Hi All,
I have an overloaded generic method anmed "Foo":
Class Test
Class Xox(Of T)
End Class
Class Lulli(Of T)
Inherits Xox(Of T)
End Class
Overloads Shared Function Foo(Of T, Iter As Xox(Of T))(ByVal x As
Iter, ByVal tt As T) As Iter
Return x
End Function
Overloads Shared Function Foo(Of T)(ByVal l As Lulli(Of T), ByVal
tt As T) As Lulli(Of T)
Return l
End Function
Shared Sub Main()
Dim xox As New Xox(Of Integer)
Dim lulli As New Lulli(Of Integer)
Dim xx As Xox(Of Integer) = Foo(xox, 42)
' gives a BC30521 error
'Dim ll As Lulli(Of Integer) = Foo(lulli, 42)
End Sub
End Class
When I try to access the second overload, the compiler does not seem to
be able to find the correct method (BC30521). Explicitly declaring the
generic parameters solves the problem:
Dim ll As Lulli(Of Integer) = _
Foo(Of Integer, Lulli(Of Integer))(lulli , 42)
It look like the compiler can't deduct the generic arguments to find the
correct overload.
As this works from C#, I'm asking myself if this "as designed" or a bug
of the VB compiler?
TIA,
Andy
----
To email me directly, please remove the *NO*SPAM* parts below:
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5  2040 
Andreas,
"Andreas Mueller" <me@privacy.net > schrieb: I have an overloaded generic method anmed "Foo":
Class Test
Class Xox(Of T)
End Class
Class Lulli(Of T)
Inherits Xox(Of T)
End Class
Overloads Shared Function Foo(Of T, Iter As Xox(Of T))(ByVal x As
Iter, ByVal tt As T) As Iter
Return x
End Function
Overloads Shared Function Foo(Of T)(ByVal l As Lulli(Of T), ByVal tt
As T) As Lulli(Of T)
Return l
End Function
Shared Sub Main()
Dim xox As New Xox(Of Integer)
Dim lulli As New Lulli(Of Integer)
Dim xx As Xox(Of Integer) = Foo(xox, 42)
' gives a BC30521 error
'Dim ll As Lulli(Of Integer) = Foo(lulli, 42)
End Sub
End Class
When I try to access the second overload, the compiler does not seem to be
able to find the correct method (BC30521). Explicitly declaring the
generic parameters solves the problem:
Dim ll As Lulli(Of Integer) = _
Foo(Of Integer, Lulli(Of Integer))(lulli , 42)
It look like the compiler can't deduct the generic arguments to find the
correct overload.
As this works from C#, I'm asking myself if this "as designed" or a bug of
the VB compiler?
I think this is a bug, because the chapter about overload resolution in the
language specification states that two methods with the same signature
due to type parameters should choose the less generic overload.
I suggest to file a bug report at
<URL:http://lab.msdn.micros oft.com/productfeedback/>. If you do not file
the bug in the next few days I'll submit a bug report on this issue.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
Herfried K. Wagner [MVP] wrote: Andreas,
"Andreas Mueller" <me@privacy.net > schrieb:
I have an overloaded generic method anmed "Foo":
Class Test
Class Xox(Of T)
End Class
Class Lulli(Of T)
Inherits Xox(Of T)
End Class
Overloads Shared Function Foo(Of T, Iter As Xox(Of T))(ByVal x As
Iter, ByVal tt As T) As Iter
Return x
End Function
Overloads Shared Function Foo(Of T)(ByVal l As Lulli(Of T), ByVal
tt As T) As Lulli(Of T)
Return l
End Function
Shared Sub Main()
Dim xox As New Xox(Of Integer)
Dim lulli As New Lulli(Of Integer)
Dim xx As Xox(Of Integer) = Foo(xox, 42)
' gives a BC30521 error
'Dim ll As Lulli(Of Integer) = Foo(lulli, 42)
End Sub
End Class
When I try to access the second overload, the compiler does not seem
to be able to find the correct method (BC30521). Explicitly declaring
the generic parameters solves the problem:
Dim ll As Lulli(Of Integer) = _
Foo(Of Integer, Lulli(Of Integer))(lulli , 42)
It look like the compiler can't deduct the generic arguments to find
the correct overload.
As this works from C#, I'm asking myself if this "as designed" or a
bug of the VB compiler?
I think this is a bug, because the chapter about overload resolution in
the language specification states that two methods with the same signature
due to type parameters should choose the less generic overload.
I suggest to file a bug report at
<URL:http://lab.msdn.micros oft.com/productfeedback/>. If you do not
file the bug in the next few days I'll submit a bug report on this issue.
That's what I thought.
Logged it, DID FDBK42807
CU, Andy
--
To email me directly, please remove the *NO*SPAM* parts below:
*NO*SPAM*xmen40 @*NO*SPAM*gmx.n et
"Andreas Mueller" <me@privacy.net > schrieb: Logged it, DID FDBK42807
It seems that you have forgotten to upload the attachment.
<URL:http://lab.msdn.micros oft.com/productfeedback/viewfeedback.as px?feedbackid=0 7751a75-a700-45b1-af3b-8751afcc7779>
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
Herfried K. Wagner [MVP] wrote: "Andreas Mueller" <me@privacy.net > schrieb:
Logged it, DID FDBK42807
It seems that you have forgotten to upload the attachment.
<URL:http://lab.msdn.micros oft.com/productfeedback/viewfeedback.as px?feedbackid=0 7751a75-a700-45b1-af3b-8751afcc7779>
ok, should be in now. looks like I just browsed for it and didn't hit
the attach button :-(
--
To email me directly, please remove the *NO*SPAM* parts below:
*NO*SPAM*xmen40 @*NO*SPAM*gmx.n et
Andreas,
"Andreas Mueller" <me@privacy.net > schrieb: Logged it, DID FDBK42807
It seems that you have forgotten to upload the attachment.
<URL:http://lab.msdn.micros oft.com/productfeedback/viewfeedback.as px?feedbackid=0 7751a75-a700-45b1-af3b-8751afcc7779>
ok, should be in now. looks like I just browsed for it and didn't hit the
attach button :-(
Thanks very much. I have validated the bug and voted for it.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/> This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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