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QVM: Quaternions, Vectors, Matrices


#include <boost/qvm/vec_index.hpp>

namespace boost
    namespace qvm
        //Only enabled if:
        //  is_vec<A>::value
        template <class A>
        typename vec_traits<A>::scalar_type &
        vec_index_write( A & a, int i );


A mutable reference to the i-th element of a.


i >= 0 && i < vec_traits<A>::dim.


This function uses template metaprogramming and can be used even if the optional access function vec_traits<A>::write_element_idx is not available.