g2log 介绍
g2log 是一个简单高效的异步日志工具，使用 C++11 实现。
示例代码：
#include "g2log.h"
int main(int argc, char** argv)
{
g2logWorker g2log(argv[0], "/tmp/whatever-directory-path-you-want/");
g2::initializeLogging(&g2log);
LOG(INFO) << "Simple to use with streaming syntax, easy as ABC or " << 123;
LOGF(WARNING, "Printf-style syntax is also %s", "available");
LOGF(FATAL, "This %s is FATAL. After log flush -> Abort()", "message");
// or using the stream API
LOG(FATAL) << "This message is FATAL. After log flush -> Abort()";
}