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QVM: Quaternions, Vectors, Matrices


#include <boost/qvm/mat_index.hpp>

namespace boost
    namespace qvm
        //Only enabled if:
        //  is_mat<A>::value
        template <class A>
        typename mat_traits<A>::scalar_type &
        mat_index_write( A & a, int r, int c );


A mutable reference to the element of a at row r and column c.


r >= 0 && r < mat_traits<A>::rows && c >= 0 && c < mat_traits<A>::cols.


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