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defer.go
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defer.go
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package main
import (
"fmt"
)
func f1() (result int) {
defer func() { //return语句不是一条原子调用,return xxx其实是: 赋值+RET指令
result++ //defer语句被插入到 赋返回值 和 RET指令之间
fmt.Println("inner:",&result)
}()
fmt.Println("outer:",&result)
return 1
}
func f11() (result int) {
result = 0
fmt.Println(&result)
func() {
result++
fmt.Println(&result)
fmt.Println(result)
}()
return
}
func f2() (r int) {
t := 5
defer func() { //CALL runtime.deferproc
t = t + 5
fmt.Println(t)
}()
return t //CALL runtime.deferreturn
}
func f22() (r int) {
t := 5
r = t
func() { //CALL runtime.deferproc
t = t + 5
fmt.Println(t)
}()
return //CALL runtime.deferreturn
}
func f3() (r int) {
defer func(r int) {
r = r + 5
fmt.Println(r)
}(r)
return 1
}
func f33() (r int) {
r = 1
fmt.Println(&r)
fmt.Println("================")
func(r int) { //注意这里是参数传递进来的,所以匿名函数中的变量r和外部函数中的r是不同的变量
fmt.Println(&r)
r = r + 5
fmt.Println(r)
}(r)
return
}
func main() {
w := f1()
fmt.Println(w)
}