Linux Ubuntu cpp 日志模板 带系统时间

代码：log_demo.cpp

#include <string.h>
#include <fstream>
#include <boost/thread.hpp>
#include <time.h>
#include <unistd.h>

using namespace std;
class Demo
{
  public:
    Demo();
    ~Demo();
    
    ofstream DEMO_LOG; 
    
    void func();    
    string getTime();
};
Demo::Demo()
{
  string file="/home/xx/demo.log";//xx=your user name
  DEMO_LOG.open(file.c_str());
  
}
Demo::~Demo()
{

}

void Demo::func()
{
  while(1)
  {
    string time=getTime();
    DEMO_LOG<<time<<endl;//把DEMO_LOG当成cout使用就好了，哪里想写写哪里
    cout<<time<<endl;
    sleep(1);
  }  
}
string Demo::getTime()
{
    time_t timep;
    time (&timep);
    char tmp[64];
    strftime(tmp, sizeof(tmp), "%Y-%m-%d %H:%M:%S",localtime(&timep) );
    return tmp;
}
int main()
{
  Demo demo;
  boost::thread td(boost::bind(&Demo::func,&demo));
  td.join();
  return 0;
}

编译：

g++ log_demo.cpp -o demo -lboost_system -lboost_thread

运行：

xx@xxThinkPad-X:~$ cat demo.log 
2021-03-18 15:10:54
2021-03-18 15:10:55
2021-03-18 15:10:56
2021-03-18 15:10:57
2021-03-18 15:10:58
2021-03-18 15:10:59
2021-03-18 15:11:00