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'------------------------------------------------------------------------------------- ' 名前 : Node ' 概要 : リストのノード '------------------------------------------------------------------------------------- Public Class Node Private m_Next As Node Private m_Prev As Node Private m_Value As Integer ' 次のノード Public Property [Next]() As Node Get Return m_Next End Get Set(ByVal Value As Node) m_Next = Value If Not m_Next Is Nothing Then m_Next.SetPrev(Me) End Set End Property ' 前のノード Public Property Prev() As Node Get Return m_Prev End Get Set(ByVal Value As Node) m_Prev = Value If Not m_Prev Is Nothing Then m_Prev.SetNext(Me) End Set End Property ' ノードの保持する値 Public Property Value() As Integer Get Return m_Value End Get Set(ByVal Value As Integer) m_Value = Value End Set End Property ' コンストラクタ <DebuggerStepThrough()> _ Public Sub New(ByVal val As Integer) Me.New(val, Nothing, Nothing) End Sub ' コンストラクタ <DebuggerStepThrough()> _ Public Sub New(ByVal val As Integer, ByVal [next] As Node, ByVal prev As Node) Me.Value = val Me.Next = [next] Me.Prev = prev End Sub ' 次のノードを設定 <DebuggerStepThrough()> _ Public Sub SetNext(ByVal [next] As Node) m_Next = [next] End Sub ' 前のノードを設定 <DebuggerStepThrough()> _ Public Sub SetPrev(ByVal prev As Node) m_Prev = prev End Sub ' 文字列へ変換 <DebuggerStepThrough()> _ Public Overrides Function ToString() As String Return m_Value.ToString() End Function End Class '------------------------------------------------------------------------------------- ' 名前 : ListTraverseDirection ' 概要 : トラバース方向 '------------------------------------------------------------------------------------- Public Enum ListTraverseDirection HeadToTail ' 先頭から末尾へ TailToHead ' 末尾から先頭へ End Enum '------------------------------------------------------------------------------------- ' 名前 : BidirectionalList ' 概要 : 双方向リスト本体 '------------------------------------------------------------------------------------- Public Class BidirectionalList ' 実装するインターフェイス Implements IEnumerable ' フィールド Private m_Count As Integer Private m_Head As Node Private m_Tail As Node Private m_TraverseDirection As ListTraverseDirection ' 先頭ノード Public ReadOnly Property Head() As Node Get Return m_Head End Get End Property ' 末尾ノード Public ReadOnly Property Tail() As Node Get Return m_Tail End Get End Property ' アイテム数 Public ReadOnly Property Count() As Integer Get Return m_Count End Get End Property ' トラバース方向 Public Property TraverseDirection() As ListTraverseDirection Get Return m_TraverseDirection End Get Set(ByVal Value As ListTraverseDirection) m_TraverseDirection = Value End Set End Property '------------------------------------------------------------------------------------- ' 名前 : Values ' 概要 : 全てのノードから該当するインデックスのノードの値を取得・設定する ' デフォルトプロパティ（インデクサとして機能） '------------------------------------------------------------------------------------- Default Public Property Values(ByVal index As Integer) As Integer Get Dim node As Node = Me.Nodes(index) If Not node Is Nothing Then Return node.Value Else Return 0 End If End Get Set(ByVal Value As Integer) Dim node As Node = Me.Nodes(index) If Not node Is Nothing Then node.Value = Value End Set End Property '------------------------------------------------------------------------------------- ' 名前 : Nodes ' 概要 : 全てのノードから該当するインデックスのノードを取得する '------------------------------------------------------------------------------------- Public ReadOnly Property Nodes(ByVal index As Integer) As Node Get Dim node As Node For Each node In Me If index = 0 Then Return node index -= 1 Next Return Nothing End Get End Property '------------------------------------------------------------------------------------- ' 名前 : BidirectionalListEnumerator ' 概要 : BidirectionalList専用列挙子 '------------------------------------------------------------------------------------- <DebuggerStepThrough()> _ Private Class BidirectionalListEnumerator Implements IEnumerator Private m_Head As Node Private m_Tail As Node Private m_Current As Node Private m_TraverseDirection As ListTraverseDirection Public Sub New(ByVal list As BidirectionalList, ByVal direction As ListTraverseDirection) m_Tail = list.Tail m_Head = list.Head m_TraverseDirection = direction Me.Reset() End Sub Public ReadOnly Property Current() As Object Implements IEnumerator.Current Get Return m_Current End Get End Property Public Function MoveNext() As Boolean Implements IEnumerator.MoveNext If m_TraverseDirection = ListTraverseDirection.HeadToTail Then ' 先頭から末尾へのトラバース m_Current = m_Current.Next Return (Not m_Current Is m_Tail) Else ' 末尾から先頭へのトラバース m_Current = m_Current.Prev Return (Not m_Current Is m_Head) End If End Function Public Sub Reset() Implements IEnumerator.Reset If m_TraverseDirection = ListTraverseDirection.HeadToTail Then ' 先頭から末尾へのトラバース m_Current = m_Head Else ' 末尾から先頭へのトラバース m_Current = m_Tail End If End