QVM: Quaternions, Vectors, Matrices

mat_index_read

#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_read( A const & a, int r, int c );
    }
}

Returns:

The element of a at row r and column c.

Preconditions:

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

Note:

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

See also: boost/qvm/mat_index.hpp