[boost] [qvn] Why doesn't QVM use [] or () to access vector and matrix elements?

Hi, These operators could be used for views So instead of (m, http://zajo.github.io/boost-qvm/operator_mod_rationale.htmlA42) *= 42; we could have in C++11 ref(m)(4,2) *= 42; ref(m)[4][2) *= 42; In C++98 these could be less efficient than e.g. value<4,2>(m) *= 42; Best, Vicente