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phase_field_element_filter.hh
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			#include "group_manager.hh"
			#include "phase_field_model.hh"

			/* -------------------------------------------------------------------------- */
			namespace akantu {

			class PhaseFieldElementFilter : public GroupManager::ClusteringFilter {
			public:
			PhaseFieldElementFilter(const PhaseFieldModel & model,
			const Real max_damage = 1.)
			: model(model), is_unbroken(max_damage) {}

			bool operator()(const Element & el) const override {

			const Array<Idx> & mat_indexes =
			model.getPhaseFieldByElement(el.type, el.ghost_type);
			const Array<Idx> & mat_loc_num =
			model.getPhaseFieldLocalNumbering(el.type, el.ghost_type);

			const auto & mat = model.getPhaseField(mat_indexes(el.element));

			Idx el_index = mat_loc_num(el.element);
			Int nb_quad_per_element =
			model.getFEEngine("PhaseFieldFEEngine")
			.getNbIntegrationPoints(el.type, el.ghost_type);

			const Array<Real> & damage_array = mat.getDamage(el.type, el.ghost_type);

			AKANTU_DEBUG_ASSERT(nb_quad_per_element * el_index < damage_array.size(),
			"This quadrature point is out of range");

			const Real * element_damage =
			damage_array.data() + nb_quad_per_element * el_index;

			UInt unbroken_quads = std::count_if(
			element_damage, element_damage + nb_quad_per_element, is_unbroken);

			return (unbroken_quads > 0);
			}

			private:
			struct IsUnbrokenFunctor {
			IsUnbrokenFunctor(const Real & max_damage) : max_damage(max_damage) {}
			bool operator()(const Real & x) const { return x > max_damage; }
			const Real max_damage;
			};

			const PhaseFieldModel & model;
			const IsUnbrokenFunctor is_unbroken;
			};

			}