对cout << 重载的源代码

最新推荐文章于 2024-02-20 11:31:23 发布

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最新推荐文章于 2024-02-20 11:31:23 发布

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本文介绍了一个C++程序示例，展示了如何定义一个包含构造函数、析构函数、拷贝构造函数及赋值运算符重载的简单类。此外，还演示了如何重载类型转换运算符和函数调用运算符，以及如何自定义输出流操作符以实现类实例的输出。

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#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;
}