[英]Closures in Go - declaring functions that take functions as parameters
我一直在試圖找出為什么這不起作用,但不確定。 沙箱中的錯誤是
main.go:16: syntax error: unexpected {, expecting )
碼:
package main
import "fmt"
type handler func(a func(b int))
func HandleSomething(h handler) {
//...
//d := h(5)
//h(5)
// ...
}
func main() {
var foo int
HandleSomething(handler(func(func(b int){
fmt.Printf("debug: foo in main is %d and %d", foo, b)
})))
}
要了解為什么它無法編譯,將最里面的函數放入參數中可能會有所幫助,如https://play.golang.org/p/QPBturZ6GG所示
我認為您正在尋找類似以下內容的內容,但不會做太多https://play.golang.org/p/2tEEwoZRC6
package main
import "fmt"
type handler func(a func(b int))
func HandleSomething(h handler) {
//...
//d := h(5)
//h(5)
// ...
}
func main() {
var foo int
HandleSomething(handler(func(a func(b int)) {
//This doesn't make sense as you don't have access to b
//fmt.Printf("debug: foo in main is %d and %d", foo, b)
fmt.Printf("debug: foo in main is %d", foo)
//You can call your function argument like
a(6)
a(7)
}))
}
以下示例可能會給您帶來更多樂趣
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