通用类（T） - 从类型的范围VB.Net指定 [英] Generic Classes (T) - Specifying from a Range of Types VB.Net

问题描述

这是在code我试图开发：

 公共结构统计（的T）
        昏暗maxStat为T
        昏暗curStat为T

        公共子新（BYVAL P值作为T）
            maxStat = P值
            curStat = P值
        结束小组

        公共属性Level（）为t
            得到
                返回curStat
            最终获取
            设置（BYVAL值作为T）
                curStat =价值
                如果curStat＆GT; maxStat然后curStat = maxStat
            结束设定
        高端物业
    末端结构
 

这不能编译，因为我得到了'>'没有被定义为类型T和T的错误反正我有可以指定机制保障T是一个数值类型的限制？

这是我目前已经从用户的更改和建议后。它仍然没有工作。我一定要改变T的值，所有的人都为IComparable的？必须有很简单的东西是我搞砸了。

 公共结构统计（对T作为IComparable的（对T））
        昏暗maxStat为T
        昏暗curStat为T

        公共子新（BYVAL P值作为T）
            maxStat = P值
            curStat = P值
        结束小组

        公共属性统计（）为t
            得到
                返回curStat
            最终获取
            设置（BYVAL值作为T）
                如果值GT; maxStat然后

                结束如果
            结束设定
        高端物业
    末端结构
 

解决方案

在这里，你去...这应该工作。

 公共结构统计（T为{} IComparable的）
   昏暗maxStat为T
   昏暗curStat为T

   公共子新（BYVAL P值作为T）
      maxStat = P值
      curStat = P值
   结束小组

   公共属性Level（）为t
      得到
            返回curStat
      最终获取
      设置（BYVAL值作为T）
            curStat =价值
            如果curStat.CompareTo（maxStat）＆GT; 0然后curStat = maxStat
      结束设定
   高端物业
末端结构
 

另外，你提到的限制，以数字，但我不认为你可以约束到这一点。但是，您可以限制到只基本类型（在栈上），而不是让任何物体（堆）通过执行此操作：公共结构统计（T为{结构，IComparable的}）。

This is the code I'm trying to develop:

  Public Structure Statistic(Of t)
        Dim maxStat As t
        Dim curStat As t

        Public Sub New(ByVal pValue As t)
            maxStat = pValue
            curStat = pValue
        End Sub

        Public Property Level() As t
            Get
                Return curStat
            End Get
            Set(ByVal value As t)
                curStat = value
                If curStat > maxStat Then curStat = maxStat
            End Set
        End Property
    End Structure

It won't compile because I'm getting an error that '>' is not defined for types of T and T. Is there anyway I can specify constraints that guarentee that T is of a numeric type?

This is what I currently have after changes and suggestions from the users. It's still not working. Do I have to change the values of T for all of them to be IComparable? There must be something really simple that I'm screwing up.

   Public Structure Statistic(Of T As IComparable(Of T))
        Dim maxStat As T
        Dim curStat As T

        Public Sub New(ByVal pValue As T)
            maxStat = pValue
            curStat = pValue
        End Sub

        Public Property Statistic() As T
            Get
                Return curStat
            End Get
            Set(ByVal value As T)
                If value > maxStat Then

                End If
            End Set
        End Property
    End Structure

解决方案

Here you go... this should work.

Public Structure Statistic(Of t As {IComparable})
   Dim maxStat As t
   Dim curStat As t

   Public Sub New(ByVal pValue As t)
      maxStat = pValue
      curStat = pValue
   End Sub

   Public Property Level() As t
      Get
            Return curStat
      End Get
      Set(ByVal value As t)
            curStat = value
            If curStat.CompareTo(maxStat) > 0 Then curStat = maxStat
      End Set
   End Property
End Structure

Also, you mentioned constraining to numerics, but I don't think you can constrain to just that. You can however constrain to just primitive types (on the stack) and not allow objects (on the heap) by doing this: Public Structure Statistic(Of t As {Structure, IComparable}).

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