glist

package
v1.16.10 Latest Latest
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 Go to latest Published: Dec 2, 2021 License: MIT Imports: 5 Imported by: 0

Documentation

Overview

Package glist provides most commonly used doubly linked list container which also supports concurrent-safe/unsafe switch feature.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Element 

type Element = list.Element

Element the item type of the list.

type List 

type List struct {
	// contains filtered or unexported fields
}

List is a doubly linked list containing a concurrent-safe/unsafe switch. The switch should be set when its initialization and cannot be changed then.

func New 

func New(safe ...bool) *List

New creates and returns a new empty doubly linked list.

Example 
package main

import (
	"fmt"

	"github.com/rglujing/gf/container/glist"
)

func main() {
	n := 10
	l := glist.New()
	for i := 0; i < n; i++ {
		l.PushBack(i)
	}
	fmt.Println(l.Len())
	fmt.Println(l.FrontAll())
	fmt.Println(l.BackAll())
	for i := 0; i < n; i++ {
		fmt.Print(l.PopFront())
	}
	l.Clear()
	fmt.Println()
	fmt.Println(l.Len())

}

Output:

10
[0 1 2 3 4 5 6 7 8 9]
[9 8 7 6 5 4 3 2 1 0]
0123456789
0

func NewFrom 

func NewFrom(array []interface{}, safe ...bool) *List

NewFrom creates and returns a list from a copy of given slice <array>. The parameter <safe> is used to specify whether using list in concurrent-safety, which is false in default.

func (*List) Back 

func (l *List) Back() (e *Element)

Back returns the last element of list <l> or nil if the list is empty.

func (*List) BackAll 

func (l *List) BackAll() (values []interface{})

BackAll copies and returns values of all elements from back of <l> as slice.

func (*List) BackValue 

func (l *List) BackValue() (value interface{})

BackValue returns value of the last element of <l> or nil if the list is empty.

func (*List) Clear 

func (l *List) Clear()

See RemoveAll().

func (*List) Front 

func (l *List) Front() (e *Element)

Front returns the first element of list <l> or nil if the list is empty.

func (*List) FrontAll 

func (l *List) FrontAll() (values []interface{})

FrontAll copies and returns values of all elements from front of <l> as slice.

func (*List) FrontValue 

func (l *List) FrontValue() (value interface{})

FrontValue returns value of the first element of <l> or nil if the list is empty.

func (*List) InsertAfter 

func (l *List) InsertAfter(p *Element, v interface{}) (e *Element)

InsertAfter inserts a new element <e> with value <v> immediately after <p> and returns <e>. If <p> is not an element of <l>, the list is not modified. The <p> must not be nil.

func (*List) InsertBefore 

func (l *List) InsertBefore(p *Element, v interface{}) (e *Element)

InsertBefore inserts a new element <e> with value <v> immediately before <p> and returns <e>. If <p> is not an element of <l>, the list is not modified. The <p> must not be nil.

func (*List) Iterator 

func (l *List) Iterator(f func(e *Element) bool)

Iterator is alias of IteratorAsc.

func (*List) IteratorAsc 

func (l *List) IteratorAsc(f func(e *Element) bool)

IteratorAsc iterates the list readonly in ascending order with given callback function <f>. If <f> returns true, then it continues iterating; or false to stop.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/container/garray"

	"github.com/rglujing/gf/container/glist"
)

func main() {
	// concurrent-safe list.
	l := glist.NewFrom(garray.NewArrayRange(1, 10, 1).Slice(), true)
	// iterate reading from head using IteratorAsc.
	l.IteratorAsc(func(e *glist.Element) bool {
		fmt.Print(e.Value)
		return true
	})

}

Output:

12345678910

func (*List) IteratorDesc 

func (l *List) IteratorDesc(f func(e *Element) bool)

IteratorDesc iterates the list readonly in descending order with given callback function <f>. If <f> returns true, then it continues iterating; or false to stop.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/container/garray"

	"github.com/rglujing/gf/container/glist"
)

func main() {
	// concurrent-safe list.
	l := glist.NewFrom(garray.NewArrayRange(1, 10, 1).Slice(), true)
	// iterate reading from tail using IteratorDesc.
	l.IteratorDesc(func(e *glist.Element) bool {
		fmt.Print(e.Value)
		return true
	})
}

Output:

10987654321

func (*List) Join 

func (l *List) Join(glue string) string

Join joins list elements with a string <glue>.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/frame/g"

	"github.com/rglujing/gf/container/glist"
)

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

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

}

Output:

a,b,c,d

func (*List) Len 

func (l *List) Len() (length int)

Len returns the number of elements of list <l>. The complexity is O(1).

func (*List) LockFunc 

func (l *List) LockFunc(f func(list *list.List))

LockFunc locks writing with given callback function <f> within RWMutex.Lock.

