fix up some comments

src/BODY/body_rounded_polygon.cpp

@@ -321,7 +321,7 @@ void BodyRoundedPolygon::data_body(int ibonus, int ninteger, int ndouble,
 
 /* ----------------------------------------------------------------------
    pack data struct for one body into buf for writing to data file
-   if buf is nullptr, just return buffer size
+   if buf is a null pointer, just return buffer size
 ------------------------------------------------------------------------- */
 
 int BodyRoundedPolygon::pack_data_body(tagint atomID, int ibonus, double *buf)

src/BODY/body_rounded_polyhedron.cpp

@@ -373,7 +373,7 @@ void BodyRoundedPolyhedron::data_body(int ibonus, int ninteger, int ndouble,
 
 /* ----------------------------------------------------------------------
    pack data struct for one body into buf for writing to data file
-   if buf is nullptr, just return buffer size
+   if buf is a null pointer, just return buffer size
 ------------------------------------------------------------------------- */
 
 int BodyRoundedPolyhedron::pack_data_body(tagint atomID, int ibonus, double *buf)

src/BODY/fix_wall_body_polygon.cpp

@@ -226,7 +226,7 @@ void FixWallBodyPolygon::post_force(int /*vflag*/)
   // dx,dy,dz = signed distance from wall
   // for rotating cylinder, reset vwall based on particle position
   // skip atom if not close enough to wall
-  //   if wall was set to nullptr, it's skipped since lo/hi are infinity
+  //   if wall was set to a null pointer, it's skipped since lo/hi are infinity
   // compute force and torque on atom if close enough to wall
   //   via wall potential matched to pair potential
 

src/BODY/fix_wall_body_polyhedron.cpp

@@ -233,7 +233,7 @@ void FixWallBodyPolyhedron::post_force(int /*vflag*/)
   // dx,dy,dz = signed distance from wall
   // for rotating cylinder, reset vwall based on particle position
   // skip atom if not close enough to wall
-  //   if wall was set to nullptr, it's skipped since lo/hi are infinity
+  //   if wall was set to a null pointer, it's skipped since lo/hi are infinity
   // compute force and torque on atom if close enough to wall
   //   via wall potential matched to pair potential
 

src/BODY/pair_body_rounded_polyhedron.cpp

@@ -1880,7 +1880,7 @@ void PairBodyRoundedPolyhedron::project_pt_plane(const double* q,
     face_index  = face index of the body
     xmi         = atom i's coordinates
     q1          = tested point on the face (e.g. the projection of a point)
-    q2          = another point (can be nullptr) for face-edge intersection
+    q2          = another point (can be a null pointer) for face-edge intersection
   Output:
     inside1     = 1 if q1 is inside the polygon, 0 otherwise
     inside2     = 1 if q2 is inside the polygon, 0 otherwise

src/GPU/pppm_gpu.cpp

@@ -117,7 +117,7 @@ void PPPMGPU::init()
   //      thru its deallocate(), allocate()
   // NOTE: could free density_brick and vdxyz_brick after PPPM allocates them,
   //       before allocating db_gpu and vd_brick down below, if don't need,
-  //       if do this, make sure to set them to nullptr
+  //       if do this, make sure to set them to a null pointer
 
   destroy_3d_offset(density_brick_gpu,nzlo_out,nylo_out);
   destroy_3d_offset(vd_brick,nzlo_out,nylo_out);

src/GRANULAR/fix_wall_gran.cpp

@@ -416,7 +416,7 @@ FixWallGran::FixWallGran(LAMMPS *lmp, int narg, char **arg) :
   mass_rigid = nullptr;
 
   // initialize history as if particle is not touching region
-  // history_one will be nullptr for wallstyle = REGION
+  // history_one will be a null pointer for wallstyle = REGION
 
   if (use_history && history_one) {
     int nlocal = atom->nlocal;
@@ -576,7 +576,7 @@ void FixWallGran::post_force(int /*vflag*/)
   // dx,dy,dz = signed distance from wall
   // for rotating cylinder, reset vwall based on particle position
   // skip atom if not close enough to wall
-  //   if wall was set to nullptr, it's skipped since lo/hi are infinity
+  //   if wall was set to a null pointer, it's skipped since lo/hi are infinity
   // compute force and torque on atom if close enough to wall
   //   via wall potential matched to pair potential
   // set history if pair potential stores history

