Apply override to Fix classes

src/ASPHERE/fix_nh_asphere.h

@@ -21,16 +21,15 @@ namespace LAMMPS_NS {
 class FixNHAsphere : public FixNH {
  public:
   FixNHAsphere(class LAMMPS *, int, char **);
-  virtual ~FixNHAsphere() {}
-  void init();
+  void init() override;
 
  protected:
   double dtq;
   class AtomVecEllipsoid *avec;
 
-  void nve_v();
-  void nve_x();
-  void nh_v_temp();
+  void nve_v() override;
+  void nve_x() override;
+  void nh_v_temp() override;
 };
 
 }    // namespace LAMMPS_NS

src/ASPHERE/fix_nph_asphere.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPHAsphere : public FixNHAsphere {
  public:
   FixNPHAsphere(class LAMMPS *, int, char **);
-  ~FixNPHAsphere() {}
 };
 
 }    // namespace LAMMPS_NS

src/ASPHERE/fix_npt_asphere.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPTAsphere : public FixNHAsphere {
  public:
   FixNPTAsphere(class LAMMPS *, int, char **);
-  ~FixNPTAsphere() {}
 };
 
 }    // namespace LAMMPS_NS

src/ASPHERE/fix_nve_asphere.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixNVEAsphere : public FixNVE {
  public:
   FixNVEAsphere(class LAMMPS *, int, char **);
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double dtq;

src/ASPHERE/fix_nve_asphere_noforce.h

@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class FixNVEAsphereNoforce : public FixNVENoforce {
  public:
   FixNVEAsphereNoforce(class LAMMPS *, int, char **);
-  void initial_integrate(int);
-  void init();
+  void initial_integrate(int) override;
+  void init() override;
 
  private:
   double dtq;

src/ASPHERE/fix_nve_line.h

@@ -27,11 +27,10 @@ namespace LAMMPS_NS {
 class FixNVELine : public FixNVE {
  public:
   FixNVELine(class LAMMPS *, int, char **);
-  ~FixNVELine() {}
-  int setmask();
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double MINUSPI, TWOPI;

src/ASPHERE/fix_nve_tri.h

@@ -27,11 +27,10 @@ namespace LAMMPS_NS {
 class FixNVETri : public FixNVE {
  public:
   FixNVETri(class LAMMPS *, int, char **);
-  ~FixNVETri() {}
-  int setmask();
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double dtq;

src/ASPHERE/fix_nvt_asphere.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNVTAsphere : public FixNHAsphere {
  public:
   FixNVTAsphere(class LAMMPS *, int, char **);
-  ~FixNVTAsphere() {}
 };
 
 }    // namespace LAMMPS_NS

src/BOCS/fix_bocs.h

@@ -30,26 +30,26 @@ namespace LAMMPS_NS {
 class FixBocs : public Fix {
  public:
   FixBocs(class LAMMPS *, int, char **);    // MRD NJD
-  virtual ~FixBocs();                       // MRD NJD
-  int setmask();
-  virtual void init();
-  virtual void setup(int);
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  void initial_integrate_respa(int, int, int);
-  void pre_force_respa(int, int, int);
-  void final_integrate_respa(int, int);
-  virtual void pre_exchange();
-  double compute_scalar();
-  virtual double compute_vector(int);
-  void write_restart(FILE *);
+  ~FixBocs() override;                       // MRD NJD
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void pre_force_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void pre_exchange() override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
+  void write_restart(FILE *) override;
   virtual int pack_restart_data(double *);    // pack restart data
-  virtual void restart(char *);
-  int modify_param(int, char **);
-  void reset_target(double);
-  void reset_dt();
-  virtual void *extract(const char *, int &);
-  double memory_usage();
+  void restart(char *) override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  void reset_dt() override;
+  void *extract(const char *, int &) override;
+  double memory_usage() override;
 
  protected:
   int dimension, which;

src/BODY/fix_nh_body.h

@@ -21,16 +21,15 @@ namespace LAMMPS_NS {
 class FixNHBody : public FixNH {
  public:
   FixNHBody(class LAMMPS *, int, char **);
-  virtual ~FixNHBody() {}
-  void init();
+  void init() override;
 
  protected:
   double dtq;
   class AtomVecBody *avec;
 
-  void nve_v();
-  void nve_x();
-  void nh_v_temp();
+  void nve_v() override;
+  void nve_x() override;
+  void nh_v_temp() override;
 };
 
 }    // namespace LAMMPS_NS

src/BODY/fix_nph_body.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPHBody : public FixNHBody {
  public:
   FixNPHBody(class LAMMPS *, int, char **);
-  ~FixNPHBody() {}
 };
 
 }    // namespace LAMMPS_NS

src/BODY/fix_npt_body.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPTBody : public FixNHBody {
  public:
   FixNPTBody(class LAMMPS *, int, char **);
-  ~FixNPTBody() {}
 };
 
 }    // namespace LAMMPS_NS

src/BODY/fix_nve_body.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixNVEBody : public FixNVE {
  public:
   FixNVEBody(class LAMMPS *, int, char **);
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double dtq;

src/BODY/fix_nvt_body.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNVTBody : public FixNHBody {
  public:
   FixNVTBody(class LAMMPS *, int, char **);
-  ~FixNVTBody() {}
 };
 
 }    // namespace LAMMPS_NS

src/BODY/fix_wall_body_polygon.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixWallBodyPolygon : public Fix {
  public:
   FixWallBodyPolygon(class LAMMPS *, int, char **);
-  virtual ~FixWallBodyPolygon();
-  int setmask();
-  void init();
-  void setup(int);
-  virtual void post_force(int);
-  void reset_dt();
+  ~FixWallBodyPolygon() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void reset_dt() override;
 
   struct Contact {
     int ibody, jbody;     // body (i.e. atom) indices (not tags)

src/BODY/fix_wall_body_polyhedron.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixWallBodyPolyhedron : public Fix {
  public:
   FixWallBodyPolyhedron(class LAMMPS *, int, char **);
-  virtual ~FixWallBodyPolyhedron();
-  int setmask();
-  void init();
-  void setup(int);
-  virtual void post_force(int);
-  void reset_dt();
+  ~FixWallBodyPolyhedron() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void reset_dt() override;
 
   struct Contact {
     int ibody, jbody;     // body (i.e. atom) indices (not tags)

src/BROWNIAN/fix_brownian.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixBrownian : public FixBrownianBase {
  public:
   FixBrownian(class LAMMPS *, int, char **);
-  virtual ~FixBrownian(){};
-  void init();
-  void initial_integrate(int);
+
+  void init() override;
+  void initial_integrate(int) override;
 
  private:
   template <int Tp_UNIFORM, int Tp_GAUSS, int Tp_2D> void initial_integrate_templated();

src/BROWNIAN/fix_brownian_asphere.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixBrownianAsphere : public FixBrownianBase {
  public:
   FixBrownianAsphere(class LAMMPS *, int, char **);
-  virtual ~FixBrownianAsphere(){};
-  void initial_integrate(int);
-  void init();
+
+  void initial_integrate(int) override;
+  void init() override;
 
  protected:
   class AtomVecEllipsoid *avec;

src/BROWNIAN/fix_brownian_base.h

@@ -21,10 +21,10 @@ namespace LAMMPS_NS {
 class FixBrownianBase : public Fix {
  public:
   FixBrownianBase(class LAMMPS *, int, char **);
-  virtual ~FixBrownianBase();
-  void init();
-  int setmask();
-  void reset_dt();
+  ~FixBrownianBase() override;
+  void init() override;
+  int setmask() override;
+  void reset_dt() override;
 
  protected:
   int seed;                  // RNG seed

src/BROWNIAN/fix_brownian_sphere.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixBrownianSphere : public FixBrownianBase {
  public:
   FixBrownianSphere(class LAMMPS *, int, char **);
-  virtual ~FixBrownianSphere(){};
-  void init();
-  void initial_integrate(int);
+
+  void init() override;
+  void initial_integrate(int) override;
 
