What is the underlying philosophy of function types in Go?

A function type in Go is a tuple with input parameter types and output return types. Function types can be passed as value or reference, by default passed as value, explicitly passed as reference requires the use of *. In practice, function types can be used to create reusable functions, such as passing functions as arguments to other functions.

The underlying principles of function types in Go

Introduction
In the Go language, functions Can be passed as a value or as a parameter. This gives functions the same status as other types such as int, float, and string, making code more reusable and readable. This article will delve into the underlying principles of function types in Go, including their representation, delivery mechanism, and practical cases.

Representation of function types
Function types are declared using the func keyword in the Go language. It is essentially a structure with a tuple of input parameter types and an output return type. For example, the following code defines a function type that takes an int32 input parameter and returns a float64 value:

type MyFuncType func(int32) float64

Passing of function types
Function types can be passed as values ​​or references . When passed as value, a copy of the function will be created and passed. When passed as a reference, the address of the function is passed. By default, function types are passed as values.

To explicitly pass a function type as a reference, use *. For example:

func TakeFunc(f *MyFuncType) {}

Practical case
The following is a simple example using function types:

package main

import "fmt"

type MyFuncType func(int32) float64

func main() {
    // 定义函数类型
    var f MyFuncType

    // 分配函数
    f = func(i int32) float64 {
        return float64(i) * 2.0
    }

    // 调用函数，传递引用
    fmt.Println(f(10)) // 输出：20
}

In this example, the MyFuncType type Used to represent a function that takes an int32 input parameter and returns a float64 value. Function f assigns an anonymous function that multiplies the input value by 2. Function f is then passed as a reference to function main and used to calculate and print twice 10.

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