Declaration of template <class __declspec(dllexport) windowclass> giving an error in vs2015

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C++14

VS2015

VC++

We are migrating our projects from vs2005 to VS2015 .In one of the project we are using below template declaration

template <class __declspec(dllexport) WindowClass>

In 2005,it is building successfully but in vs2015 getting below error.

'WindowClass': illegal type for non-type template parameter 'WindowClass'

I am not sure about the use of dllexport inside a template . Anyone know why it is useful and why it is not working in vs2015?

What I have tried:

When I search with the above error, I see that in that latest c++ version we cannot declare a template with a structure or union argument . Apart from this I dont find any information related to that dll export with a template