  private:
   template <int Tp_UNIFORM, int Tp_GAUSS, int Tp_2D> void initial_integrate_templated();

src/BROWNIAN/fix_propel_self.h

@@ -26,11 +26,11 @@ namespace LAMMPS_NS {
 class FixPropelSelf : public Fix {
  public:
   FixPropelSelf(class LAMMPS *, int, char **);
-  virtual ~FixPropelSelf(){};
-  void init();
-  void post_force(int);
-  void setup(int);
-  int setmask();
+
+  void init() override;
+  void post_force(int) override;
+  void setup(int) override;
+  int setmask() override;
 
  private:
   double magnitude;

src/CG-DNA/fix_nve_dot.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixNVEDot : public FixNVE {
  public:
   FixNVEDot(class LAMMPS *, int, char **);
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double dt, dthlf, dthlfm;

src/CG-DNA/fix_nve_dotc_langevin.h

@@ -27,10 +27,10 @@ namespace LAMMPS_NS {
 class FixNVEDotcLangevin : public FixNVE {
  public:
   FixNVEDotcLangevin(class LAMMPS *, int, char **);
-  virtual ~FixNVEDotcLangevin();
-  void init();
-  void initial_integrate(int);
-  void final_integrate();
+  ~FixNVEDotcLangevin() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  private:
   double dt, dthlf, dthlfm, dtqrt;

src/COLLOID/fix_wall_colloid.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixWallColloid : public FixWall {
  public:
   FixWallColloid(class LAMMPS *, int, char **);
-  void init();
-  void precompute(int);
-  void wall_particle(int, int, double);
+  void init() override;
+  void precompute(int) override;
+  void wall_particle(int, int, double) override;
 
  private:
   double coeff1[6], coeff2[6], coeff3[6], coeff4[6];

src/DIELECTRIC/fix_polarize_bem_gmres.h

@@ -27,22 +27,22 @@ namespace LAMMPS_NS {
 class FixPolarizeBEMGMRES : public Fix {
  public:
   FixPolarizeBEMGMRES(class LAMMPS *, int, char **);
-  ~FixPolarizeBEMGMRES();
-  virtual int setmask();
-  virtual void init();
-  virtual void setup(int);
-  virtual void pre_force(int);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  virtual double compute_vector(int);
+  ~FixPolarizeBEMGMRES() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void pre_force(int) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  double compute_vector(int) override;
 
-  int modify_param(int, char **);
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  void set_arrays(int);
+  int modify_param(int, char **) override;
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
   virtual void allocate();
   virtual void deallocate();
 

src/DIELECTRIC/fix_polarize_bem_icc.h

@@ -27,15 +27,15 @@ namespace LAMMPS_NS {
 class FixPolarizeBEMICC : public Fix {
  public:
   FixPolarizeBEMICC(class LAMMPS *, int, char **);
-  ~FixPolarizeBEMICC() = default;
-  virtual int setmask();
-  virtual void init();
-  virtual void setup(int);
-  virtual void pre_force(int);
-  virtual double compute_vector(int);
-  int modify_param(int, char **);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
+
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void pre_force(int) override;
+  double compute_vector(int) override;
+  int modify_param(int, char **) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
 
   virtual void compute_induced_charges();
   void set_dielectric_params(double, double, double, double, int, double);

src/DIELECTRIC/fix_polarize_functional.h

@@ -27,25 +27,25 @@ namespace LAMMPS_NS {
 class FixPolarizeFunctional : public Fix {
  public:
   FixPolarizeFunctional(class LAMMPS *, int, char **);
-  ~FixPolarizeFunctional();
-  int setmask();
-  void init();
-  void init_list(int, class NeighList *);
-  void setup(int);
-  void setup_pre_force(int vflag);
-  void pre_force(int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
+  ~FixPolarizeFunctional() override;
+  int setmask() override;
+  void init() override;
+  void init_list(int, class NeighList *) override;
+  void setup(int) override;
+  void setup_pre_force(int vflag) override;
+  void pre_force(int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
 
-  int modify_param(int, char **);
-  double memory_usage();
+  int modify_param(int, char **) override;
+  double memory_usage() override;
   void allocate();
   void deallocate();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  void set_arrays(int);
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
 
  protected:
   int nmax;

src/DIFFRACTION/fix_saed_vtk.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixSAEDVTK : public Fix {
  public:
   FixSAEDVTK(class LAMMPS *, int, char **);
-  ~FixSAEDVTK();
-  int setmask();
-  void init();
-  void setup(int);
-  void end_of_step();
-  double compute_vector(int);
+  ~FixSAEDVTK() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void end_of_step() override;
+  double compute_vector(int) override;
   void reset_timestep(bigint);
 
  private:

src/DPD-MESO/fix_edpd_source.h

@@ -27,10 +27,9 @@ namespace LAMMPS_NS {
 class FixEDPDSource : public Fix {
  public:
   FixEDPDSource(class LAMMPS *, int, char **);
-  ~FixEDPDSource() = default;
-  int setmask();
-  void init();
-  void post_force(int);
+  int setmask() override;
+  void init() override;
+  void post_force(int) override;
 
  protected:
   int option;

src/DPD-MESO/fix_mvv_dpd.h

@@ -27,12 +27,11 @@ namespace LAMMPS_NS {
 class FixMvvDPD : public Fix {
  public:
   FixMvvDPD(class LAMMPS *, int, char **);
-  virtual ~FixMvvDPD() {}
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void reset_dt();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
 
  protected:
   double dtv, dtf;

src/DPD-MESO/fix_mvv_edpd.h

@@ -27,12 +27,11 @@ namespace LAMMPS_NS {
 class FixMvvEDPD : public Fix {
  public:
   FixMvvEDPD(class LAMMPS *, int, char **);
-  virtual ~FixMvvEDPD() {}
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void reset_dt();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
 
  protected:
   double dtv, dtf;

src/DPD-MESO/fix_mvv_tdpd.h

@@ -27,12 +27,11 @@ namespace LAMMPS_NS {
 class FixMvvTDPD : public Fix {
  public:
   FixMvvTDPD(class LAMMPS *, int, char **);
-  virtual ~FixMvvTDPD() {}
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void reset_dt();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
 
  protected:
   double dtv, dtf;

src/DPD-MESO/fix_tdpd_source.h

@@ -27,10 +27,9 @@ namespace LAMMPS_NS {
 class FixTDPDSource : public Fix {
  public:
   FixTDPDSource(class LAMMPS *, int, char **);
-  ~FixTDPDSource() = default;
-  int setmask();
-  void init();
-  void post_force(int);
+  int setmask() override;
+  void init() override;
+  void post_force(int) override;
 
  protected:
   int option;

src/DPD-REACT/fix_dpd_energy.h

@@ -27,10 +27,9 @@ namespace LAMMPS_NS {
 class FixDPDenergy : public Fix {
  public:
   FixDPDenergy(class LAMMPS *, int, char **);
-  virtual ~FixDPDenergy() {}
-  int setmask();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
+  int setmask() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
  protected:
   class PairDPDfdtEnergy *pairDPDE;

src/DPD-REACT/fix_eos_cv.h

@@ -27,11 +27,10 @@ namespace LAMMPS_NS {
 class FixEOScv : public Fix {
  public:
   FixEOScv(class LAMMPS *, int, char **);
-  virtual ~FixEOScv() {}
-  int setmask();
-  virtual void init();
-  virtual void post_integrate();
-  virtual void end_of_step();
+  int setmask() override;
+  void init() override;
+  void post_integrate() override;
+  void end_of_step() override;
 
  protected:
   double cvEOS;

src/DPD-REACT/fix_eos_table.h

@@ -27,11 +27,11 @@ namespace LAMMPS_NS {
 class FixEOStable : public Fix {
  public:
   FixEOStable(class LAMMPS *, int, char **);
-  virtual ~FixEOStable();
-  int setmask();
-  virtual void init();
-  virtual void post_integrate();
-  virtual void end_of_step();
+  ~FixEOStable() override;
+  int setmask() override;
+  void init() override;
+  void post_integrate() override;
+  void end_of_step() override;
   void energy_lookup(double, double &);
   void temperature_lookup(double, double &);
 

src/DPD-REACT/fix_eos_table_rx.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixEOStableRX : public Fix {
  public:
   FixEOStableRX(class LAMMPS *, int, char **);
-  virtual ~FixEOStableRX();
-  int setmask();
-  void setup(int);
-  virtual void init();
-  virtual void post_integrate();
-  virtual void end_of_step();
+  ~FixEOStableRX() override;
+  int setmask() override;
+  void setup(int) override;
+  void init() override;
+  void post_integrate() override;
+  void end_of_step() override;
   void energy_lookup(int, double, double &);
   void temperature_lookup(int, double, double &);
 
