Unexpected error C2751 reported at 'using namespace' directive inside a lambda expression.

Unexpected error C2751 reported at 'using namespace' directive inside a lambda expression. by Viorel_

Closed

as Fixed

Type:	Bug
ID:	636634
Opened:	1/18/2011 6:30:40 AM
Access Restriction:	Public

Workaround(s)

view

User(s) can reproduce this bug

In shown situation, the 'using namespace' directive generates an error that seems to be unexpected:

namespace NamespaceA
{
    namespace NamespaceB
    {
    }
}

auto a = []() { using namespace NamespaceA::NamespaceB; };

The error is reported at 'using namespace' line:

error C2751: 'NamespaceA::NamespaceB' : the name of a function parameter cannot be qualified.

No error occurs if the 'a' variable is moved to a function.

Details (expand)

Visual Studio 2010

Reliability

Create a new C++ project, 'Win32 Console Application', with default settings. Append these lines to CPP file:

namespace NamespaceA
{
    namespace NamespaceB
    {
    }
}

auto a = []() { using namespace NamespaceA::NamespaceB; };

Then build the application.

English

Windows 7

English

Compiler reports an error at 'using namespace NamespaceA::NamespaceB' line:

error C2751: 'NamespaceA::NamespaceB' : the name of a function parameter cannot be qualified.

No errors.

0 attachments

Posted by Microsoft on 2/24/2011 at 12:46 PM

Hi:
Thanks for reporting the issue.
A fix for this issue has been checked into the compiler sources. The fix should show up in the next release of Visual C++.

Xiang Fan
Visual C++ Team

Posted by Microsoft on 1/18/2011 at 8:23 PM

Thanks for your feedback. We are routing this issue to the appropriate group within the Visual Studio Product Team for triage and resolution. These specialized experts will follow-up with your issue.

Posted by Microsoft on 1/18/2011 at 6:58 AM

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)