boost::fusion::vector with optional std::array not returning valid values

Hi Guys,
Please refer to teh below link which has the detailed problem statement that i am facing.

https://stackoverflow.com/questions/...-with-stdarray

Thanks,
Kartikey

You have declared a boost::fusion::vector with 7 components. You access them as at_c<1> to at_c<7> but shouldn't that rather be at_c<0> to at_c<6>? C++ index ranges usually start at 0.