@@ -69,10 +69,10 @@ class FixEOStableRX : public Fix {
 
   double *dHf, *energyCorr, *tempCorrCoeff, *moleculeCorrCoeff;
 
-  int pack_reverse_comm(int, int, double *);
-  void unpack_reverse_comm(int, int *, double *);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
+  int pack_reverse_comm(int, int, double *) override;
+  void unpack_reverse_comm(int, int *, double *) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
 
   int *eosSpecies;
   int ncolumn;

src/DPD-REACT/fix_rx.h

@@ -30,19 +30,19 @@ enum { ODE_LAMMPS_RK4, ODE_LAMMPS_RKF45 };
 class FixRX : public Fix {
  public:
   FixRX(class LAMMPS *, int, char **);
-  ~FixRX();
-  int setmask();
-  void post_constructor();
-  virtual void init();
-  void init_list(int, class NeighList *);
-  virtual void setup_pre_force(int);
-  virtual void pre_force(int);
+  ~FixRX() override;
+  int setmask() override;
+  void post_constructor() override;
+  void init() override;
+  void init_list(int, class NeighList *) override;
+  void setup_pre_force(int) override;
+  void pre_force(int) override;
 
  protected:
-  int pack_reverse_comm(int, int, double *);
-  void unpack_reverse_comm(int, int *, double *);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
+  int pack_reverse_comm(int, int, double *) override;
+  void unpack_reverse_comm(int, int *, double *) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
 
   class NeighList *list;
 

src/DPD-REACT/fix_shardlow.h

@@ -30,14 +30,14 @@ class FixShardlow : public Fix {
   class NeighList *list;    // The SSA specific neighbor list
 
   FixShardlow(class LAMMPS *, int, char **);
-  ~FixShardlow();
-  int setmask();
-  virtual void init();
-  virtual void init_list(int, class NeighList *);
-  virtual void setup(int);
-  virtual void initial_integrate(int);
+  ~FixShardlow() override;
+  int setmask() override;
+  void init() override;
+  void init_list(int, class NeighList *) override;
+  void setup(int) override;
+  void initial_integrate(int) override;
 
-  double memory_usage();
+  double memory_usage() override;
 
 #ifdef DEBUG_SSA_PAIR_CT
   int counters[2][3];
@@ -45,10 +45,10 @@ class FixShardlow : public Fix {
 #endif
 
  protected:
-  int pack_reverse_comm(int, int, double *);
-  void unpack_reverse_comm(int, int *, double *);
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
+  int pack_reverse_comm(int, int, double *) override;
+  void unpack_reverse_comm(int, int *, double *) override;
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
 
   class PairDPDfdt *pairDPD;
   class PairDPDfdtEnergy *pairDPDE;

src/DPD-SMOOTH/fix_meso_move.h

@@ -27,27 +27,27 @@ namespace LAMMPS_NS {
 class FixMesoMove : public Fix {
  public:
   FixMesoMove(class LAMMPS *, int, char **);
-  ~FixMesoMove();
-  int setmask();
-  void init();
-  void setup_pre_force(int);
-  void initial_integrate(int);
-  void final_integrate();
+  ~FixMesoMove() override;
+  int setmask() override;
+  void init() override;
+  void setup_pre_force(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
 
-  double memory_usage();
-  void write_restart(FILE *);
-  void restart(char *);
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  void set_arrays(int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int maxsize_restart();
-  int size_restart(int);
+  double memory_usage() override;
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int maxsize_restart() override;
+  int size_restart(int) override;
 
-  void reset_dt();
+  void reset_dt() override;
 
  private:
   char *xvarstr, *yvarstr, *zvarstr, *vxvarstr, *vyvarstr, *vzvarstr;

src/DPD-SMOOTH/fix_rigid_meso.h

@@ -27,13 +27,13 @@ namespace LAMMPS_NS {
 class FixRigidMeso : public FixRigid {
  public:
   FixRigidMeso(class LAMMPS *, int, char **);
-  ~FixRigidMeso();
-  int setmask();
-  void setup(int);
-  void initial_integrate(int);
-  void final_integrate();
-  double compute_scalar() { return 0.0; }
-  double compute_array(int, int);
+  ~FixRigidMeso() override;
+  int setmask() override;
+  void setup(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  double compute_scalar() override { return 0.0; }
+  double compute_array(int, int) override;
 
  protected:
   void set_xv();

src/DRUDE/fix_drude.h

@@ -36,17 +36,17 @@ class FixDrude : public Fix {
   bool is_reduced;
 
   FixDrude(class LAMMPS *, int, char **);
-  virtual ~FixDrude();
-  int setmask();
-  void init();
+  ~FixDrude() override;
+  int setmask() override;
+  void init() override;
 
-  void grow_arrays(int nmax);
-  void copy_arrays(int i, int j, int delflag);
-  void set_arrays(int i);
-  int pack_exchange(int i, double *buf);
-  int unpack_exchange(int nlocal, double *buf);
-  int pack_border(int n, int *list, double *buf);
-  int unpack_border(int n, int first, double *buf);
+  void grow_arrays(int nmax) override;
+  void copy_arrays(int i, int j, int delflag) override;
+  void set_arrays(int i) override;
+  int pack_exchange(int i, double *buf) override;
+  int unpack_exchange(int nlocal, double *buf) override;
+  int pack_border(int n, int *list, double *buf) override;
+  int unpack_border(int n, int first, double *buf) override;
 
  private:
   int rebuildflag;
@@ -55,7 +55,7 @@ class FixDrude : public Fix {
   void build_drudeid();
   static void ring_search_drudeid(int size, char *cbuf, void *ptr);
   static void ring_build_partner(int size, char *cbuf, void *ptr);
-  void rebuild_special();
+  void rebuild_special() override;
   static void ring_remove_drude(int size, char *cbuf, void *ptr);
   static void ring_add_drude(int size, char *cbuf, void *ptr);
   static void ring_copy_drude(int size, char *cbuf, void *ptr);

src/DRUDE/fix_drude_transform.h

@@ -28,16 +28,16 @@ namespace LAMMPS_NS {
 template <bool inverse> class FixDrudeTransform: public Fix {
  public:
   FixDrudeTransform(class LAMMPS *, int, char **);
-  ~FixDrudeTransform();
-  int setmask();
-  void init();
-  void setup(int vflag);
+  ~FixDrudeTransform() override;
+  int setmask() override;
+  void init() override;
+  void setup(int vflag) override;
   void reduced_to_real();
   void real_to_reduced();
-  void initial_integrate(int vflag);
-  void final_integrate();
-  int pack_forward_comm(int n, int *list, double *buf, int pbc_flag, int *pbc);
-  void unpack_forward_comm(int n, int first, double *buf);
+  void initial_integrate(int vflag) override;
+  void final_integrate() override;
+  int pack_forward_comm(int n, int *list, double *buf, int pbc_flag, int *pbc) override;
+  void unpack_forward_comm(int n, int first, double *buf) override;
 
  protected:
   double *mcoeff;

