Bug in lambda expressions - by Andrey Alifanov

Status : 

  Fixed<br /><br />
		This item has been fixed in the current or upcoming version of this product.<br /><br />
		A more detailed explanation for the resolution of this particular item may have been provided in the comments section.

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ID 694857 Comments
Status Closed Workarounds
Type Bug Repros 1
Opened 10/13/2011 8:47:33 PM
Access Restriction Public


Why compiler cant't compile this code?

template <class T>
void f()
    ([&]() { typename T::type x; })();

struct X
    typedef int type;

int main()

When I try to compile it, I get the next diagnostic:

Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

test.cpp(4) : error C2899: typename cannot be used outside a template declaration
test.cpp(4) : error C2653: 'T' : is not a class or namespace name
test.cpp(4) : error C2065: 'type' : undeclared identifier
test.cpp(4) : error C2146: syntax error : missing ';' before identifier 'x'
test.cpp(4) : error C2065: 'x' : undeclared identifier

This code is correct as I know and Intel C++ 12.1 proves it.

But VC++ 10.0 SP1 compiles this code:

template <class T>
    void f()
    ([&]() { typedef T TT; TT::type x; })();

I think this is not correct because of typename keyword lack before TT::type
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Posted by Microsoft on 11/3/2011 at 9:27 AM
Hi: this issue has been fixed. The fix should show up in a future release of Visual C++.

Thank you for reporting the issue.

Jonathan Caves
Visual C++ Compiler Team
Posted by EricLeong [Feedback Moderator] on 10/14/2011 at 2:44 AM
Thank you for submitting feedback on Visual Studio 2010 and .NET Framework. Your issue has been routed to the appropriate VS development team for review. We will contact you if we require any additional information.
Posted by MS-Moderator01 on 10/13/2011 at 9:45 PM
Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)