source: branch/egtra-gdiplus/Classes/System/Runtime/InteropServices/GCHandle.ab@ 569

' Classes/System/Runtime/InteropServices/GCHandle.ab

#require <Classes/System/Collections/ArrayList.ab>

Class GCHandle
Public
    Function Target() As Object
        Dim pobj = VarPtr(handle) As *Object
        Return pobj[0]
    End Function

    Sub Target(obj As Object)
        allocated.Add(obj)
        handle = VarPtr(obj) 'ObjPtr
    End Sub

    Const Function IsAllocated() As Boolean
        Return handle <> 0
    End Function

    Static Function Alloc(obj As Object) As GCHandle
        Alloc = New GCHandle
        Alloc.Target = obj
    End Function

    Sub Free()
        allocated.Remove(Target)
        handle = 0
    End Sub

    Static Function ToIntPtr(h As GCHandle) As LONG_PTR
        Return h.handle As LONG_PTR
    End Function

    Static Function FromIntPtr(ip As LONG_PTR) As GCHandle
        FromIntPtr = New GCHandle
        FromIntPtr.handle = ip As VoidPtr
    End Function

    Override Function GetHashCode() As Long
        Return _System_HashFromPtr(handle)
    End Function

    Function Equals(y As GCHandle) As Boolean
        Return handle = y.handle
    End Function

    Function Operator == (y As GCHandle) As Boolean
        Return Equals(y)
    End Function

    Function Operator <> (y As GCHandle) As Boolean
        Return Not Equals(y)
    End Function

    Override Function ToString() As String
        Return "System.Runtime.InteropServices.GCHandle"
    End Function

'Private
    Sub GCHandle()
    End Sub

Private
    handle As VoidPtr

    Static allocated As ArrayList
End Class