src/DRUDE/fix_langevin_drude.h

@@ -27,16 +27,16 @@ namespace LAMMPS_NS {
 class FixLangevinDrude : public Fix {
  public:
   FixLangevinDrude(class LAMMPS *, int, char **);
-  virtual ~FixLangevinDrude();
-  int setmask();
-  void init();
-  void setup(int vflag);
-  virtual void post_force(int vflag);
-  void reset_target(double);
-  virtual void *extract(const char *, int &);
-  int pack_reverse_comm(int, int, double *);
-  void unpack_reverse_comm(int, int *, double *);
-  int modify_param(int, char **);
+  ~FixLangevinDrude() override;
+  int setmask() override;
+  void init() override;
+  void setup(int vflag) override;
+  void post_force(int vflag) override;
+  void reset_target(double) override;
+  void *extract(const char *, int &) override;
+  int pack_reverse_comm(int, int, double *) override;
+  void unpack_reverse_comm(int, int *, double *) override;
+  int modify_param(int, char **) override;
 
  protected:
   double t_start_core, t_period_core, t_target_core;

src/DRUDE/fix_tgnh_drude.h

@@ -21,25 +21,25 @@ namespace LAMMPS_NS {
 class FixTGNHDrude : public Fix {
  public:
   FixTGNHDrude(class LAMMPS *, int, char **);
-  virtual ~FixTGNHDrude();
-  int setmask();
-  virtual void init();
-  virtual void setup(int);
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  void pre_force_respa(int, int, int);
-  void initial_integrate_respa(int, int, int);
-  void final_integrate_respa(int, int);
-  virtual void pre_exchange();
-  double compute_scalar();
-  virtual double compute_vector(int);
-  void write_restart(FILE *);
+  ~FixTGNHDrude() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void pre_force_respa(int, int, int) override;
+  void initial_integrate_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void pre_exchange() override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
+  void write_restart(FILE *) override;
   virtual int pack_restart_data(double *);    // pack restart data
-  virtual void restart(char *);
-  int modify_param(int, char **);
-  void reset_target(double);
-  void reset_dt();
-  double memory_usage();
+  void restart(char *) override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  void reset_dt() override;
+  double memory_usage() override;
 
  protected:
   int dimension, which;

src/DRUDE/fix_tgnpt_drude.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixTGNPTDrude : public FixTGNHDrude {
  public:
   FixTGNPTDrude(class LAMMPS *, int, char **);
-  ~FixTGNPTDrude() {}
 };
 
 }    // namespace LAMMPS_NS

src/DRUDE/fix_tgnvt_drude.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixTGNVTDrude : public FixTGNHDrude {
  public:
   FixTGNVTDrude(class LAMMPS *, int, char **);
-  ~FixTGNVTDrude() {}
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_langevin_eff.h

@@ -27,10 +27,10 @@ namespace LAMMPS_NS {
 class FixLangevinEff : public FixLangevin {
  public:
   FixLangevinEff(class LAMMPS *, int, char **);
-  ~FixLangevinEff();
-  void end_of_step();
-  double compute_scalar();
-  void post_force(int);
+  ~FixLangevinEff() override;
+  void end_of_step() override;
+  double compute_scalar() override;
+  void post_force(int) override;
 
  private:
   double *erforcelangevin;

src/EFF/fix_nh_eff.h

@@ -21,12 +21,11 @@ namespace LAMMPS_NS {
 class FixNHEff : public FixNH {
  public:
   FixNHEff(class LAMMPS *, int, char **);
-  virtual ~FixNHEff() {}
 
  protected:
-  void nve_v();
-  void nve_x();
-  virtual void nh_v_temp();
+  void nve_v() override;
+  void nve_x() override;
+  void nh_v_temp() override;
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_nph_eff.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPHEff : public FixNHEff {
  public:
   FixNPHEff(class LAMMPS *, int, char **);
-  ~FixNPHEff() {}
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_npt_eff.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNPTEff : public FixNHEff {
  public:
   FixNPTEff(class LAMMPS *, int, char **);
-  ~FixNPTEff() {}
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_nve_eff.h

@@ -27,13 +27,13 @@ namespace LAMMPS_NS {
 class FixNVEEff : public Fix {
  public:
   FixNVEEff(class LAMMPS *, int, char **);
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  void initial_integrate_respa(int, int, int);
-  void final_integrate_respa(int, int);
-  void reset_dt();
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void reset_dt() override;
 
  protected:
   double dtv, dtf;

src/EFF/fix_nvt_eff.h

@@ -27,7 +27,6 @@ namespace LAMMPS_NS {
 class FixNVTEff : public FixNHEff {
  public:
   FixNVTEff(class LAMMPS *, int, char **);
-  ~FixNVTEff() {}
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_nvt_sllod_eff.h

@@ -27,13 +27,12 @@ namespace LAMMPS_NS {
 class FixNVTSllodEff : public FixNHEff {
  public:
   FixNVTSllodEff(class LAMMPS *, int, char **);
-  ~FixNVTSllodEff() {}
-  void init();
+  void init() override;
 
  private:
   int nondeformbias;
 
-  void nh_v_temp();
+  void nh_v_temp() override;
 };
 
 }    // namespace LAMMPS_NS

src/EFF/fix_temp_rescale_eff.h

@@ -27,13 +27,13 @@ namespace LAMMPS_NS {
 class FixTempRescaleEff : public Fix {
  public:
   FixTempRescaleEff(class LAMMPS *, int, char **);
-  virtual ~FixTempRescaleEff();
-  int setmask();
-  void init();
-  virtual void end_of_step();
-  int modify_param(int, char **);
-  void reset_target(double);
-  double compute_scalar();
+  ~FixTempRescaleEff() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  double compute_scalar() override;
 
  protected:
   int which;

src/EXTRA-FIX/fix_addtorque.h

@@ -27,16 +27,16 @@ namespace LAMMPS_NS {
 class FixAddTorque : public Fix {
  public:
   FixAddTorque(class LAMMPS *, int, char **);
-  ~FixAddTorque();
-  int setmask();
-  void init();
-  void setup(int);
-  void min_setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  void min_post_force(int);
-  double compute_scalar();
-  double compute_vector(int);
+  ~FixAddTorque() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  void min_post_force(int) override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
 
  private:
   double xvalue, yvalue, zvalue;

src/EXTRA-FIX/fix_ave_correlate_long.h

@@ -27,15 +27,15 @@ namespace LAMMPS_NS {
 class FixAveCorrelateLong : public Fix {
  public:
   FixAveCorrelateLong(class LAMMPS *, int, char **);
-  ~FixAveCorrelateLong();
-  int setmask();
-  void init();
-  void setup(int);
-  void end_of_step();
+  ~FixAveCorrelateLong() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void end_of_step() override;
 
-  void write_restart(FILE *);
-  void restart(char *);
-  double memory_usage();
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  double memory_usage() override;
 
   double *t;     // Time steps for result arrays
   double **f;    // Result arrays

src/EXTRA-FIX/fix_controller.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixController : public Fix {
  public:
   FixController(class LAMMPS *, int, char **);
-  ~FixController();
-  int setmask();
-  void init();
-  void end_of_step();
-  void reset_dt();
-  double compute_vector(int);
+  ~FixController() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  void reset_dt() override;
+  double compute_vector(int) override;
 
  private:
   double kp, ki, kd, alpha, tau;

src/EXTRA-FIX/fix_drag.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixDrag : public Fix {
  public:
   FixDrag(class LAMMPS *, int, char **);
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  double compute_vector(int);
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double compute_vector(int) override;
 
  private:
   double xc, yc, zc;

src/EXTRA-FIX/fix_electron_stopping.h

@@ -32,12 +32,12 @@ namespace LAMMPS_NS {
 class FixElectronStopping : public Fix {
  public:
   FixElectronStopping(class LAMMPS *, int, char **);
-  ~FixElectronStopping();
-  int setmask();
-  void init();
-  void post_force(int);
-  void init_list(int, class NeighList *);
-  double compute_scalar();
+  ~FixElectronStopping() override;
+  int setmask() override;
+  void init() override;
+  void post_force(int) override;
+  void init_list(int, class NeighList *) override;
+  double compute_scalar() override;
 