src/GRANULAR/fix_wall_gran.h

@@ -103,7 +103,7 @@ class FixWallGran : public Fix {
 
   // rigid body masses for use in granular interactions
 
-  class Fix *fix_rigid;    // ptr to rigid body fix, nullptr if none
+  class Fix *fix_rigid;    // ptr to rigid body fix, null pointer if none
   double *mass_rigid;      // rigid mass for owned+ghost atoms
   int nmax;                // allocated size of mass_rigid
 

src/GRANULAR/pair_gran_hooke_history.h

@@ -61,7 +61,7 @@ class PairGranHookeHistory : public Pair {
 
   // storage of rigid body masses for use in granular interactions
 
-  class Fix *fix_rigid;    // ptr to rigid body fix, nullptr if none
+  class Fix *fix_rigid;    // ptr to rigid body fix, null pointer if none
   double *mass_rigid;      // rigid mass for owned+ghost atoms
   int nmax;                // allocated size of mass_rigid
 

src/GRANULAR/pair_granular.h

@@ -56,7 +56,7 @@ class PairGranular : public Pair {
 
   // storage of rigid body masses for use in granular interactions
 
-  class Fix *fix_rigid;    // ptr to rigid body fix, nullptr if none
+  class Fix *fix_rigid;    // ptr to rigid body fix, null pointer if none
   double *mass_rigid;      // rigid mass for owned+ghost atoms
   int nmax;                // allocated size of mass_rigid
 

src/KIM/fix_store_kim.h

@@ -79,8 +79,8 @@ class FixStoreKIM : public Fix {
  private:
   void *simulator_model;        // pointer to KIM simulator model class
   void *model_name;             // string of KIM model name
-  void *model_units;            // string of unit conversion origin or nullptr
-  void *user_units;             // string of unit conversion target or nullptr
+  void *model_units;            // string of unit conversion origin or null pointer
+  void *user_units;             // string of unit conversion target or null pointer
 };
 
 }

src/KIM/kim_interactions.cpp

@@ -108,7 +108,7 @@ void KimInteractions::do_setup(int narg, char **arg)
 
   // check if we had a kim_init command by finding fix STORE/KIM
   // retrieve model name and pointer to simulator model class instance.
-  // validate model name if not given as nullptr.
+  // validate model name if not given as null pointer.
 
   int ifix = modify->find_fix("KIM_MODEL_STORE");
   if (ifix >= 0) {

src/KOKKOS/atom_kokkos.cpp

@@ -282,7 +282,7 @@ int AtomKokkos::add_custom(const char *name, int flag)
 
 /* ----------------------------------------------------------------------
    remove a custom variable of type flag = 0/1 for int/double at index
-   free memory for vector and name and set ptrs to nullptr
+   free memory for vector and name and set ptrs to a null pointer
    ivector/dvector and iname/dname lists never shrink
 ------------------------------------------------------------------------- */
 

src/KOKKOS/pair_kokkos.h

@@ -94,7 +94,7 @@ struct PairComputeFunctor  {
     dup_vatom = Kokkos::Experimental::create_scatter_view<Kokkos::Experimental::ScatterSum, typename NeedDup<NEIGHFLAG,device_type>::value >(c.d_vatom);
   };
 
-  // Call cleanup_copy which sets allocations nullptr which are destructed by the PairStyle
+  // Call cleanup_copy which sets allocations to null which are destructed by the PairStyle
   ~PairComputeFunctor() {c.cleanup_copy();list.copymode = 1;};
 
   KOKKOS_INLINE_FUNCTION int sbmask(const int& j) const {

src/LATTE/fix_latte.cpp

@@ -74,7 +74,7 @@ FixLatte::FixLatte(LAMMPS *lmp, int narg, char **arg) :
   thermo_virial = 1;
 
   // store ID of compute pe/atom used to generate Coulomb potential for LATTE
-  // nullptr means LATTE will compute Coulombic potential
+  // null pointer means LATTE will compute Coulombic potential
 
   coulomb = 0;
   id_pe = nullptr;

src/MISC/dump_xtc.cpp

@@ -137,7 +137,7 @@ void DumpXTC::init_style()
 void DumpXTC::openfile()
 {
   // XTC maintains it's own XDR file ptr
-  // set fp to nullptr so parent dump class will not use it
+  // set fp to a null pointer so parent dump class will not use it
 
   fp = nullptr;
   if (me == 0)

src/USER-DPD/pair_multi_lucy.cpp

@@ -582,7 +582,7 @@ void PairMultiLucy::compute_table(Table *tb)
 }
 
 /* ----------------------------------------------------------------------
-   set all ptrs in a table to nullptr, so can be freed safely
+   set all ptrs in a table to a null pointer, so can be freed safely
 ------------------------------------------------------------------------- */
 