Sub End Class '------------------------------------------------------------------------------------- ' 名前 : New ' 概要 : コンストラクタ '------------------------------------------------------------------------------------- <DebuggerStepThrough()> _ Public Sub New() m_TraverseDirection = ListTraverseDirection.HeadToTail m_Head = New Node(0) m_Tail = New Node(0) m_Head.Next = m_Tail m_Tail.Prev = m_Head m_Count = 0 End Sub '------------------------------------------------------------------------------------- ' 名前 : AddHead ' 概要 : アイテムを先頭に追加 '------------------------------------------------------------------------------------- Public Sub AddHead(ByVal value As Integer) Dim node As New Node(value) node.Next = m_Head.Next m_Head.Next = node m_Count += 1 End Sub '------------------------------------------------------------------------------------- ' 名前 : AddTail ' 概要 : アイテムを末尾に追加 '------------------------------------------------------------------------------------- Public Sub AddTail(ByVal value As Integer) Dim node As New Node(value) node.Prev = m_Tail.Prev m_Tail.Prev = node m_Count += 1 End Sub '------------------------------------------------------------------------------------- ' 名前 : Insert ' 概要 : アイテムの挿入 '------------------------------------------------------------------------------------- Public Sub Insert(ByVal index As Integer, ByVal value As Integer) Dim node As Node = Me.Nodes(index) If Not node Is Nothing Then Dim nodeNew As New Node(value) nodeNew.Prev = node.Prev nodeNew.Next = node node.Prev = nodeNew m_Count += 1 End If End Sub '------------------------------------------------------------------------------------- ' 名前 : Remove ' 概要 : アイテムの削除 '------------------------------------------------------------------------------------- Public Sub Remove(ByVal value As Integer) Dim node As Node For Each node In Me If node.Value = value Then ' リスト構造のつなぎ換え Dim n As Node = node.Next Dim p As Node = node.Prev If Not n Is Nothing Then n.SetPrev(p) If Not p Is Nothing Then p.SetNext(n) ' リストから分離 node.SetNext(Nothing) node.SetPrev(Nothing) m_Count -= 1 Exit For End If Next End Sub '------------------------------------------------------------------------------------- ' 名前 : Clear ' 概要 : アイテムのクリア '------------------------------------------------------------------------------------- Public Sub Clear() m_Head.Next = m_Tail m_Tail.Prev = m_Head m_Count = 0 End Sub '------------------------------------------------------------------------------------- ' 名前 : GetEnumerator ' 概要 : 列挙子を取得 '------------------------------------------------------------------------------------- Public Function GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator ' トラバース方向を指定して列挙子を作成 Return New BidirectionalListEnumerator(Me, m_TraverseDirection) End Function End Class |
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'------------------------------------------------------------------------------------- ' 名前 : Main ' 概要 : アプリケーションのエントリーポイントを提供するクラス '------------------------------------------------------------------------------------- Public Class Main Public Shared Function Main(ByVal args() As String) As Integer ' 双方向リストを作成 Dim list As New BidirectionalList() ' アイテムを追加 Dim i As Integer ' 先頭から追加 For i = 4 To 0 Step -1 list.AddHead(i) Next ' 末尾から追加 For i = 5 To 9 list.AddTail(i) Next ' リスト内を列挙 EnumerateListNode(list) ' 数個のアイテムを削除 Console.WriteLine("Remove items") list.Remove(1) list.Remove(4) list.Remove(6) list.Remove(8) list.Remove(9) ' リスト内を列挙 EnumerateListNode(list) ' 任意の位置に数個のアイテムを挿入 Console.WriteLine("Insert items") list.Insert(3, 0) list.Insert(5, 0) ' リスト内を列挙 EnumerateListNode(list) ' アイテム数を表示 Console.WriteLine("Number of items: " + list.Count.ToString()) ' インデクサによる変更 For i = 0 To list.Count - 1 list(i) = list.Count - i Next ' リスト内を列挙 EnumerateListNode(list) Console.Write(Console.Out.NewLine) ' トラバース方向を順方向に list.TraverseDirection = ListTraverseDirection.HeadToTail Console.WriteLine("Traverse direction: " + list.TraverseDirection.ToString()) EnumerateListNode(list) ' トラバース方向を逆方向に list.TraverseDirection = ListTraverseDirection.TailToHead Console.WriteLine("Traverse direction: " + list.TraverseDirection.ToString()) EnumerateListNode(list) Return 0 End Function '------------------------------------------------------------------------------------- ' 名前 : EnumerateListNode ' 概要 : リストの全ノードを列挙する '------------------------------------------------------------------------------------- Public Shared Sub EnumerateListNode(ByVal list As BidirectionalList) Dim node As Node For Each node In list Console.Write("{0} ", node.Value()) Next Console.Write(Console.Out.NewLine) End Sub End Class |
| 実行結果 | |
0 1 2 3 4 5 6 7 8 9 Remove items 0 2 3 5 7 Insert items 0 2 3 0 5 0 7 Number of items: 7 7 6 5 4 3 2 1 Traverse direction: HeadToTail 7 6 5 4 3 2 1 Traverse direction: TailToHead 1 2 3 4 5 6 7 Press any key to continue | |