  private:
   void read_table(const char *);

src/EXTRA-FIX/fix_electron_stopping_fit.h

@@ -32,13 +32,13 @@ namespace LAMMPS_NS {
 class FixElectronStoppingFit : public Fix {
  public:
   FixElectronStoppingFit(class LAMMPS *, int, char **);
-  ~FixElectronStoppingFit();
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  double compute_scalar();
+  ~FixElectronStoppingFit() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double compute_scalar() override;
 
  private:
   double *energy_coh_in, *v_min_sq, *v_max_sq, *drag_fac_in_1, *drag_fac_in_2, *drag_fac_1,

src/EXTRA-FIX/fix_ffl.h

@@ -27,22 +27,22 @@ namespace LAMMPS_NS {
 class FixFFL : public Fix {
  public:
   FixFFL(class LAMMPS *, int, char **);
-  virtual ~FixFFL();
-  int setmask();
-  void init();
-  void setup(int);
+  ~FixFFL() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
   void ffl_integrate();
-  void initial_integrate_respa(int vflag, int ilevel, int iloop);
-  void final_integrate_respa(int ilevel, int iloop);
-  void initial_integrate(int vflag);
-  void final_integrate();
-  double compute_scalar();
-  void reset_target(double);
-  virtual void reset_dt();
-  double memory_usage();
-  void grow_arrays(int);
+  void initial_integrate_respa(int vflag, int ilevel, int iloop) override;
+  void final_integrate_respa(int ilevel, int iloop) override;
+  void initial_integrate(int vflag) override;
+  void final_integrate() override;
+  double compute_scalar() override;
+  void reset_target(double) override;
+  void reset_dt() override;
+  double memory_usage() override;
+  void grow_arrays(int) override;
 
-  virtual void *extract(const char *, int &);
+  void *extract(const char *, int &) override;
 
   void init_ffl();
 

src/EXTRA-FIX/fix_filter_corotate.h

@@ -32,31 +32,31 @@ namespace LAMMPS_NS {
 class FixFilterCorotate : public Fix {
  public:
   FixFilterCorotate(class LAMMPS *, int, char **);
-  ~FixFilterCorotate();
-  void setup(int);
-  void setup_pre_neighbor();
-  void pre_neighbor();
-  void setup_pre_force_respa(int, int);
+  ~FixFilterCorotate() override;
+  void setup(int) override;
+  void setup_pre_neighbor() override;
+  void pre_neighbor() override;
+  void setup_pre_force_respa(int, int) override;
   //    void setup_post_force_respa(int,int);
-  void pre_force_respa(int, int, int);
-  void post_force_respa(int, int, int);
+  void pre_force_respa(int, int, int) override;
+  void post_force_respa(int, int, int) override;
 
-  void init();
-  int setmask();
+  void init() override;
+  int setmask() override;
 
-  double compute_array(int, int);
+  double compute_array(int, int) override;
 
-  int pack_forward_comm(int, int *, double *, int, int *);
-  void unpack_forward_comm(int, int, double *);
-  void grow_arrays(int);
-  double memory_usage();
+  int pack_forward_comm(int, int *, double *, int, int *) override;
+  void unpack_forward_comm(int, int, double *) override;
+  void grow_arrays(int) override;
+  double memory_usage() override;
 
-  void copy_arrays(int, int, int);
-  void set_arrays(int);
-  void update_arrays(int, int);
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
+  void update_arrays(int, int) override;
 
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
 
  protected:
   int me, nprocs;

src/EXTRA-FIX/fix_flow_gauss.h

@@ -29,13 +29,13 @@ namespace LAMMPS_NS {
 class FixFlowGauss : public Fix {
  public:
   FixFlowGauss(class LAMMPS *, int, char **);
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  double compute_scalar();
-  double compute_vector(int n);
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double compute_scalar() override;
+  double compute_vector(int n) override;
 
  protected:
   int dimension;

src/EXTRA-FIX/fix_gld.h

@@ -27,25 +27,25 @@ namespace LAMMPS_NS {
 class FixGLD : public Fix {
  public:
   FixGLD(class LAMMPS *, int, char **);
-  virtual ~FixGLD();
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void initial_integrate_respa(int, int, int);
-  virtual void final_integrate_respa(int, int);
-  void reset_target(double);
-  virtual void reset_dt();
+  ~FixGLD() override;
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void reset_target(double) override;
+  void reset_dt() override;
 
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
   void init_s_gld();
 
  protected:

src/EXTRA-FIX/fix_gle.h

@@ -27,30 +27,30 @@ namespace LAMMPS_NS {
 class FixGLE : public Fix {
  public:
   FixGLE(class LAMMPS *, int, char **);
-  virtual ~FixGLE();
-  int setmask();
-  void init();
-  void setup(int);
+  ~FixGLE() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
   void gle_integrate();
-  void initial_integrate_respa(int vflag, int ilevel, int iloop);
-  void final_integrate_respa(int ilevel, int iloop);
-  void initial_integrate(int vflag);
-  void final_integrate();
-  double compute_scalar();
-  void reset_target(double);
-  virtual void reset_dt();
+  void initial_integrate_respa(int vflag, int ilevel, int iloop) override;
+  void final_integrate_respa(int ilevel, int iloop) override;
+  void initial_integrate(int vflag) override;
+  void final_integrate() override;
+  double compute_scalar() override;
+  void reset_target(double) override;
+  void reset_dt() override;
 
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
 
-  virtual void *extract(const char *, int &);
+  void *extract(const char *, int &) override;
 
   void init_gle();
   void init_gles();

src/EXTRA-FIX/fix_momentum_chunk.h

@@ -27,11 +27,11 @@ namespace LAMMPS_NS {
 class FixMomentumChunk : public Fix {
  public:
   FixMomentumChunk(class LAMMPS *, int, char **);
-  virtual ~FixMomentumChunk();
-  int setmask();
-  void init();
-  void end_of_step();
-  void post_run();
+  ~FixMomentumChunk() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  void post_run() override;
 
  protected:
   std::string id_chunk, id_com, id_vcm, id_omega;

src/EXTRA-FIX/fix_npt_cauchy.h

@@ -27,27 +27,27 @@ namespace LAMMPS_NS {
 class FixNPTCauchy : public Fix {
  public:
   FixNPTCauchy(class LAMMPS *, int, char **);
-  virtual void post_constructor();
-  virtual ~FixNPTCauchy();
-  int setmask();
-  virtual void init();
-  virtual void setup(int);
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  void initial_integrate_respa(int, int, int);
-  void pre_force_respa(int, int, int);
-  void final_integrate_respa(int, int);
-  virtual void pre_exchange();
-  double compute_scalar();
-  virtual double compute_vector(int);
-  void write_restart(FILE *);
+  void post_constructor() override;
+  ~FixNPTCauchy() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void pre_force_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void pre_exchange() override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
+  void write_restart(FILE *) override;
   virtual int pack_restart_data(double *);    // pack restart data
-  virtual void restart(char *);
-  int modify_param(int, char **);
-  void reset_target(double);
-  void reset_dt();
-  virtual void *extract(const char *, int &);
-  double memory_usage();
+  void restart(char *) override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  void reset_dt() override;
+  void *extract(const char *, int &) override;
+  double memory_usage() override;
 
  protected:
   int dimension, which;

src/EXTRA-FIX/fix_numdiff.h

@@ -27,15 +27,15 @@ namespace LAMMPS_NS {
 class FixNumDiff : public Fix {
  public:
   FixNumDiff(class LAMMPS *, int, char **);
-  ~FixNumDiff();
-  int setmask();
-  void init();
-  void setup(int);
-  void min_setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  void min_post_force(int);
-  double memory_usage();
+  ~FixNumDiff() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  void min_post_force(int) override;
+  double memory_usage() override;
 
  private:
   double delta;

