What is the method alias of golang? How to understand

Golang is a very popular programming language favored by developers because of its simplicity, efficiency, cross-platform and concurrency. Among them, methods are an important concept in Golang. Through methods, we can define some operations on the structure to make the code more object-oriented. In this article, we will introduce a concept closely related to methods-method aliases.

What is the method alias?

In Golang, methods belong to a type, so a type can have multiple methods. However, in some cases, we need to define methods with the same name on the same type, such as methods with the same name in two different packages.

At this time, you need to use method aliases. Method aliasing refers to defining a method as an alias of another method, so that methods with the same name can be defined in different packages.

Method alias syntax in Golang

The syntax for defining method aliases in Golang is as follows:

type T struct{}

func (t *T) method1() {}
func (t *T) method2() {}

type T1 T

func (t *T1) method2() {}

In the above code, we define a structure type T, And two methods method1 and method2 are defined on it. Then, we define a type T1 with the underlying type T and define the method2 method on it.

In this example, the syntax of type T1 T means that type T is defined as the underlying type of type T1, and the method2 method can be defined on the T1 type.

Usage examples of method aliases

Next, we will demonstrate the use of method aliases through a specific example.

package main

import (
    "fmt"
)

type MyInt int

func (i MyInt) add(j int) MyInt {
    return MyInt(j) + i
}

type MyAlias = MyInt

func main() {
    var a MyInt = 1
    var b MyAlias = 2

    fmt.Println(a.add(2)) // 输出 3
    fmt.Println(b.add(3)) // 输出 5
}

In the above code, we define a type MyInt and define an add method on it. Then, define the MyInt type as an alias of the MyAlias ​​type through type MyAlias ​​= MyInt. Finally, in the main function, a variable a of type MyInt and a variable b of type MyAlias ​​are declared respectively, and their add method is called, and the results are output.

As can be seen from the above example, method aliases allow us to define methods with the same name in different packages, and to explicitly identify the alias of a type. At the same time, when calling methods, we can use the original type and alias type to call methods with the same name.

Summary

Method alias is a special concept in Golang, which allows us to define methods with the same name on the same type. When you need to define methods with the same name in different packages, you can use method aliases to meet your needs.

It is worth noting that after defining a method alias, the alias type and the original type are not the same type, they just have the same name. When using method aliases, you need to make it clear which type of method is being called.

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