fl6.go

package main

import (
	"fmt"
	"sync"
)

type Character struct {
	Appearance string
	Name       string
}

var characterPool = sync.Map{}

func NewCharacter(appearance, name string) *Character {
	if character, ok := characterPool.Load(appearance); ok {
		return character.(*Character)
	}
	newCharacter := &Character{appearance, name}
	characterPool.Store(appearance, newCharacter)
	return newCharacter
}

func main() {
	character1 := NewCharacter("Soldier", "John")
	character2 := NewCharacter("Soldier", "Mike")
	character3 := NewCharacter("Zombie", "Zombie1")
	fmt.Printf("character1: %p %+v\n", character1, character1)
	fmt.Printf("character2: %p %+v\n", character2, character2)
	fmt.Printf("character3: %p %+v\n", character3, character3)
}