go中的深度拷贝方式
1.使用json的序列化和反序列化
通过将原来的结构序列化成byte数组，然后将byte数组反序列化到
目标结构的方式来进行深度拷贝。相关代码如下：
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package main
import (
"encoding/json"
"fmt"
"reflect"
)type (
Player struct {
Id int
Level int
Heroes map[int]*Hero
Equips []*Equip
}
Hero struct {
Id int
Level int
Skills []*Skill
}
Equip struct {
Id int
Level int
}
Skill struct {
Id int
Level int
}
)func NewHero() *Hero {
return &Hero{
Id: 1,
Level: 1,
Skills: append([]*Skill{NewSkill()}, NewSkill(), NewSkill()),
}
}func NewSkill() *Skill {
return &Skill{1, 1}
}func NewEquip() *Equip {
return &Equip{1, 1}
}func NewPlayer() *Player {
return &Player{
Id: 1,
Level: 1,
Heroes: map[int]*Hero{1: NewHero(), 2: NewHero(), 3: NewHero()},
Equips: append([]*Equip{NewEquip()}, NewEquip(), NewEquip()),
}
}func CopyByJson(dst interface{}, src interface{}) error {
if dst == nil {
return fmt.Errorf("dst cannot be nil")
}
if src == nil {
return fmt.Errorf("src cannot be nil")
}
bytes, err := json.Marshal(src)
if err != nil {
return fmt.Errorf("Unable to marshal src: %s", err)
}
err = json.Unmarshal(bytes, dst)
if err != nil {
return fmt.Errorf("Unable to unmarshal into dst: %s", err)
}
return nil
}func (self *Hero) Print() {
fmt.Printf("Id=%d, Level=%d\n", self.Id, self.Level)
for _, v := range self.Skills {
fmt.Printf("%v\n", *v)
}
}func (self *Player) Print() {
fmt.Printf("Id=%d, Level=%d\n", self.Id, self.Level)
for _, v := range self.Heroes {
v.Print()
}
for _, v := range self.Equips {
fmt.Printf("%+v\n", *v)
}
}func main() {
p1 := NewPlayer()
p2 := new(Player)
CopyByJson(p2, p1)
fmt.Println(reflect.DeepEqual(p1, p2))
p2.Print()
}output:true//对应的benchmarkfunc BenchmarkCopyByJson(b *testing.B) {
p1 := NewPlayer()
p2 := new(Player)
for i:=0 ; i<b.N ; i++ {
CopyByJson(p2, p1)
}
}goos: windowsgoarch: amd64pkg: game.lab/go-deepcopy/src/main
100000 21600 ns/opPASS |