So far, I did not find for C++, too.
However, you still can use C# solution (Open Source QRCode Library
], E$w@e found it, too), because there is a nice way to export methods from .NET Assembly to unmanaged (without using COM!), and then you would use the resulting library in C++. Many think it's not possible, but this is not true.
Please see my other Answer: loading C# DLL in MFC
I'll understand if you cannot accept this answer. In this case, keep searching, Google is your friend.