Go: constraint a generic type to implement an interface with a pointer receiver

pointercontraint.go

package main

// Demonstrates how to constraint a generic type to implement an interface with a pointer receiver
// inspired by this SO answer: https://stackoverflow.com/a/71444968

import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	if res, err := ParseAll[Dummy]("1,2,3,4,5635,2,2,34,5"); err == nil {
		// displays: [{ID:1} {ID:2} {ID:3} {ID:4} {ID:5635} {ID:2} {ID:2} {ID:34} {ID:5}]
		fmt.Printf("%+v", res)
	} else {
		fmt.Println(err)
	}
}

type FromString interface {
	FromString(string) error
}

type Dummy struct {
	ID int
}

func (id *Dummy) FromString(value string) error {
	if res, err := strconv.Atoi(value); err == nil {
		*id = Dummy{ID: res}
		return nil
	} else {
		return err
	}
}

func ParseAll[T any, PT interface {
	*T
	FromString
}](values string) ([]T, error) {
	stringList := strings.Split(values, ",")
	objs := make([]T, len(stringList))
	for i, s := range stringList {
		var obj PT = &objs[i]
		err := obj.FromString(s)
		if err != nil {
			return nil, err
		}
	}
	return objs, nil
}