链表类型-基本使用

基础使用

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
)

func main() {
    // Not concurrent-safe in default.
    l := glist.New()

    // Push
    l.PushBack(1) //从后面插入值
    l.PushBack(2) //从后面插入值
    e := l.PushFront(0) //从前面插入值

    // Insert
    l.InsertBefore(e, -1) //从0的前面插入值
    l.InsertAfter(e, "a") //从0的后面插入值
    fmt.Println(l)

    // Pop Pop 出栈后，从list里移除
    fmt.Println(l.PopFront()) // 从前面出栈，返回出栈的值
    fmt.Println(l.PopBack()) //从后面出栈
    fmt.Println(l)

    // All
    fmt.Println(l.FrontAll()) //正序返回一个复本
    fmt.Println(l.BackAll())  //逆序返回一个复本

    // Output:
    // [-1,0,"a",1,2]
    // -1
    // 2
    // [0,"a",1]
    // [0 "a" 1]
    // [1 "a" 0]
}

链表遍历

该示例中我们将通过读锁和写锁遍历一个并发安全的链表，分别通过 RLockFunc 和 LockFunc 实现。执行后，输出结果为：

package main

import (
    "container/list"
    "fmt"
    "github.com/gogf/gf/v2/container/garray"
    "github.com/gogf/gf/v2/container/glist"
)

func main() {
    // concurrent-safe list.
    l := glist.NewFrom(garray.NewArrayRange(1, 9, 1).Slice(), true)
    fmt.Println(l)
    // iterate reading from head.
    l.RLockFunc(func(list *list.List) {
        length := list.Len()
        if length > 0 {
            for i, e := 0, list.Front(); i < length; i, e = i+1, e.Next() {
                fmt.Print(e.Value)
            }
        }
    })
    fmt.Println()
    // iterate reading from tail.
    l.RLockFunc(func(list *list.List) {
        length := list.Len()
        if length > 0 {
            for i, e := 0, list.Back(); i < length; i, e = i+1, e.Prev() {
                fmt.Print(e.Value)
            }
        }
    })

    fmt.Println()

    // iterate reading from head using IteratorAsc.
    l.IteratorAsc(func(e *glist.Element) bool {
        fmt.Print(e.Value)
        return true
    })
    fmt.Println()
    // iterate reading from tail using IteratorDesc.
    l.IteratorDesc(func(e *glist.Element) bool {
        fmt.Print(e.Value)
        return true
    })

    fmt.Println()

    // iterate writing from head.
    l.LockFunc(func(list *list.List) {
        length := list.Len()
        if length > 0 {
            for i, e := 0, list.Front(); i < length; i, e = i+1, e.Next() {
                if e.Value == 6 {
                    e.Value = "M"
                    break
                }
            }
        }
    })
    fmt.Println(l)

    // Output:
    // [1,2,3,4,5,6,7,8,9]
    // 123456789
    // 987654321
    // 123456789
    // 987654321
    // [1,2,3,4,5,M,7,8,9]

Push* 元素项入栈

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
    "github.com/gogf/gf/v2/frame/g"
)

func main() {
    l := glist.NewFrom(g.Slice{1, 2, 3, 4, 5})

    l.PushBack(6)
    fmt.Println(l)

    l.PushFront(0)
    fmt.Println(l)

    // 正数从右边入栈
    l.PushBacks(g.Slice{7, 8})
    fmt.Println(l)

    // 负数从左边入栈
    l.PushFronts(g.Slice{-1, -2})
    fmt.Println(l)

    l.PushFrontList(glist.NewFrom(g.Slice{"a", "b", "c"}))
    l.PushBackList(glist.NewFrom(g.Slice{"d", "e", "f"}))
    fmt.Println(l)

    // Output:
    // [1,2,3,4,5,6]
    // [0,1,2,3,4,5,6]
    // [0,1,2,3,4,5,6,7,8]
    // [-2,-1,0,1,2,3,4,5,6,7,8]
    // ["a","b","c",-2,-1,0,1,2,3,4,5,6,7,8,"d","e","f"]

