#include <ElementIntegrator.hpp>
Gaussian integrator on the square [-1, 1] x [-1, 1] with N nodes. SquareIntegrator<2, 4> is used as element integrator in fem_2d_square_types. SquareIntegrator is currently only implemented for N_NODES = 4. You will rarely use this class directly, but might plug it into your own FE traits class as integrator_t or boundary_integrator_t.