 void PairMultiLucy::null_table(Table *tb)

src/USER-DPD/pair_multi_lucy_rx.cpp

@@ -727,7 +727,7 @@ void PairMultiLucyRX::compute_table(Table *tb)
 }
 
 /* ----------------------------------------------------------------------
-   set all ptrs in a table to nullptr, so can be freed safely
+   set all ptrs in a table to a null pointer, so can be freed safely
 ------------------------------------------------------------------------- */
 
 void PairMultiLucyRX::null_table(Table *tb)

src/USER-PHONON/fix_phonon.cpp

@@ -162,7 +162,7 @@ FixPhonon::FixPhonon(LAMMPS *lmp,  int narg, char **arg) : Fix(lmp, narg, arg)
   fft = new FFT3d(lmp,world,nz,ny,nx,0,nz-1,0,ny-1,nxlo,nxhi,0,nz-1,0,ny-1,nxlo,nxhi,0,0,&mysize,0);
   memory->create(fft_data, MAX(1,mynq)*2, "fix_phonon:fft_data");
 
-  // allocate variables; MAX(1,... is used because nullptr buffer will result in error for MPI
+  // allocate variables; MAX(1,... is used because a null buffer will result in error for MPI
   memory->create(RIloc,ngroup,(sysdim+1),"fix_phonon:RIloc");
   memory->create(RIall,ngroup,(sysdim+1),"fix_phonon:RIall");
   memory->create(Rsort,ngroup, sysdim, "fix_phonon:Rsort");

src/atom.cpp

@@ -2201,10 +2201,10 @@ void Atom::add_callback(int flag)
   int ifix;
 
   // find the fix
-  // if find nullptr:
+  // if find null pointer:
   //   it's this one, since it is being replaced and has just been deleted
   //   at this point in re-creation
-  // if don't find nullptr:
+  // if don't find null pointer:
   //   i is set to nfix = new one currently being added at end of list
 
   for (ifix = 0; ifix < modify->nfix; ifix++)

src/atom.h

@@ -55,7 +55,7 @@ class Atom : protected Pointers {
 
   int firstgroup;               // store atoms in this group first, -1 if unset
   int nfirst;                   // # of atoms in first group on this proc
-  char *firstgroupname;         // group-ID to store first, nullptr if unset
+  char *firstgroupname;         // group-ID to store first, null pointer if unset
 
   // --------------------------------------------------------------------
   // 1st customization section: customize by adding new per-atom variable

src/comm.cpp

@@ -888,7 +888,7 @@ rendezvous_irregular(int n, char *inbuf, int insize, int inorder, int *procs,
   if (inorder) nrvous = irregular->create_data_grouped(n,procs);
   else nrvous = irregular->create_data(n,procs);
 
-  // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+  // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
   char *inbuf_rvous = (char *) memory->smalloc((bigint) nrvous*insize+1,
                                                "rendezvous:inbuf");
@@ -925,7 +925,7 @@ rendezvous_irregular(int n, char *inbuf, int insize, int inorder, int *procs,
     nout = irregular->create_data_grouped(nrvous_out,procs_rvous);
   else nout = irregular->create_data(nrvous_out,procs_rvous);
 
-  // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+  // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
   outbuf = (char *) memory->smalloc((bigint) nout*outsize+1,
                                     "rendezvous:outbuf");
@@ -967,7 +967,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
   if (!inorder) {
     memory->create(procs_a2a,nprocs,"rendezvous:procs");
 
-    // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+    // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
     inbuf_a2a = (char *) memory->smalloc((bigint) n*insize+1,
                                          "rendezvous:inbuf");
@@ -1032,7 +1032,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
   }
 
   // all2all comm of inbuf from caller decomp to rendezvous decomp
-  // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+  // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
   char *inbuf_rvous = (char *) memory->smalloc((bigint) nrvous*insize+1,
                                                "rendezvous:inbuf");
@@ -1074,7 +1074,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
   if (!outorder) {
     memory->create(procs_a2a,nprocs,"rendezvous_a2a:procs");
 
-    // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+    // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
     outbuf_a2a = (char *) memory->smalloc((bigint) nrvous_out*outsize+1,
                                           "rendezvous:outbuf");
@@ -1135,7 +1135,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
 