src/EXTRA-FIX/fix_nvk.h

@@ -27,14 +27,14 @@ namespace LAMMPS_NS {
 class FixNVK : public Fix {
  public:
   FixNVK(class LAMMPS *, int, char **);
-  virtual ~FixNVK() {}
-  int setmask();
-  virtual void init();
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void initial_integrate_respa(int, int, int);
-  virtual void final_integrate_respa(int, int);
-  virtual void reset_dt();
+
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void reset_dt() override;
 
  protected:
   double dtv, dtf;

src/EXTRA-FIX/fix_oneway.h

@@ -27,10 +27,10 @@ namespace LAMMPS_NS {
 class FixOneWay : public Fix {
  public:
   FixOneWay(class LAMMPS *, int, char **);
-  virtual ~FixOneWay();
-  int setmask();
-  virtual void init();
-  virtual void end_of_step();
+  ~FixOneWay() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
 
  protected:
   int direction;

src/EXTRA-FIX/fix_pafi.h

@@ -27,25 +27,25 @@ namespace LAMMPS_NS {
 class FixPAFI : public Fix {
  public:
   FixPAFI(class LAMMPS *, int, char **);
-  virtual ~FixPAFI();
-  int setmask();
-  virtual void init();
+  ~FixPAFI() override;
+  int setmask() override;
+  void init() override;
 
-  void setup(int);
-  void min_setup(int);
-  virtual void post_force(int);
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
 
-  void post_force_respa(int, int, int);
-  void min_post_force(int);
-  double compute_vector(int);
+  void post_force_respa(int, int, int) override;
+  void min_post_force(int) override;
+  double compute_vector(int) override;
   // nve
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void initial_integrate_respa(int, int, int);
-  virtual void final_integrate_respa(int, int);
-  virtual void reset_dt();
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void initial_integrate_respa(int, int, int) override;
+  void final_integrate_respa(int, int) override;
+  void reset_dt() override;
 
-  double memory_usage();
+  double memory_usage() override;
 
  protected:
   int varflag, icompute;

src/EXTRA-FIX/fix_rhok.h

@@ -27,32 +27,31 @@ class FixRhok : public Fix {
   // Constructor: all the parameters to this fix specified in
   // the LAMMPS input get passed in
   FixRhok(LAMMPS *inLMP, int inArgc, char **inArgv);
-  virtual ~FixRhok(){};
 
   // Methods that this fix implements
   // --------------------------------
 
   // Tells LAMMPS where this fix should act
-  int setmask();
+  int setmask() override;
 
   // Initializes the fix at the beginning of a run
-  void init();
+  void init() override;
 
   // Initial application of the fix to a system (when doing MD / minimization)
-  void setup(int inVFlag);
-  void min_setup(int inVFlag);
+  void setup(int inVFlag) override;
+  void min_setup(int inVFlag) override;
 
   // Modify the forces calculated in the main force loop, either when
   // doing usual MD, RESPA MD or minimization
-  void post_force(int inVFlag);
-  void post_force_respa(int inVFlag, int inILevel, int inILoop);
-  void min_post_force(int inVFlag);
+  void post_force(int inVFlag) override;
+  void post_force_respa(int inVFlag, int inILevel, int inILoop) override;
+  void min_post_force(int inVFlag) override;
 
   // Compute the change in the potential energy induced by this fix
-  double compute_scalar();
+  double compute_scalar() override;
 
   // Compute the ith component of the vector associated with this fix
-  double compute_vector(int inI);
+  double compute_vector(int inI) override;
 
  private:
   // RESPA boilerplate

src/EXTRA-FIX/fix_smd.h

@@ -27,15 +27,15 @@ namespace LAMMPS_NS {
 class FixSMD : public Fix {
  public:
   FixSMD(class LAMMPS *, int, char **);
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  double compute_vector(int);
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double compute_vector(int) override;
 
-  void write_restart(FILE *);
-  void restart(char *);
+  void write_restart(FILE *) override;
+  void restart(char *) override;
 
  private:
   double xc, yc, zc, xn, yn, zn, r0;

src/EXTRA-FIX/fix_spring_rg.h

@@ -27,14 +27,14 @@ namespace LAMMPS_NS {
 class FixSpringRG : public Fix {
  public:
   FixSpringRG(class LAMMPS *, int, char **);
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  void write_restart(FILE *);
-  void restart(char *);
-  double compute_scalar();
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  double compute_scalar() override;
 
  private:
   int ilevel_respa, rg0_flag;

src/EXTRA-FIX/fix_temp_csld.h

@@ -27,16 +27,16 @@ namespace LAMMPS_NS {
 class FixTempCSLD : public Fix {
  public:
   FixTempCSLD(class LAMMPS *, int, char **);
-  ~FixTempCSLD();
-  int setmask();
-  void init();
-  void end_of_step();
-  int modify_param(int, char **);
-  void reset_target(double);
-  virtual double compute_scalar();
-  void write_restart(FILE *);
-  void restart(char *buf);
-  virtual void *extract(const char *, int &);
+  ~FixTempCSLD() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  double compute_scalar() override;
+  void write_restart(FILE *) override;
+  void restart(char *buf) override;
+  void *extract(const char *, int &) override;
 
  private:
   double t_start, t_stop, t_period, t_target;

src/EXTRA-FIX/fix_temp_csvr.h

@@ -27,16 +27,16 @@ namespace LAMMPS_NS {
 class FixTempCSVR : public Fix {
  public:
   FixTempCSVR(class LAMMPS *, int, char **);
-  ~FixTempCSVR();
-  int setmask();
-  void init();
-  void end_of_step();
-  int modify_param(int, char **);
-  void reset_target(double);
-  virtual double compute_scalar();
-  void write_restart(FILE *);
-  void restart(char *buf);
-  virtual void *extract(const char *, int &);
+  ~FixTempCSVR() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  int modify_param(int, char **) override;
+  void reset_target(double) override;
+  double compute_scalar() override;
+  void write_restart(FILE *) override;
+  void restart(char *buf) override;
+  void *extract(const char *, int &) override;
 
  private:
   double t_start, t_stop, t_period, t_target;

src/EXTRA-FIX/fix_ti_spring.h

@@ -34,27 +34,27 @@ namespace LAMMPS_NS {
 class FixTISpring : public Fix {
  public:
   FixTISpring(class LAMMPS *, int, char **);
-  ~FixTISpring();
-  int setmask();
-  void init();
-  void setup(int);
-  void min_setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  void min_post_force(int);
-  void initial_integrate(int);
-  double compute_scalar();
-  double compute_vector(int);
+  ~FixTISpring() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  void min_post_force(int) override;
+  void initial_integrate(int) override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
 
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
 
  private:
   double switch_func(double);     // Switching function.

src/EXTRA-FIX/fix_tmd.h

@@ -27,18 +27,18 @@ namespace LAMMPS_NS {
 class FixTMD : public Fix {
  public:
   FixTMD(class LAMMPS *, int, char **);
-  ~FixTMD();
-  int setmask();
-  void init();
-  void initial_integrate(int);
-  void initial_integrate_respa(int, int, int);
+  ~FixTMD() override;
+  int setmask() override;
+  void init() override;
+  void initial_integrate(int) override;
+  void initial_integrate_respa(int, int, int) override;
 
