resultcode.h

#ifndef __RESULT_CODE__
#define __RESULT_CODE__

#include <string>
#include <iostream>
using std::string;
using std::ostream;

namespace Result
{
    typedef struct T_Result
    {
        int code;
        string msg;
        friend ostream& operator<<(ostream& os, const T_Result& res)
        {
            os << res.code << '(' << res.msg << ')';
            return os;
        }
    } T_Result;

    static const T_Result OK             = {0, "ok"};
    static const T_Result INVALID_PARAMS = {-1, "invalid params"};
};

#endif //__RESULT_CODE__

// usage demo:
// std::cout << Result::OK << std::endl;
// std::cout << Result::INVALID_PARAMS << std::endl;