   // all2all comm of outbuf from rendezvous decomp back to caller decomp
   // caller will free outbuf
-  // add 1 item to the allocated buffer size, so the returned pointer is not nullptr
+  // add 1 item to the allocated buffer size, so the returned pointer is not a null pointer
 
   outbuf = (char *) memory->smalloc((bigint) nout*outsize+1,"rendezvous:outbuf");
 

src/compute_chunk_atom.h

@@ -96,7 +96,7 @@ class ComputeChunkAtom : public Compute {
   class FixStore *fixstore;
 
   class Fix *lockfix;         // ptr to FixAveChunk that is locking out setups
-                              // nullptr if no lock currently in place
+                              // null pointer if no lock currently in place
   bigint lockstart,lockstop;  // timesteps for start and stop of locking
 
   bigint invoked_setup;    // last timestep setup_chunks and nchunk calculated

src/dump.cpp

@@ -202,7 +202,7 @@ Dump::~Dump()
     delete[] nameslist;
   }
 
-  // XTC style sets fp to nullptr since it closes file in its destructor
+  // XTC style sets fp to a null pointer since it closes file in its destructor
 
   if (multifile == 0 && fp != nullptr) {
     if (compressed) {

src/error.cpp

@@ -69,7 +69,7 @@ void Error::universe_all(const std::string &file, int line, const std::string &s
 #ifdef LAMMPS_EXCEPTIONS
 
   // allow commands if an exception was caught in a run
-  // update may be nullptr when catching command line errors
+  // update may be a null pointer when catching command line errors
 
   if (update) update->whichflag = 0;
 
@@ -95,7 +95,7 @@ void Error::universe_one(const std::string &file, int line, const std::string &s
 #ifdef LAMMPS_EXCEPTIONS
 
   // allow commands if an exception was caught in a run
-  // update may be nullptr when catching command line errors
+  // update may be a null pointer when catching command line errors
 
   if (update) update->whichflag = 0;
 
@@ -143,7 +143,7 @@ void Error::all(const std::string &file, int line, const std::string &str)
 #ifdef LAMMPS_EXCEPTIONS
 
   // allow commands if an exception was caught in a run
-  // update may be nullptr when catching command line errors
+  // update may be a null pointer when catching command line errors
 
   if (update) update->whichflag = 0;
 
@@ -192,7 +192,7 @@ void Error::one(const std::string &file, int line, const std::string &str)
 #ifdef LAMMPS_EXCEPTIONS
 
   // allow commands if an exception was caught in a run
-  // update may be nullptr when catching command line errors
+  // update may be a null pointer when catching command line errors
 
   if (update) update->whichflag = 0;
 

src/fix_property_atom.cpp

@@ -152,7 +152,7 @@ FixPropertyAtom::~FixPropertyAtom()
   if (border) atom->delete_callback(id,2);
 
   // deallocate per-atom vectors in Atom class
-  // set ptrs to nullptr, so they no longer exist for Atom class
+  // set ptrs to a null pointer, so they no longer exist for Atom class
 
   for (int m = 0; m < nvalue; m++) {
     if (style[m] == MOLECULE) {

src/input.cpp

@@ -338,7 +338,7 @@ char *Input::one(const std::string &single)
   }
 
   // parse the line
-  // if no command, just return nullptr
+  // if no command, just return a null pointer
 
   parse();
   if (command == nullptr) return nullptr;
@@ -450,7 +450,7 @@ void Input::parse()
    treat text between single/double/triple quotes as one arg
    matching quote must be followed by whitespace char if not end of string
    strip quotes from returned word
-   return ptr to start of word or nullptr if no word in string
+   return ptr to start of word or null pointer if no word in string
    also return next = ptr after word
 ------------------------------------------------------------------------- */
 

src/modify.cpp

@@ -821,7 +821,7 @@ void Modify::add_fix(int narg, char **arg, int trysuffix)
   //   warn if new group != old group
   //   delete old fix, but do not call update_callback(),
   //     since will replace this fix and thus other fix locs will not change
-  //   set ptr to nullptr in case new fix scans list of fixes,
+  //   set ptr to a null pointer in case new fix scans list of fixes,
   //     e.g. scan will occur in add_callback() if called by new fix
   // if fix ID does not exist:
   //   set newflag = 1 so create new fix

src/neighbor.cpp

@@ -378,7 +378,7 @@ void Neighbor::init()
   // We cannot remove special neighbors with kspace or kspace-like pair styles
   // as the exclusion needs to remove the full coulomb and not the damped interaction.
   // Special treatment is required for hybrid pair styles since Force::pair_match()
-  // will only return a non-nullptr pointer if there is only one substyle of the kind.
+  // will only return a non-null pointer if there is only one substyle of the kind.
 
