（zz）对cout << 重载的源代码

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
using namespace std;

 

class CA
{
public:
 CA(int i) : m_i(i)
 {
  cout << "CA@" << this << " Constructor(" << i << ")" << endl;
 }
 
 CA(const CA& a) : m_i(a.m_i)
 {
  cout << "CA@" << this << " CopyConstructor(" << &a << ")" << endl;
 }
 
 CA& operator = (const CA& a)
 {
  m_i = a.m_i;
  cout << "CA@" << this << " Operator=(" << &a << ")" << endl;
 }
 
 ~CA()
 {
  cout << "CA@" << this << " Destructor()" << endl;
 }

 

 int GetValue() const
 {
  return m_i;
 }
 
 bool operator()()
 {
  return (m_i == 0) ? false : true;
 }
 
 string operator() (const CA& a)
 {
  return (m_i == 0) ? "false" : "true";
 }
 
 operator string ()
 {
  return (m_i == 0) ? "convert to false" : "convert to true";
 }
       
protected:
 CA()
 {
  cout << "CA@" << this << " Constructor()" << endl;
 }

 

protected:
 int m_i;
};

 

ostream& operator << (ostream &o, const CA& a)
{
 return (o << "CA@" << &a << " Val=" << a.GetValue());
}

 

ostream& MyManipulator(ostream& o)
{
 return (o << "|myend|");
}

 

class CMyManipulator
{
public:
 CMyManipulator():m_i(0)
 {

 

 }

 

 CMyManipulator(int i):m_i(i)
 {

 

 }

 

 ~CMyManipulator()
 {

 

 }

 

 int GetValue() const
 {
  return m_i;
 }

 

protected:
 int m_i;
};

 

ostream& operator <<(ostream &o, const CMyManipulator& m)
{
 for (int i=0; i<m.GetValue(); ++i)
 {
  o << "|myend" << i << "|";
 }
 
 return o;
}

 

int main()
{
 CA a(0);
 cout << a << endl;
 cout << a() << endl;
 cout << a(a) << endl;
 cout << string(a) << endl;

 

 cout << "some string" << MyManipulator << endl;
 cout << "some string" << CMyManipulator(3) << endl;
 
 return 0;
}