Golang Parcel Case Pattern

This is a creation in Article, where the information may have evolved or changed.

Learning Golang also has a period of time, but the concept of the package is not very clear, here to simulate a single example of the implementation

• Deepened the understanding of the package, the use of variable scope in the package
• Understanding the scope of a package global variable

Directory structure

Mian Method Main.go

package mainimport (    "log"    "p/p1"    _ "t")func main() {    log.Print("-------下面是main-------")    p1.Say()}

Package t T.go

package timport (    "p/p1")func init() {    a := p1.NewPeople()    a.SetName("tttttttt")    a.SetAge(188)    p1.Say()}

Package p/p1 P1.go

package p1import (    "log")var (    single *People)type People struct {    Name string    Age  int}func NewPeople() *People {    if single == nil {        single = new(People)    }    log.Print("new People", single, &single)    return single}func (p *People) SetName(name string) {    p.Name = name}func (p *People) SetAge(age int) {    p.Age = age}func Say() {    log.Print("Say", single, &single)}

Result output

• The t p1 value after initialization is initialized and output initialized
• From the results can be seen whether in the package t or mian inside the package, p1 the variable singole is the same address, that is, the implementation of a single case
• As long as the initialization succeeds, importing in any package p1 can be done directly using the variable Singole