   if (force->kspace) {
     special_flag[1] = special_flag[2] = special_flag[3] = 2;

src/output.h

@@ -29,7 +29,7 @@ class Output : protected Pointers {
   bigint next_thermo;          // next timestep for thermo output
   int thermo_every;            // output freq for thermo, 0 if first/last only
   bigint last_thermo;          // last timestep thermo was output
-  char *var_thermo;            // variable name for thermo freq, nullptr if every
+  char *var_thermo;            // variable name for thermo freq, null pointer if every
   int ivar_thermo;             // variable index for thermo frequency
   class Thermo *thermo;        // Thermodynamic computations
 

src/pair_table.cpp

@@ -821,7 +821,7 @@ void PairTable::compute_table(Table *tb)
 }
 
 /* ----------------------------------------------------------------------
-   set all ptrs in a table to nullptr, so can be freed safely
+   set all ptrs in a table to a null pointer, so can be freed safely
 ------------------------------------------------------------------------- */
 
 void PairTable::null_table(Table *tb)

src/read_dump.cpp

@@ -713,7 +713,7 @@ void ReadDump::read_atoms()
 
       if (nnew > maxnew || maxnew == 0) {
         memory->destroy(fields);
-        maxnew = MAX(nnew,1);    // avoid nullptr
+        maxnew = MAX(nnew,1);    // avoid null pointer
         memory->create(fields,maxnew,nfield,"read_dump:fields");
       }
 
@@ -753,7 +753,7 @@ void ReadDump::read_atoms()
       nnew = static_cast<int> (olast - ofirst);
       if (nnew > maxnew || maxnew == 0) {
         memory->destroy(fields);
-        maxnew = MAX(nnew,1);     // avoid nullptr
+        maxnew = MAX(nnew,1);     // avoid null pointer
         memory->create(fields,maxnew,nfield,"read_dump:fields");
       }
 
@@ -779,7 +779,7 @@ void ReadDump::read_atoms()
     nnew = static_cast<int> (sum);
     if (nnew > maxnew || maxnew == 0) {
       memory->destroy(fields);
-      maxnew = MAX(nnew,1);     // avoid nullptr
+      maxnew = MAX(nnew,1);     // avoid null pointer
       memory->create(fields,maxnew,nfield,"read_dump:fields");
     }
 
@@ -1105,7 +1105,7 @@ void ReadDump::migrate_new_atoms()
   Irregular *irregular = new Irregular(lmp);
   int nrecv = irregular->create_data(nnew,procassign,1);
   int newmaxnew = MAX(nrecv,maxnew);
-  newmaxnew = MAX(newmaxnew,1);    // avoid nullptr
+  newmaxnew = MAX(newmaxnew,1);    // avoid null pointer
   memory->create(newfields,newmaxnew,nfield,"read_dump:newfields");
   irregular->exchange_data((char *) &fields[0][0],nfield*sizeof(double),
                            (char *) &newfields[0][0]);

src/utils.cpp

@@ -171,7 +171,7 @@ void utils::sfgets(const char *srcname, int srcline, char *s, int size,
     errmsg += "'";
 
     if (error) error->one(srcname,srcline,errmsg);
-    if (s) *s = '\0'; // truncate string to empty in case error is nullptr
+    if (s) *s = '\0'; // truncate string to empty in case error is null pointer
   }
   return;
 }

src/utils.h

@@ -60,7 +60,7 @@ namespace LAMMPS_NS {
      *  \param s        buffer for storing the result of fgets()
      *  \param size     size of buffer s (max number of bytes read by fgets())
      *  \param fp       file pointer used by fgets()
-     *  \param filename file name associated with fp (may be nullptr; then LAMMPS will try to detect)
+     *  \param filename file name associated with fp (may be a null pointer; then LAMMPS will try to detect)
      *  \param error    pointer to Error class instance (for abort) */
 
     void sfgets(const char *srcname, int srcline, char *s, int size,
@@ -75,7 +75,7 @@ namespace LAMMPS_NS {
      *  \param size     size of data elements read by fread()
      *  \param num      number of data elements read by fread()
      *  \param fp       file pointer used by fread()
-     *  \param filename file name associated with fp (may be nullptr; then LAMMPS will try to detect)
+     *  \param filename file name associated with fp (may be a null pointer; then LAMMPS will try to detect)
      *  \param error    pointer to Error class instance (for abort) */
 
     void sfread(const char *srcname, int srcline, void *s, size_t size,