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  void reset_dt();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  void reset_dt() override;
 
  private:
   int me;

src/EXTRA-FIX/fix_ttm.h

@@ -28,26 +28,26 @@ namespace LAMMPS_NS {
 class FixTTM : public Fix {
  public:
   FixTTM(class LAMMPS *, int, char **);
-  virtual ~FixTTM();
-  virtual void post_constructor();
-  int setmask();
-  virtual void init();
-  void setup(int);
+  ~FixTTM() override;
+  void post_constructor() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
   void post_force_setup(int);
-  virtual void post_force(int);
+  void post_force(int) override;
   void post_force_respa_setup(int, int, int);
-  void post_force_respa(int, int, int);
-  virtual void end_of_step();
-  void reset_dt();
-  void grow_arrays(int);
-  virtual void write_restart(FILE *);
-  virtual void restart(char *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
-  virtual double compute_vector(int);
-  virtual double memory_usage();
+  void post_force_respa(int, int, int) override;
+  void end_of_step() override;
+  void reset_dt() override;
+  void grow_arrays(int) override;
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
+  double compute_vector(int) override;
+  double memory_usage() override;
 
  protected:
   int nlevels_respa;

src/EXTRA-FIX/fix_ttm_grid.h

@@ -27,25 +27,25 @@ namespace LAMMPS_NS {
 class FixTTMGrid : public FixTTM {
  public:
   FixTTMGrid(class LAMMPS *, int, char **);
-  ~FixTTMGrid();
-  void post_constructor();
-  void init();
-  void post_force(int);
-  void end_of_step();
+  ~FixTTMGrid() override;
+  void post_constructor() override;
+  void init() override;
+  void post_force(int) override;
+  void end_of_step() override;
 
   // grid communication
 
-  void pack_forward_grid(int, void *, int, int *);
-  void unpack_forward_grid(int, void *, int, int *);
-  void pack_reverse_grid(int, void *, int, int *);
-  void unpack_reverse_grid(int, void *, int, int *);
-  void pack_gather_grid(int, void *);
-  void unpack_gather_grid(int, void *, void *, int, int, int, int, int, int);
+  void pack_forward_grid(int, void *, int, int *) override;
+  void unpack_forward_grid(int, void *, int, int *) override;
+  void pack_reverse_grid(int, void *, int, int *) override;
+  void unpack_reverse_grid(int, void *, int, int *) override;
+  void pack_gather_grid(int, void *) override;
+  void unpack_gather_grid(int, void *, void *, int, int, int, int, int, int) override;
 
-  void write_restart(FILE *);
-  void restart(char *);
-  double compute_vector(int);
-  double memory_usage();
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  double compute_vector(int) override;
+  double memory_usage() override;
 
  private:
   int ngridmine,ngridout;
@@ -59,10 +59,10 @@ class FixTTMGrid : public FixTTM {
   int ngc_buf1,ngc_buf2;
   double *gc_buf1,*gc_buf2;
 
-  void allocate_grid();
-  void deallocate_grid();
-  void read_electron_temperatures(const std::string &);
-  void write_electron_temperatures(const std::string &);
+  void allocate_grid() override;
+  void deallocate_grid() override;
+  void read_electron_temperatures(const std::string &) override;
+  void write_electron_temperatures(const std::string &) override;
 };
 
 }    // namespace LAMMPS_NS

src/EXTRA-FIX/fix_ttm_mod.h

@@ -33,25 +33,25 @@ struct el_heat_capacity_thermal_conductivity {
 class FixTTMMod : public Fix {
  public:
   FixTTMMod(class LAMMPS *, int, char **);
-  ~FixTTMMod();
-  int setmask();
-  void init();
-  void setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
+  ~FixTTMMod() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
   void post_force_setup(int);
   void post_force_respa_setup(int, int, int);
-  void end_of_step();
-  void reset_dt();
-  void write_restart(FILE *);
-  void restart(char *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
-  double memory_usage();
-  void grow_arrays(int);
-  double compute_vector(int);
+  void end_of_step() override;
+  void reset_dt() override;
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  double compute_vector(int) override;
 
  private:
   int nlevels_respa;

src/EXTRA-FIX/fix_viscosity.h

@@ -27,11 +27,11 @@ namespace LAMMPS_NS {
 class FixViscosity : public Fix {
  public:
   FixViscosity(class LAMMPS *, int, char **);
-  ~FixViscosity();
-  int setmask();
-  void init();
-  void end_of_step();
-  double compute_scalar();
+  ~FixViscosity() override;
+  int setmask() override;
+  void init() override;
+  void end_of_step() override;
+  double compute_scalar() override;
 
  private:
   int me;

src/EXTRA-FIX/fix_wall_ees.h

@@ -27,9 +27,9 @@ namespace LAMMPS_NS {
 class FixWallEES : public FixWall {
  public:
   FixWallEES(class LAMMPS *, int, char **);
-  void precompute(int);
-  void init();
-  void wall_particle(int, int, double);
+  void precompute(int) override;
+  void init() override;
+  void wall_particle(int, int, double) override;
 
  private:
   double coeff1[6], coeff2[6], coeff3[6], coeff4[6], coeff5[6], coeff6[6];

src/EXTRA-FIX/fix_wall_reflect_stochastic.h

@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class FixWallReflectStochastic : public FixWallReflect {
  public:
   FixWallReflectStochastic(class LAMMPS *, int, char **);
-  virtual ~FixWallReflectStochastic();
+  ~FixWallReflectStochastic() override;
 
  private:
   int seedfix;
@@ -36,7 +36,7 @@ class FixWallReflectStochastic : public FixWallReflect {
 
   class RanMars *random;
 
-  void wall_particle(int m, int which, double coord);
+  void wall_particle(int m, int which, double coord) override;
 };
 
 }    // namespace LAMMPS_NS

src/EXTRA-FIX/fix_wall_region_ees.h

@@ -27,16 +27,16 @@ namespace LAMMPS_NS {
 class FixWallRegionEES : public Fix {
  public:
   FixWallRegionEES(class LAMMPS *, int, char **);
-  ~FixWallRegionEES();
-  int setmask();
-  void init();
-  void setup(int);
-  void min_setup(int);
-  void post_force(int);
-  void post_force_respa(int, int, int);
-  void min_post_force(int);
-  double compute_scalar();
-  double compute_vector(int);
+  ~FixWallRegionEES() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  void min_post_force(int) override;
+  double compute_scalar() override;
+  double compute_vector(int) override;
 
  private:
   class AtomVecEllipsoid *avec;

src/FEP/fix_adapt_fep.h

@@ -30,16 +30,16 @@ class FixAdaptFEP : public Fix {
   int chgflag;
 
   FixAdaptFEP(class LAMMPS *, int, char **);
-  ~FixAdaptFEP();
-  int setmask();
-  void post_constructor();
-  void init();
-  void setup_pre_force(int);
-  void pre_force(int);
-  void post_run();
-  void setup_pre_force_respa(int, int);
-  void pre_force_respa(int, int, int);
-  void set_arrays(int);
+  ~FixAdaptFEP() override;
+  int setmask() override;
+  void post_constructor() override;
+  void init() override;
+  void setup_pre_force(int) override;
+  void pre_force(int) override;
+  void post_run() override;
+  void setup_pre_force_respa(int, int) override;
+  void pre_force_respa(int, int, int) override;
+  void set_arrays(int) override;
 
  private:
   int nadapt, resetflag, scaleflag, afterflag;

src/GPU/fix_gpu.h

@@ -27,15 +27,15 @@ namespace LAMMPS_NS {
 class FixGPU : public Fix {
  public:
   FixGPU(class LAMMPS *, int, char **);
-  ~FixGPU();
-  int setmask();
-  void init();
-  void setup(int);
-  void min_setup(int);
-  void post_force(int);
-  void min_post_force(int);
-  void post_force_respa(int, int, int);
-  double memory_usage();
+  ~FixGPU() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void min_setup(int) override;
+  void post_force(int) override;
+  void min_post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double memory_usage() override;
 
   double binsize(const double subx, const double suby, const double subz, const int nlocal,
                  const double cut);

src/GPU/fix_nh_gpu.h

@@ -25,21 +25,21 @@ namespace LAMMPS_NS {
 class FixNHGPU : public FixNH {
  public:
   FixNHGPU(class LAMMPS *, int, char **);
-  virtual ~FixNHGPU();
-  virtual void setup(int vflag);
-  void reset_dt();
-  virtual void final_integrate();
-  virtual double memory_usage();
+  ~FixNHGPU() override;
+  void setup(int vflag) override;
+  void reset_dt() override;
+  void final_integrate() override;
+  double memory_usage() override;
 
  protected:
   double *_dtfm;
   int _nlocal3, _nlocal_max, _respa_on;
 
