Learn more about the definition and use of the Golang method with the same name

Golang is a strongly typed, statically compiled language developed by Google. Its concise syntax and efficiency make it the language of choice for many Internet companies. Methods with the same name are an interesting grammatical feature in this language. This article will introduce the definition, usage scenarios and precautions of the Golang method with the same name.

1. Definition of methods with the same name

In Golang, methods with the same name refer to multiple methods with the same method name. These methods can appear in the same type or in different types.

Methods with the same name must meet the following conditions:

(1) They must be defined on different receiver types;
(2) They must have different parameter lists;
(3) Their return values ​​can be different, but the method names must be the same.

For example, the following is a structure that defines two methods with the same name:

type Person struct{
    Name string
    Age int
}

func (p Person) Print(){
    fmt.Printf("Name: %s, Age: %d", p.Name, p.Age)
}

func (p *Person) Print(){
    fmt.Printf("Name: %s, Age: %d", p.Name, p.Age)
}

In the above example, the Person structure defines two methods with the same name, Print. The first Print method receives a value of type Person as the receiver, while the second Print method receives a pointer to the Person type as the receiver.

2. Usage of methods with the same name

The usage scenarios of methods with the same name are similar to ordinary methods. You can use dot notation to call methods on objects, or you can call methods through type names. .

The following is an example of using a method with the same name:

p := Person{
    Name: "Tom",
    Age: 18,
}

p.Print() // Name: Tom, Age: 18

pp := &p
pp.Print() // Name: Tom, Age: 18

In the above example, we used the same object to call two methods. Since the first Print method receives a Person type value as the receiver, we can use p.Print() to call it. The second Print method receives a pointer type value as the receiver, so we need to use a pointer to p to call it.

3. Notes

Although the method with the same name is supported in Golang, you need to pay attention to the following points during use:

(1 ) Methods with the same name must be defined on different receiver types;
(2) The parameter list of the method with the same name cannot be the same;
(3) The return value of the method with the same name can be different;
(4) If a type If two methods with the same name are defined, when calling a method on this type, the compiler will select the appropriate method based on the receiver type.

For the Person structure in the above example, if we define it as follows:

type Person struct{
    Name string
    Age int
}

func (p *Person) Print(){
    fmt.Printf("Name: %s, Age: %d", p.Name, p.Age)
}

func (p *Person) Print(){
    fmt.Printf("Name: %s, Age: %d", p.Name, p.Age)
}

The compiler will report the following error:

redeclared method Person.Print

Because we defined two parameters List of methods with the same name.

Summary

In this article, we introduced the method of the same name in Golang. Methods with the same name are an interesting syntax feature that allows us to define the same method name on different receiver types. There are some limitations to be aware of when using methods with the same name, but using it wisely can improve the readability and maintainability of your code.

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