int x,int y,int z):m_x(x),m_y(y),m_z(z){cout<<"构造函数3执行！"<<endl;}

  Point(const Point &p):m_x(p.m_x),m_y(p.m_y),m_z(p.m_z)
  {
    cout<<"拷贝构造函数执行！"<<endl;
  }
  ~Point(){cout<<"析构函数执行！"<<*this<<endl;}

  friend ostream & operator<<(ostream &out,const Point &p);

private:
  int m_x;
  int m_y;
  int m_z;
};

ostream & operator<<(ostream &out,const Point &p)
{
  out<<p.m_x<<" "<<p.m_y<<" "<<p.m_z<<endl;
  return out;
}

Point fun(Point p)
{
  return p;
}

int main()
{
  Point p1;
  Point p2(10,10);
  Point p3(10,10,10);

  Point p4(p3);
  fun(p3);

    return 0;
}

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