How is closure in golang function implemented?

Function closures in Go are implemented through nested functions, allowing internal functions to access variables in the scope of external functions. The specific steps are as follows: define an external function, receive parameters and return a closure function. Define a closure function to access external function variables internally. Returns a closure function that can still access the outer function variables even if the outer function has returned.

Implementation of function closure in Go

In Go, function closure is a function that allows functions to access its definition Techniques for variables in a domain. It does this by creating a nested function and returning it.

Implementing closures

The following code demonstrates how to implement closures:

func outerFunction(x int) func() int {
    return func() int {
        // 访问 outerFunction 中的变量 x
        return x
    }
}

In this case, the outerFunction function Returns an anonymous function that can access variables x in the outerFunction function, even if the outerFunction function has returned.

Practical case

This is a practical case using closure:

// 模拟一个累加器，每次调用都会增加计数器
func counter() func() int {
    var count int
    return func() int {
        count++
        return count
    }
}

func main() {
    // 创建一个闭包
    c := counter()

    // 多次调用该闭包，它将递增计数器
    fmt.Println(c())
    fmt.Println(c())
    fmt.Println(c())
}

The output is:

1
2
3

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