Allow driver to cleanup context if it owns the last shared pointer

Author: langmm

src/Variables.cpp

@@ -46,7 +46,6 @@ Variables::Variables(SUNContext* ctx, const int flags) :
   _context(), _context_flags(flags) {
     if (_context == nullptr) {
         if (flags & CONTEXT_FLAG_GLOBAL) {
-            std::cerr << "Using global context" << std::endl;
             init_global_sundials_context();
             _context = global_context;
             _context_flags |= CONTEXT_FLAG_GLOBAL;

src/drivers/driver.cpp

@@ -164,6 +164,9 @@ Driver::~Driver() {
     cmem = &CVodeMem::create();
     cmem->cvode_mem_free();
     cvode_mem = nullptr;
+    if (_context.use_count() == 1)
+        SUNContext_Free(_context.get());
+    _context.reset();
 }
 
 int Driver::calculate(realtype t, N_Vector u, N_Vector u_dot, void *user_data) {

tests/python/test_drivers.py

@@ -48,7 +48,6 @@ def wrapped_driver_vars(driver):
         x = Variables()
         x.readParam(fname_InputEvn)
         if driver == "EPS":
-            # x.useC3 = True
             x.readParam(fname_InputATPCost)
             x.readEnzymeAct(fname_InputEnzyme)
             x.readGRN(fname_InputGRNC)