Go中的静态局部变量

Is it possible to define a local variable in Go that can maintain its value from one function call to another? In C, we can do this using the reserved word static.

Example in C:

int func() {
    static int x = 0; 
    x++;
    return x;
}

Use a closure:

Function literals are closures: they may refer to variables defined in a surrounding function. Those variables are then shared between the surrounding function and the function literal, and they survive as long as they are accessible.

It doesn't have to be in global scope, just outside the function definition.

func main() {

    x := 1

    y := func() {
        fmt.Println("x:", x)
        x++
    }

    for i := 0; i < 10; i++ {
        y()
    }
}

(Sample on the Go Playground)

Declare a var at global scope:

var i = 1

func a() {
  println(i)
  i++
}

You can do something like this

package main

import (
    "fmt"
)

func main() {
  f := do()
  f() // 1
  f() // 2
}

func do() (f func()){
  var i int
  f = func(){
    i++
    fmt.Println(i)
  }
  return
}

Link on Playground https://play.golang.org/p/D9mv9_qKmN

Like Taric' suggestion, but with staticCounter() returning an int function

package main

import (
    "fmt"
)

func staticCounter() (f func()(int)){
  var i int
  f = func()(int){
    i++
//  fmt.Println(i)
    return i
  }
  return
}

func main() {
  f := staticCounter()
  g := staticCounter()
  fmt.Println(f())
  fmt.Println(f())
  fmt.Println(f())
  fmt.Println(f())
  fmt.Println(g())
  fmt.Println(g())
}