基于ostringstream输出日志

#include "windows.h"
#include 
#include 
#include 
#include 

#pragma region MyLogger

class Logger
{
private:
    std::ostringstream os;
public:
    Logger() {};
    ~Logger() {
        //输出到指定地方
        os << std::endl;
        std::cout << os.str();
        OutputDebugStringA(os.str().c_str());
    }
    
    std::ostream& getStream() { 
        return os << std::flush;
    }
    
    //类内部：输出任意类型数据1
    template
    Logger& operator <<(const T &t)
    {
        getStream() << t;
        return *this;
    }
    
    //输出类成员
    template
    friend std::ostream& operator<<(std::ostream &os, const Logger& l)
    {
        os << l.getStream().str();
        return os;
    };
};

//类外部：输出任意类型数据2
//template  Logger& operator<<(Logger& l, const T& val)
//{
//    l.getStream() << val;
//    return l;
//}

//智能指针自动析构
inline auto loggerPtr()->std::shared_ptr
{
    return std::make_shared();
}

//实例
#define LogInfo      *loggerPtr()
#define LogStream    loggerPtr()->getStream()

#pragma endregion

//使用
LogInfo << 1 << " Loginfo string " << 3.1415926;

2. 继承

class Logger : public std::ostringstream
{
public:
    Logger() {};
    virtual ~Logger() {
        std::cout << str() << std::endl;
    };

    template
    Logger& operator <<(const T &t)
    {
        (std::ostringstream&)(*this) << t;
        return *this;
    }
};