模仿glog风格的log实现

需求

实现一个类似glog风格支持<<链式调用的log库。

代码

利用的析构函数的特性，每次LOG结束后会自动调用，完成消息拼接。

#include <string>
#include <iostream>

class LOG
{
public:
    LOG(int lv)
    {
        level = lv;
        body = "";
    }
    template<typename type>
    LOG& operator<<(type msg)
    {
        body += std::to_string(msg);
        return *this;
    }
    LOG& operator<<(const char* msg)
    {
        body += msg;
        return *this;
    }
    ~LOG()
    {
        std::cout << "[" << level << "] " \
            << body << std::endl;
    }
private:
    int level = 0;
    std::string body;
};

int main()
{
    // for simplicity, 1 2 3 for INFO WARN ERROR
    LOG(1) << "test" << 111;
    LOG(2) <<"string: " << float(41*8 + 59%8)/640*1900;
    return 0;
}

效果

[1] test111
[2] string: 982.656189