英文:
Closures in Go - declaring functions that take functions as parameters
问题
我一直在尝试弄清楚为什么这段代码不起作用，但不确定。沙盒中的错误是：
main.go:16: 语法错误：意外的 {，期望 )
代码：
package mainimport "fmt"type handler func(a func(b int))func HandleSomething(h handler) {//...//d := h(5)//h(5)// ...}func main() {var foo intHandleSomething(handler(func(func(b int){fmt.Printf("debug: foo in main is %d and %d", foo, b)})))}
英文:
I've been trying to figure out why this is not working but am not sure. The error in the sandbox is
main.go:16: syntax error: unexpected {, expecting )
Code:
package mainimport "fmt"type handler func(a func(b int))func HandleSomething(h handler) {//...//d := h(5)//h(5)// ...}func main() {var foo intHandleSomething(handler(func(func(b int){fmt.Printf("debug: foo in main is %d and %d", foo, b)})))}
答案1
得分: 0
看一下为什么它无法编译可能会有帮助，将最内层的函数提取为一个参数，如 https://play.golang.org/p/QPBturZ6GG 所示。
我认为你可能在寻找以下类似的内容，但它不会做太多事情 https://play.golang.org/p/2tEEwoZRC6
package mainimport "fmt"type handler func(a func(b int))func HandleSomething(h handler) {//...//d := h(5)//h(5)// ...}func main() {var foo intHandleSomething(handler(func(a func(b int)) {//这没有意义，因为你无法访问b//fmt.Printf("debug: foo in main is %d and %d", foo, b)fmt.Printf("debug: foo in main is %d", foo)//你可以调用你的函数参数，如下所示a(6)a(7)}))}
以下示例可能会给你更多的玩耍空间
https://play.golang.org/p/BuxA8JXibG
英文:
To see why it won't compile it might be helpful to pull your innermost function out into an argument as shown at https://play.golang.org/p/QPBturZ6GG
I think you are looking for something like the following, but it won't do much
https://play.golang.org/p/2tEEwoZRC6
package mainimport "fmt"type handler func(a func(b int))func HandleSomething(h handler) {//...//d := h(5)//h(5)// ...}func main() {var foo intHandleSomething(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 likea(6)a(7)}))}
The following example might give you something more to play with
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