c++ 逗号操作符重载-蒲公英云

c++ 逗号操作符重载

Overload Operator Comma

首先看看think in c++ 给出的一个重载的例子

#include <iostream>
using namespace std;
class After {
public:
  const After& operator,(const After&) const {
    cout << "After::operator,()" << endl;
    return *this;
  }
};
class Before {};
Before& operator,(int, Before& b) {
  cout << "Before::operator,()" << endl;
  return b;
}
int main() {
  After a, b;
  a, b;  // Operator comma called
  Before c;
  1, c;  // Operator comma called
} ///:~

下面是实际使用中用到的例子

#include <iostream>
#include <typeinfo>
using namespace std;
class CClient
{
public:
    CClient(){};
    ~CClient(){};
public:
    CClient&  operator,(string str)
    {
        strIpAddr_=str;
        return  *this;
    }
    CClient& operator,(int nVal)
    {
        nPort_=nVal;
        return  *this;
    };
    bool connect()
    {
        //Connect(strIpAddr_,nPort_);
        cout<<"connect to server "<<endl;
        return true;
    }
public:
    string strIpAddr_;
    int    nPort_;
};
struct  OutputDebugInfo
{
    OutputDebugInfo& operator,(string str)
    {
        cout<<str;
    }
};
#define  outputDebugInfo OutputDebugInfo{},
int main() {
    (CClient {},80,"192.168.1.10").connect();
    outputDebugInfo "Log: this is Debug Infomation Test \n";
    return 0;
}