Boost QVM

make(m)

namespace boost
{
    namespace qvm
    {
        //Only enabled if:
        //  is_m<R>::value && is_m<A>::value &&
        //  m_traits<R>::rows==m_traits<A>::rows &&
        //  m_traits<R>::cols==m_traits<A>::cols
        template <class R,class A>
        R make( A const & a );
    }
}

Requirements:

R must be copyable.

Effects:

As if: R r; assign(r,a); return r;