-  virtual void remap();
-  virtual void nve_x();
-  virtual void nve_v();
-  virtual void nh_v_press();
-  virtual void nh_v_temp();
+  void remap() override;
+  void nve_x() override;
+  void nve_v() override;
+  void nh_v_press() override;
+  void nh_v_temp() override;
 };
 
 }    // namespace LAMMPS_NS

src/GPU/fix_npt_gpu.h

@@ -31,7 +31,6 @@ namespace LAMMPS_NS {
 class FixNPTGPU : public FixNHGPU {
  public:
   FixNPTGPU(class LAMMPS *, int, char **);
-  ~FixNPTGPU() {}
 };
 
 }    // namespace LAMMPS_NS

src/GPU/fix_nve_asphere_gpu.h

@@ -31,12 +31,12 @@ namespace LAMMPS_NS {
 class FixNVEAsphereGPU : public FixNVE {
  public:
   FixNVEAsphereGPU(class LAMMPS *, int, char **);
-  void init();
-  void setup(int vflag);
-  void initial_integrate(int);
-  void final_integrate();
-  void reset_dt();
-  virtual double memory_usage();
+  void init() override;
+  void setup(int vflag) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
+  double memory_usage() override;
 
  private:
   double reset_dt_omp(const int, const int, const int);

src/GPU/fix_nve_gpu.h

@@ -31,12 +31,12 @@ namespace LAMMPS_NS {
 class FixNVEGPU : public FixNVE {
  public:
   FixNVEGPU(class LAMMPS *, int, char **);
-  virtual ~FixNVEGPU();
-  virtual void setup(int);
-  virtual void initial_integrate(int);
-  virtual void final_integrate();
-  virtual void reset_dt();
-  virtual double memory_usage();
+  ~FixNVEGPU() override;
+  void setup(int) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
+  double memory_usage() override;
 
  protected:
   void reset_dt_omp(const int, const int, const int);

src/GPU/fix_nvt_gpu.h

@@ -31,7 +31,6 @@ namespace LAMMPS_NS {
 class FixNVTGPU : public FixNHGPU {
  public:
   FixNVTGPU(class LAMMPS *, int, char **);
-  ~FixNVTGPU() {}
 };
 
 }    // namespace LAMMPS_NS

src/GRANULAR/fix_freeze.h

@@ -27,12 +27,12 @@ namespace LAMMPS_NS {
 class FixFreeze : public Fix {
  public:
   FixFreeze(class LAMMPS *, int, char **);
-  int setmask();
-  void init();
-  void setup(int);
-  virtual void post_force(int);
-  void post_force_respa(int, int, int);
-  double compute_vector(int);
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
+  double compute_vector(int) override;
 
  protected:
   int force_flag;

src/GRANULAR/fix_pour.h

@@ -27,13 +27,13 @@ namespace LAMMPS_NS {
 class FixPour : public Fix {
  public:
   FixPour(class LAMMPS *, int, char **);
-  ~FixPour();
-  int setmask();
-  void init();
-  void setup_pre_exchange();
-  void pre_exchange();
-  void reset_dt();
-  void *extract(const char *, int &);
+  ~FixPour() override;
+  int setmask() override;
+  void init() override;
+  void setup_pre_exchange() override;
+  void pre_exchange() override;
+  void reset_dt() override;
+  void *extract(const char *, int &) override;
 
  private:
   int ninsert, ntype, seed;

src/GRANULAR/fix_wall_gran.h

@@ -30,24 +30,24 @@ class FixWallGran : public Fix {
   enum { NORMAL_NONE, NORMAL_HOOKE, NORMAL_HERTZ, HERTZ_MATERIAL, DMT, JKR };
 
   FixWallGran(class LAMMPS *, int, char **);
-  virtual ~FixWallGran();
-  int setmask();
-  virtual void init();
-  void setup(int);
-  virtual void post_force(int);
-  virtual void post_force_respa(int, int, int);
+  ~FixWallGran() override;
+  int setmask() override;
+  void init() override;
+  void setup(int) override;
+  void post_force(int) override;
+  void post_force_respa(int, int, int) override;
 
-  virtual double memory_usage();
-  virtual void grow_arrays(int);
-  virtual void copy_arrays(int, int, int);
-  virtual void set_arrays(int);
-  virtual int pack_exchange(int, double *);
-  virtual int unpack_exchange(int, double *);
-  virtual int pack_restart(int, double *);
-  virtual void unpack_restart(int, int);
-  virtual int size_restart(int);
-  virtual int maxsize_restart();
-  void reset_dt();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
+  void reset_dt() override;
 
   void hooke(double, double, double, double, double *, double *, double *, double *, double *,
              double, double, double *);

src/GRANULAR/fix_wall_gran_region.h

@@ -27,22 +27,22 @@ namespace LAMMPS_NS {
 class FixWallGranRegion : public FixWallGran {
  public:
   FixWallGranRegion(class LAMMPS *, int, char **);
-  ~FixWallGranRegion();
-  void post_force(int);
-  void write_restart(FILE *);
-  void restart(char *);
-  void init();
+  ~FixWallGranRegion() override;
+  void post_force(int) override;
+  void write_restart(FILE *) override;
+  void restart(char *) override;
+  void init() override;
 
-  double memory_usage();
-  void grow_arrays(int);
-  void copy_arrays(int, int, int);
-  void set_arrays(int);
-  int pack_exchange(int, double *);
-  int unpack_exchange(int, double *);
-  int pack_restart(int, double *);
-  void unpack_restart(int, int);
-  int size_restart(int);
-  int maxsize_restart();
+  double memory_usage() override;
+  void grow_arrays(int) override;
+  void copy_arrays(int, int, int) override;
+  void set_arrays(int) override;
+  int pack_exchange(int, double *) override;
+  int unpack_exchange(int, double *) override;
+  int pack_restart(int, double *) override;
+  void unpack_restart(int, int) override;
+  int size_restart(int) override;
+  int maxsize_restart() override;
 
  private:
   class Region *region;

src/INTEL/fix_nh_intel.h

@@ -26,20 +26,20 @@ namespace LAMMPS_NS {
 class FixNHIntel : public FixNH {
  public:
   FixNHIntel(class LAMMPS *, int, char **);
-  virtual ~FixNHIntel();
-  virtual void setup(int vflag);
-  void reset_dt();
-  virtual double memory_usage();
+  ~FixNHIntel() override;
+  void setup(int vflag) override;
+  void reset_dt() override;
+  double memory_usage() override;
 
  protected:
   double *_dtfm;
   int _nlocal3, _nlocal_max;
 
-  virtual void remap();
-  virtual void nve_x();
-  virtual void nve_v();
-  virtual void nh_v_press();
-  virtual void nh_v_temp();
+  void remap() override;
+  void nve_x() override;
+  void nve_v() override;
+  void nh_v_press() override;
+  void nh_v_temp() override;
 };
 
 }

src/INTEL/fix_npt_intel.h

@@ -32,7 +32,6 @@ namespace LAMMPS_NS {
 class FixNPTIntel : public FixNHIntel {
  public:
   FixNPTIntel(class LAMMPS *, int, char **);
-  ~FixNPTIntel() {}
 };
 
 }    // namespace LAMMPS_NS

src/INTEL/fix_nve_asphere_intel.h

@@ -32,12 +32,12 @@ namespace LAMMPS_NS {
 class FixNVEAsphereIntel : public FixNVE {
  public:
   FixNVEAsphereIntel(class LAMMPS *, int, char **);
-  void init();
-  void setup(int vflag);
-  void initial_integrate(int);
-  void final_integrate();
-  void reset_dt();
-  virtual double memory_usage();
+  void init() override;
+  void setup(int vflag) override;
+  void initial_integrate(int) override;
+  void final_integrate() override;
+  void reset_dt() override;
+  double memory_usage() override;
 
  private:
   double *_dtfm, *_inertia0, *_inertia1, *_inertia2;