Add pointer to TimeIntegratorTaskList to STSTaskList constructor

Stored in private variable.

Also, change the type of ptlist in main.cpp to TimeIntegratorTaskList*
from generic base class pointer TaskList* in order to pass it to the STS
constructor.

Author: felker

src/main.cpp

@@ -305,7 +305,7 @@ int main(int argc, char *argv[]) {
   //--- Step 5. --------------------------------------------------------------------------
   // Construct and initialize TaskList
 
-  TaskList *ptlist;
+  TimeIntegratorTaskList *ptlist;
 #ifdef ENABLE_EXCEPTIONS
   try {
 #endif
@@ -327,7 +327,7 @@ int main(int argc, char *argv[]) {
 #ifdef ENABLE_EXCEPTIONS
     try {
 #endif
-      pststlist = new SuperTimeStepTaskList(pinput, pmesh);
+      pststlist = new SuperTimeStepTaskList(pinput, pmesh, ptlist);
 #ifdef ENABLE_EXCEPTIONS
     }
     catch(std::bad_alloc& ba) {

src/task_list/sts_task_list.cpp

@@ -37,8 +37,9 @@
 //----------------------------------------------------------------------------------------
 //  SuperTimeStepTaskList constructor
 
-SuperTimeStepTaskList::SuperTimeStepTaskList(ParameterInput *pin, Mesh *pm)
-    : TaskList(pm) {
+SuperTimeStepTaskList::SuperTimeStepTaskList(ParameterInput *pin, Mesh *pm,
+                                             TimeIntegratorTaskList *ptlist)
+    : TaskList(pm), ptlist_(ptlist) {
   // STS Incompatiblities
   if (MAGNETIC_FIELDS_ENABLED &&
       !(pm->pblock->pfield->pfdif->field_diffusion_defined) &&

src/task_list/task_list.hpp

@@ -160,7 +160,7 @@ class TimeIntegratorTaskList : public TaskList {
 
 class SuperTimeStepTaskList : public TaskList {
  public:
-  SuperTimeStepTaskList(ParameterInput *pin, Mesh *pm);
+  SuperTimeStepTaskList(ParameterInput *pin, Mesh *pm, TimeIntegratorTaskList *ptlist);
   ~SuperTimeStepTaskList() {}
 
   // functions
@@ -193,6 +193,7 @@ class SuperTimeStepTaskList : public TaskList {
   enum TaskStatus PhysicalBoundary_STS(MeshBlock *pmb, int stage);
 
  private:
+  TimeIntegratorTaskList *ptlist_;
   void AddTask(std::uint64_t id, std::uint64_t dep) override;
   void StartupTaskList(MeshBlock *pmb, int stage) override;
 };