Example 
package main

import (
	"container/list"
	"fmt"
	"github.com/rglujing/gf/container/garray"

	"github.com/rglujing/gf/container/glist"
)

func main() {
	// concurrent-safe list.
	l := glist.NewFrom(garray.NewArrayRange(1, 10, 1).Slice(), true)
	// 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,M,7,8,9,10]

func (*List) MarshalJSON 

func (l *List) MarshalJSON() ([]byte, error)

MarshalJSON implements the interface MarshalJSON for json.Marshal.

func (*List) MoveAfter 

func (l *List) MoveAfter(e, p *Element)

MoveAfter moves element <e> to its new position after <p>. If <e> or <p> is not an element of <l>, or <e> == <p>, the list is not modified. The element and <p> must not be nil.

func (*List) MoveBefore 

func (l *List) MoveBefore(e, p *Element)

MoveBefore moves element <e> to its new position before <p>. If <e> or <p> is not an element of <l>, or <e> == <p>, the list is not modified. The element and <p> must not be nil.

func (*List) MoveToBack 

func (l *List) MoveToBack(e *Element)

MoveToBack moves element <e> to the back of list <l>. If <e> is not an element of <l>, the list is not modified. The element must not be nil.

func (*List) MoveToFront 

func (l *List) MoveToFront(e *Element)

MoveToFront moves element <e> to the front of list <l>. If <e> is not an element of <l>, the list is not modified. The element must not be nil.

func (*List) PopBack 

func (l *List) PopBack() (value interface{})

PopBack removes the element from back of <l> and returns the value of the element.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/frame/g"

	"github.com/rglujing/gf/container/glist"
)

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

	fmt.Println(l.PopBack())

}

Output:

9

func (*List) PopBackAll 

func (l *List) PopBackAll() []interface{}

PopBackAll removes all elements from back of <l> and returns values of the removed elements as slice.

func (*List) PopBacks 

func (l *List) PopBacks(max int) (values []interface{})

PopBacks removes <max> elements from back of <l> and returns values of the removed elements as slice.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/frame/g"

	"github.com/rglujing/gf/container/glist"
)

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

	fmt.Println(l.PopBacks(2))

}

Output:

[9 8]

func (*List) PopFront 

func (l *List) PopFront() (value interface{})

PopFront removes the element from front of <l> and returns the value of the element.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/frame/g"

	"github.com/rglujing/gf/container/glist"
)

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

	fmt.Println(l.PopFront())

}

Output:

1

func (*List) PopFrontAll 

func (l *List) PopFrontAll() []interface{}

PopFrontAll removes all elements from front of <l> and returns values of the removed elements as slice.

func (*List) PopFronts 

func (l *List) PopFronts(max int) (values []interface{})

PopFronts removes <max> elements from front of <l> and returns values of the removed elements as slice.

Example 
package main

import (
	"fmt"
	"github.com/rglujing/gf/frame/g"

	"github.com/rglujing/gf/container/glist"
)

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

	fmt.Println(l.PopFronts(2))

}

Output:

[1 2]

func (*List) PushBack 

func (l *List) PushBack(v interface{}) (e *Element)

PushBack inserts a new element <e> with value <v> at the back of list <l> and returns <e>.

func (*List) PushBackList 

func (l *List) PushBackList(other *List)

PushBackList inserts a copy of an other list at the back of list <l>. The lists <l> and <other> may be the same, but they must not be nil.

func (*List) PushBacks 

func (l *List) PushBacks(values []interface{})

PushBacks inserts multiple new elements with values <values> at the back of list <l>.

func (*List) PushFront 

func (l *List) PushFront(v interface{}) (e *Element)

PushFront inserts a new element <e> with value <v> at the front of list <l> and returns <e>.

func (*List) PushFrontList 

func (l *List) PushFrontList(other *List)

PushFrontList inserts a copy of an other list at the front of list <l>. The lists <l> and <other> may be the same, but they must not be nil.

func (*List) PushFronts 

func (l *List) PushFronts(values []interface{})

PushFronts inserts multiple new elements with values <values> at the front of list <l>.

func (*List) RLockFunc 

func (l *List) RLockFunc(f func(list *list.List))

RLockFunc locks reading with given callback function <f> within RWMutex.RLock.

Example 
package main

import (
	"container/list"
	"fmt"
	"github.com/rglujing/gf/container/garray"

	"github.com/rglujing/gf/container/glist"
)

func main() {
	// concurrent-safe list.
	l := glist.NewFrom(garray.NewArrayRange(1, 10, 1).Slice(), true)
	// 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()
}

Output:

12345678910
10987654321

func (*List) Remove 

func (l *List) Remove(e *Element) (value interface{})

Remove removes <e> from <l> if <e> is an element of list <l>. It returns the element value e.Value. The element must not be nil.

func (*List) RemoveAll 

func (l *List) RemoveAll()

RemoveAll removes all elements from list <l>.

func (*List) Removes 

func (l *List) Removes(es []*Element)

Removes removes multiple elements <es> from <l> if <es> are elements of list <l>.

func (*List) Size 

func (l *List) Size() int

Size is alias of Len.

func (*List) String 

func (l *List) String() string

String returns current list as a string.

func (*List) UnmarshalJSON 

func (l *List) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.

func (*List) UnmarshalValue 

func (l *List) UnmarshalValue(value interface{}) (err error)

UnmarshalValue is an interface implement which sets any type of value for list.

Source Files

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