LIBFLATARRAY_REGISTER_SOA does not work with class templates having more than one template parameter

[gentryx]

Hi,

i tried to use LibFlatArray with a class template which has more than one template parameter and it didn't compile. A simple example can be found here: https://gist.github.com/anonymous/b188cd1459c1b6d5ca6f

The error message is: error: macro "LIBFLATARRAY_REGISTER_SOA" passed 3 arguments, but takes just 2 LIBFLATARRAY_REGISTER_SOA(Cell<4, 1>, ((double)(sum))((double)(value)))

Since it works fine with just one template parameter, the issue might be related to the comma inside Cell<4, 1>.

Originally reported by @shifty91

Moved from https://bitbucket.org/gentryx/libflatarray/issues/16/libflatarray_register_soa-does-not-work

[gentryx]

This issue could potentially be resolved by wrapping the class name in parentheses. But that would still require the user to explicitly list all template instantiations, which is tedious and cumbersome. I'd prefer a solution which leaves the template parameters open (after all, all the macro does is to define some further templates, adding more parameters should work). I'll look into this.