如何在结构上定义可变参数字段？ 走

Question

I need a data structure which accepts name / value pairs in addition to custom fields. How can I define a such structure ?

e.g.

type mybasket struct {
    Coupons string
    Amount int
    ....... // string or int
}

Answer 1

I'd recommend defining setter and getter methods on the type, and store the values in a slice in the struct.

For example:

package main

import "fmt"

type kv struct {
    k, v string
}

type mybasket struct {
    Coupons  string
    Amount   int
    Contents []kv
}

func (t *mybasket) SetContents(c ...kv) {
    t.Contents = c
    return
}

func (t *mybasket) GetContents() []kv {
    return t.Contents
}

func main() {
    T := &mybasket{"couponlist", 100, []kv{}} // New Basket
    kvs := []kv{{"foo", "bar"}, {"baz", "bat"}} // Contents
    T.SetContents(kvs...) // Set Contents
    fmt.Printf("%v", T.GetContents()) // Get Contents
}

Prints:

[{foo bar} {baz bat}]

Playground