代码
package slice
import (
"fmt"
"errors"
)
type Slice []interface{}
func NewSlice() Slice {
return make(Slice, 0)
}
func (this* Slice) Add(elem interface{}) error {
for _, v := range *this {
if isEqual(v, elem) {
fmt.Printf("Slice:Add elem: %v already exist\n", elem)
return errors.New("ERR_ELEM_EXIST")
}
}
*this = append(*this, elem)
fmt.Printf("Slice:Add elem: %v succ\n", elem)
return nil
}
func (this* Slice) Remove(elem interface{}) error {
found := false
for i, v := range *this {
if isEqual(v, elem) {
if i == len(*this) - 1 {
*this = (*this)[:i]
} else {
*this = append((*this)[:i], (*this)[i+1:]...)
}
found = true
break
}
}
if !found {
fmt.Printf("Slice:Remove elem: %v not exist\n", elem)
return errors.New("ERR_ELEM_NT_EXIST")
}
fmt.Printf("Slice:Remove elem: %v succ\n", elem)
return nil
}
func isEqual(a, b interface{}) bool {
if comparable, ok := a.(Comparable); ok {
return comparable.IsEqual(b)
} else {
return a == b
}
}
type Comparable interface {
IsEqual(obj interface{}) bool
}
对象demo
type Student struct {
id string
name string
}
func (this Student) IsEqual(obj interface{}) bool {
if student, ok := obj.(Student); ok {
return this.GetId() == student.GetId()
}
panic("unexpected type")
}
func (this Student) GetId() string {
return this.id
}
