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Bug in lambda expressions by Андрей Алифанов

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Type: Bug
ID: 694857
Opened: 10/13/2011 8:47:33 PM
Access Restriction: Public
Moderator Decision: Sent to Engineering Team for consideration
0
Workaround(s)
1
User(s) can reproduce this bug
Why compiler cant't compile this code?

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

struct X
{
    typedef int type;
};

int main()
{
    f<X>();
}

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
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
Details (expand)

Visual Studio/Team Foundation Server/.NET Framework Tooling version

Visual Studio 2010 SP1

Steps to reproduce

1. Create file test.cpp
2. Copy first piece of code from description
3. Try to compile it - we get errors

4. Replace lambda with second one
5. Try to compile it - it's ok

Product Language

English

Operating System

Windows 7

Operating System Language

Russian

Actual results

Errors of compiler

Expected results

Normal code compiling
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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 MS-Moderator09 [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)
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