如果不符合要求，将执行glog内容

Question

The question is simple, I have a log like this:

glog.v(5).Infof("xxx %v", getLogContent())

But my getLogContent() is a time consuming method, so I want to ask: will getLogContent() been executed or not when my program does not meet v(5) level?

Answer 1

Yes.

You should add an if statement if you don't want getLogContent() to run

if glog.V(5) {
    glog.V(5).Infof("xxx %v", getLogContent())
}

Go evaluates all arguments, so getLogContent will get called but the output will not be logged if the verbosity level has not been met.