How to implement callbacks using Golang function types?

Yes, you can use function types to implement callback functions in Go. The specific steps are as follows: declare a function type and specify the signature of the callback function. Define a function that accepts a function type as an argument. Pass the function that requires a callback to this function.

Implementing callbacks using Golang function types

In Go, function types allow you to declare functions as variables or pass them as arguments . This is useful when making callbacks, where one function passes another function as an argument.

Function type syntax

To declare a function type, use the following syntax:

func(参数类型) 返回值类型

For example, to declare a function type that takes no arguments and returns # For function types of ##int, you can use:

func() int

Implementing callbacks

To implement callbacks, please follow these steps:

Declare a function type that represents the function signature you wish to callback.
Define a function that accepts a function type as a parameter.
Pass the function you wish to callback to this function.

Practical Case

The following is a practical case using Go function types to implement callbacks:

package main

import "fmt"

type Callback func(int) int

func main() {
    // 声明一个函数类型
    var cb Callback

    // 定义一个接受回调函数作为参数的函数
    funcWithCallback := func(cb Callback) {
        result := cb(10)
        fmt.Println(result)
    }

    // 定义一个回调函数
    increment := func(num int) int {
        return num + 1
    }

    // 传递回调函数
    funcWithCallback(increment)
}

In this example, we declare There is a

Callback function type, which represents a function that does not accept any parameters and returns int. Then, we declare the funcWithCallback function, which accepts the Callback function type as a parameter. Finally, we define the increment function as the callback function and pass it to the funcWithCallback function. The result will be output as 11.

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