#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 ); } }
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>::read_element_idx is not available.