entity.h

#ifndef __37e385afbd3b4b1dba8611fb71787822
#define __37e385afbd3b4b1dba8611fb71787822
 
#include <lf/base/base.h>
#include <lf/geometry/geometry.h>
 
namespace lf::mesh {
 
enum class Orientation : int { positive = 1, negative = -1 };
 
int to_sign(Orientation o);
char to_char(Orientation o);
 
class Entity {
 protected:
  Entity() = default;
  Entity(const Entity&) = default;
  Entity(Entity&&) = default;
  Entity& operator=(const Entity&) = default;
  Entity& operator=(Entity&&) = default;
 
 public:
  [[nodiscard]] virtual unsigned Codim() const = 0;
 
  [[nodiscard]] virtual nonstd::span<const Entity* const> SubEntities(
      unsigned rel_codim) const = 0;
 
  [[nodiscard]] virtual nonstd::span<const Orientation> RelativeOrientations()
      const = 0;
 
  [[nodiscard]] virtual const geometry::Geometry* Geometry() const = 0;
 
  [[nodiscard]] virtual base::RefEl RefEl() const = 0;
 
  [[nodiscard]] virtual bool operator==(const Entity& rhs) const = 0;
 
  [[nodiscard]] bool operator!=(const Entity& rhs) const {
    return !operator==(rhs);
  }
 
  virtual ~Entity() = default;
 
};  // class entity
 
std::ostream& operator<<(std::ostream& stream, const lf::mesh::Entity& entity);
 
}  // namespace lf::mesh
 
#endif  // __37e385afbd3b4b1dba8611fb71787822