How to access an embedded struct inside a pointer slice field of a struct-Golang-php.cn

How to access an embedded struct inside a pointer slice field of a struct

WBOY

Release： 2024-02-09 08:27:51

forward

374 people have browsed it

How to access an embedded struct inside a pointer slice field of a struct

php editor Strawberry introduces you how to access the embedded structure in the pointer slice field of the structure. In Go language, we can use pointer slices to store structure data and embed other structures as fields in the structure. However, accessing embedded structure fields requires some special operations. This article will explain in detail how to access these embedded structure fields through pointer slicing to help you better understand and apply this feature. Whether you are a beginner or an experienced Go developer, this article will provide you with practical tips and sample code to help you master this knowledge easily.

Question content

I want to add functionality to get the first element when the data is []*struct.

func getencfields(t reflect.type, list map[string]int) {
    for t.kind() == reflect.ptr {
        t = t.elem()
    }
    if t.kind() == reflect.struct {
        for i := 0; i < t.numfield(); i++ {
            field := t.field(i)
            tag := field.tag.get("bson")
            if containstag(tag, "encr") {
                list[getfieldname(field, tag)]++
            }
            getencfields(field.type, list)
        }
    }

Copy after login

In this code, I need to add functionality when the data is []*struct. This is the type of structure to be passed in this function.

type Customer struct {
    Name     string    `json:"name" bson:"name"`
    Acnumber int64     `json:"acnumber" bson:"acnumber,encr"`
    Number   int64     `json:"number" bson:"number,encr"`
    Address  []*Address `json:"address" bson:"address"`
}
type Address struct {
    Mail string `json:"mail" bson:"mail,encr"`
}

Copy after login

Thank you for your support

Workaround

Drill down into arrays, slices, and maps just like pointers.

func getEncFields(t reflect.Type, list map[string]int) {
    for t.Kind() == reflect.Ptr || t.Kind() == reflect.Slice || t.Kind() == reflect.Array || t.Kind() == reflect.Map {
        t = t.Elem()
    }
    if t.Kind() == reflect.Struct {
        for i := 0; i < t.NumField(); i++ {
            field := t.Field(i)
            tag := field.Tag.Get("bson")
            if containsTag(tag, "encr") {
                list[getFieldName(field, tag)]++
            }
            getEncFields(field.Type, list)
        }
    }
}

Copy after login

//m.sbmmt.com/link/b4572f47b7c69e27b8e46646d9579e67 p>

The above is the detailed content of How to access an embedded struct inside a pointer slice field of a struct. For more information, please follow other related articles on the PHP Chinese website!