Instead, flat std::vector or std::array structures will be used to store data, and
std::experimental::mdspan will be used to handle multidimensional data (https://en.cppreference.com/w/cpp/container/mdspan).
The Python-interface should not be affected by this PR.
Remove xtensor as md array dependency in C++ layer (following https://github.com/FEniCS/dolfinx/pull/2356)
Instead, flat
std::vector
orstd::array
structures will be used to store data, andstd::experimental::mdspan
will be used to handle multidimensional data (https://en.cppreference.com/w/cpp/container/mdspan).The Python-interface should not be affected by this PR.