How to use a struct field in another struct without referencing it as a key

In the development of PHP, we often encounter the situation of using the fields of another structure in one structure. However, referencing it directly as a key can lead to cluttered and unmaintainable code. So how to use structure fields in another structure? PHP editor Baicao provides you with a concise and clear solution to make your code clearer and easier to read. Let’s take a look below!

Question content

I want to insert a structure field into another structure without having to use the structure name.

I know I can do this:

type person struct { name string } type user struct { person email, password string }

But it will produce this structure:

user := user{person: person{name: ""}, email: "", password: ""}

How can I do something like this:

type person struct { name string } type user struct { name person.name // here email, password string }

Use it like this

user := User{Name: "", Email: "", Password: ""}

is it possible?

Solution

Simply put, it cannot be done using the current language implementation.

When initializing a literal, you need to be explicit (or, in other words:literal![sic]). Sinceusercontainsperson, the literalusermust contain the literalperson, as follows:

u := user{ person: person{ name: "bob", }, email: "[email protected]", password: "you're kidding right?", }

However, once you have avariableof typeuser, you can leverage the anonymous field to set (or get) the anonymousperson# viauser## ofname:

u := user{} u.name = "bob" u.email = "[email protected]", u.password = "you're kidding right?",

personcould be initialized the way you are looking for:

u := user{ name: "bob" }

userstructure andaddits ownnamefield:

type user struct { person name string email string password string }

canobviously initialize the newnamefield:

u := user{ name: "bob" }

user.person.namebefore, but now it is initializinguser.name. not good.

namefield inuseralreadysimilarly "destroy" theuservariable on thename Unqualified reference to:

u.name = "bob" // used to set user.person.name, now sets user.name

personfields, theuser.person.namefield is marshaled by default to json as the "name" field:

{ "name": "", "email": "", "password": "" }

namefield is added,thisis the field marshalled as"name", anduser.person.nameFields are not grouped at all>.

jsontag touser.person.name, like

type user struct { person `json:"personname"` name string email string password string }

nowpersonis marshaled into anobjectwith anamefield:

{ "PersonName": { "Name": "" }, "Name": "", "Email": "", "Password": "" }

This can happen if you try to change the name of a marshaled field for an anonymousperson, even thoughuserdoes not have anamefield.

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