Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
800 views
in Technique[技术] by (71.8m points)

go - Defer usage clarification

Let's assume I have the following function

func printNumbers(){
 var x int

 defer fmt.Println(x)

 for i := 0; i < 5; i++{
  x++
 }
}

As it is said in the specification:

Each time a "defer" statement executes, the function value and parameters to the call are evaluated as usual and saved anew but the actual function is not invoked.

Obviously, zero will be printed out when the function execution ends. But what should I do if I want to print out the final value of variable x?

I've come up with the following solution:

func printNumbers(){
  var x int

  printVal := func(){
    fmt.Println(x)
  }

  defer printVal()

  for i := 0; i < 5; i++{
    x++
  }
}

So I wonder if there is a better way to resolve this problem.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)
Waitting for answers

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

2.1m questions

2.1m answers

60 comments

56.7k users

...