使用 reflecting 和 gob 两种方式，性能比较结果：
Deep copy with reflecting is 10x faster than gob and it will save more memory.
reflecting 使用库 https://github.com/mohae/deepcopy 76 过程参见 https://xuri.me/2018/06/17/deep-copy-object-with-reflecting-or-gob-in-go.html 60
2.通过反射的方式拷贝结构
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package mainimport ("fmt""reflect""time")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 (self *Hero) Print() { fmt.Printf("Id=%d, Level=%d
", self.Id, self.Level) for _, v := range self.Skills { fmt.Printf("%v
", *v) }}func (self *Player) Print() { fmt.Printf("Id=%d, Level=%d
", self.Id, self.Level) for _, v := range self.Heroes { v.Print() } for _, v := range self.Equips { fmt.Printf("%+v
", *v) }}type Interface interface { DeepCopy() interface{}}func Copy(src interface{}) interface{} { if src == nil { return nil } original := reflect.ValueOf(src) cpy := reflect.New(original.Type()).Elem() copyRecursive(original, cpy) return cpy.Interface()}func copyRecursive(src, dst reflect.Value) { if src.CanInterface() { if copier, ok := src.Interface().(Interface); ok { dst.Set(reflect.ValueOf(copier.DeepCopy())) return } } switch src.Kind() { case reflect.Ptr: originalValue := src.Elem() if !originalValue.IsValid() { return } dst.Set(reflect.New(originalValue.Type())) copyRecursive(originalValue, dst.Elem()) case reflect.Interface: if src.IsNil() { return } originalValue := src.Elem() copyValue := reflect.New(originalValue.Type()).Elem() copyRecursive(originalValue, copyValue) dst.Set(copyValue) case reflect.Struct: t, ok := src.Interface().(time.Time) if ok { dst.Set(reflect.ValueOf(t)) return } for i := 0; i < src.NumField(); i++ { if src.Type().Field(i).PkgPath != "" { continue } copyRecursive(src.Field(i), dst.Field(i)) } case reflect.Slice: if src.IsNil() { return } dst.Set(reflect.MakeSlice(src.Type(), src.Len(), src.Cap())) for i := 0; i < src.Len(); i++ { copyRecursive(src.Index(i), dst.Index(i)) } case reflect.Map: if src.IsNil() { return } dst.Set(reflect.MakeMap(src.Type())) for _, key := range src.MapKeys() { originalValue := src.MapIndex(key) copyValue := reflect.New(originalValue.Type()).Elem() copyRecursive(originalValue, copyValue) copyKey := Copy(key.Interface()) dst.SetMapIndex(reflect.ValueOf(copyKey), copyValue) } default: dst.Set(src) }}func main() { p1 := NewPlayer() p2 := Copy(p1).(*Player) fmt.Println(reflect.DeepEqual(p1, p2))}// 输出true// benchamark测试func BenchmarkReflect(b *testing.B) { p1 := NewPlayer() for i:=0 ; i<b.N ; i++ { Copy(p1) }}goos: windowsgoarch: amd64pkg: game.lab/go-deepcopy/src/reflect200000 10725 ns/opPASS |