Go结构中的无名字段？

Question

package main

import "fmt"

type myType struct {
    string
}

func main() {
    obj := myType{"Hello World"}

    fmt.Println(obj)
}

What is the purpose of nameless fields in structs?

Is it possible to access these fields like you can do with named fields?

Answer 1

See "Embedding in Go ": you embed an anonymous field in a struct: this is generally used with an embedded struct, not a basic type like string. That type has no "promoted field" to expose.

A field or method f of an anonymous field in a struct x is called promoted if x.f is a legal selector that denotes that field or method f.

Promoted fields act like ordinary fields of a struct except that they cannot be used as field names in composite literals of the struct.

(here string has no field in itself)

See an example of type embedding in "Embeddding when to use pointer".

Is it possible to access these fields like you can do with named fields?

A fmt.Println(obj.string) would return Hello World instead of {Hello World}.