英文:
golang read private attribute of a struct in another package
问题
我理解，在Go语言中，我们有公有字段和私有字段。
package main
type User struct {
DisplayName string
title *string
}
DisplayName 是公有的，所以我可以从另一个包中读取它。title 是私有的，我不能直接读取它。
如果我添加一个公有方法，像这样：
package main
type User struct {
DisplayName string
title *string
}
func (user *User) PublicTitle() string {
return user.title
}
type EmployeeUser User
那么我应该能够通过 localUser.PublicTitle() 在另一个包中读取 title 吗？
package utility
var localUser *main.EmployeeUser
localUser.PublicTitle()
我尝试过，似乎不起作用。我有点困惑。
谢谢帮助。
英文:
I understand on golang we have public and private fields
package main
type User struct {
DisplayName string
title *string
}
Displayname is public so I can read it from another package. title is private I cannot read direclty
what about I add a public method like this
package main
type User struct {
DisplayName string
title *string
}
func (user *User) PublicTitle() string {
return user.title
}
type EmployeeUser User
So I should be able to read title by localUser.PublicTitle() in another package?
package utility
var localUser *main.EmployeeUser
localUser.PublicTitle()
I have tried it seems not working. I am a bit confused.
Thanks for help
答案1
得分: 2
类型EmployeeUser是一个新类型。当你基于现有类型定义一个新类型时，基类型的方法不会被提升到新类型中。
要实现这一点，你需要嵌入：
type EmployeeUser struct {
User
}
英文:
The type EmployeeUser is a new type. When you define a new type based on an existing one, the methods of base type are not promoted to the new type.
To do that, you have to embed:
type EmployeeUser struct {
User
}
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