Video source ：B standing 《golang Introduction to project practice [2021 newest Go Language course , There is no nonsense , Dry only ！ Ongoing update ...]》

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go Structures can be like ordinary variables , As an argument to a function , Pass to function , There are two situations ：

1. Direct transfer structure , This is a copy （ Copy ）, The contents of the outer structure will not be changed inside the function
2. Pass structure pointer , Inside the function , Able to change the content of external structure

Direct transfer structure

example

package main

import "fmt"

type Person struct {
    id   int
    name string
}

func showPerson(person Person) {
    person.id = 1
    person.name = "kite"
    fmt.Printf("person: %v\n", person)
}

func main() {
    person := Person{1, "tom"}
    fmt.Printf("person: %v\n", person)
    fmt.Println("-------------------")
    showPerson(person)
    fmt.Println("-------------------")
    fmt.Printf("person: %v\n", person)
}

Running results

[Running] go run "/Users/guoliang/SynologyDrive/ software development /go/golang Introduction to project practice /goproject/360duote.com/pro01/tempCodeRunnerFile.go"
person: {1 tom}
-------------------
person: {1 kite}
-------------------
person: {1 tom}

As you can see from the results , The contents of the structure are changed inside the function , The outside of the function has not been changed

Pass structure pointer

example

package main

import "fmt"

type Person struct {
    id   int
    name string
}

func showPerson(person *Person) {
    person.id = 1
    person.name = "kite"
    fmt.Printf("person: %v\n", person)
}

func main() {
    person := Person{1, "tom"}
    fmt.Printf("person: %v\n", person)
    fmt.Println("-------------------")
    showPerson(&person)
    fmt.Println("-------------------")
    fmt.Printf("person: %v\n", person)
}

Running results

[Running] go run "/Users/guoliang/SynologyDrive/ software development /go/golang Introduction to project practice /goproject/360duote.com/pro01/test.go"
person: {1 tom}
-------------------
person: &{1 kite}
-------------------
person: {1 kite}