}

Pop* 元素项出栈

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
    "github.com/gogf/gf/v2/frame/g"
)

func main() {
    l := glist.NewFrom(g.Slice{1, 2, 3, 4, 5, 6, 7, 8, 9})

    fmt.Println(l.PopBack())
    fmt.Println(l.PopBacks(2))
    fmt.Println(l.PopFront())
    fmt.Println(l.PopFronts(2))

    fmt.Println(glist.NewFrom(g.Slice{"a", "b", "c", "d"}).PopFrontAll())
    fmt.Println(glist.NewFrom(g.Slice{"a", "b", "c", "d"}).PopBackAll())

    // Output:
    // 9
    // [8 7]
    // 1
    // [2 3]
    // [4,5,6]
    // [a b c d]
    // [d c b a]
}

Move*/Insert* 元素项移动、插入

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
    "github.com/gogf/gf/v2/frame/g"
)

func main() {
    l := glist.NewFrom(g.Slice{1, 2, 3, 4, 5, 6, 7, 8, 9})

    l.MoveToBack(l.Front()) //将第一个元素(1)移动最右边  [2,3,4,5,6,7,8,9,1]
    l.MoveToFront(l.Back().Prev()) //将最后一项的前一个元素(9)移动最左边  [9,2,3,4,5,6,7,8,1]
    fmt.Println(l)

    // 将2到栈首元素的前面
    l.MoveBefore(l.Front().Next(), l.Front())
    // 将8到栈尾元素的后面
    l.MoveAfter(l.Back().Prev(), l.Back())
    fmt.Println(l)

    // 在栈尾元素前插入新元素
    l.InsertBefore(l.Back(), "a")
    // 在栈首元素后插入新元素
    l.InsertAfter(l.Front(), "b")

    // Output:
    // [9,2,3,4,5,6,7,8,1]
    // [2,9,3,4,5,6,7,1,8]
    // [2,"b",9,3,4,5,6,7,1,"a",8]
}

Join 元素项串连

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
    "github.com/gogf/gf/v2/frame/g"
)

func main() {
    var l glist.List
    l.PushBacks(g.Slice{"a", "b", "c", "d"})

    fmt.Println(l.Join(","))

    // Output:
    // a,b,c,d
}

Remove* 元素项移除

package main

import (
    "fmt"
    "github.com/gogf/gf/v2/container/glist"
    "github.com/gogf/gf/v2/frame/g"
)

func main() {
    l := glist.NewFrom(g.Slice{0, 1, 2, 3, 4, 5, 6, 7, 8, 9})
    fmt.Println(l)

    fmt.Println(l.Remove(l.Front()))
    fmt.Println(l)

    l.Removes([]*glist.Element{l.Front(), l.Front().Next()})
    fmt.Println(l)

    l.RemoveAll()
    fmt.Println(l)

    // Output:
    // [0,1,2,3,4,5,6,7,8,9]
    // 0
    // [1,2,3,4,5,6,7,8,9]
    // [3,4,5,6,7,8,9]
    // [] }

JSON 序列化/反序列

glist 容器实现了标准库 json 数据格式的序列化/反序列化接口。

• Marshal

package main

import (
      "encoding/json"
      "fmt"
      "github.com/gogf/gf/v2/container/glist"
      "github.com/gogf/gf/v2/frame/g"
)

func main() {
      type Student struct {
          Id     int
          Name   string
          Scores *glist.List
      }
      s := Student{
          Id:     1,
          Name:   "john",
          Scores: glist.NewFrom(g.Slice{100, 99, 98}),
      }
      b, _ := json.Marshal(s)
      fmt.Println(string(b))

      // Output:
      // {"Id":1,"Name":"john","Scores":[100,99,98]}
}

• Unmarshal

package main

import (
      "encoding/json"
      "fmt"
      "github.com/gogf/gf/v2/container/glist"
)

func main() {
      b := []byte(`{"Id":1,"Name":"john","Scores":[100,99,98]}`)
      type Student struct {
          Id     int
          Name   string
          Scores *glist.List
      }
      s := Student{}
      json.Unmarshal(b, &s)
      fmt.Println(s)

      // Output:
      // {1 john [100,99,98]}
}