115 lines
3.9 KiB
VB.net
115 lines
3.9 KiB
VB.net
#Region "Microsoft.VisualBasic::00ff821a099908e75295b177c069fae6, Microsoft.VisualBasic.Core\ComponentModel\ValuePair\Binding.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Structure Binding
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'
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' Properties: IsEmpty
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'
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' Constructor: (+1 Overloads) Sub New
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' Function: ToString, Tuple, ValueTuple
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Imports Microsoft.VisualBasic.Language.Default
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Namespace ComponentModel
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''' <summary>
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''' Functioning the same as the <see cref="KeyValuePair(Of T, K)"/>, but with more specific on the name.
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''' <see cref="KeyValuePair(Of T, K)"/> its name is too generic.
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''' (作用与<see cref="KeyValuePair(Of T, K)"/>类似，只不过类型的名称更加符合绑定的描述)
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''' </summary>
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''' <typeparam name="T"></typeparam>
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''' <typeparam name="K"></typeparam>
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Public Structure Binding(Of T, K)
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Implements IsEmpty
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Dim Bind As T
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Dim Target As K
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''' <summary>
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''' If the field <see cref="Bind"/> and <see cref="Target"/> are both nothing, then this binding is empty.
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''' (当<see cref="Bind"/>以及<see cref="Target"/>都同时为空值的时候这个参数才会为真)
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''' </summary>
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''' <returns></returns>
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Public ReadOnly Property IsEmpty As Boolean Implements IsEmpty.IsEmpty
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return Bind Is Nothing AndAlso Target Is Nothing
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End Get
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End Property
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Sub New(source As T, target As K)
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Me.Bind = source
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Me.Target = target
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End Sub
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Public Overrides Function ToString() As String
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If IsEmpty Then
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Return "No binding"
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Else
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Return Bind.ToString & " --> " & Target.ToString
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End If
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End Function
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''' <summary>
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''' Convert this binding to tuple
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''' </summary>
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''' <returns></returns>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Function Tuple() As Tuple(Of T, K)
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Return Me
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Function ValueTuple() As (bind As T, target As K)
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Return (Bind, Target)
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End Function
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''' <summary>
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''' Implicit convert this binding as the <see cref="System.Tuple(Of T, K)"/>
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''' </summary>
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''' <param name="b"></param>
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''' <returns></returns>
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'''
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Narrowing Operator CType(b As Binding(Of T, K)) As Tuple(Of T, K)
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Return New Tuple(Of T, K)(b.Bind, b.Target)
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End Operator
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End Structure
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End Namespace
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