Update src/cart_cell.cc

use *Simulation::GetActive()->GetResourceManager() just once

Co-authored-by: Vassil Vassilev <[email protected]>

Author: salva24

src/cart_cell.cc

@@ -39,9 +39,10 @@ CartCell::CartCell(const Real3& position) {
 
 
   // Pointer to oxygen diffusion grid
-  oxygen_dgrid_ = Simulation::GetActive()->GetResourceManager()->GetDiffusionGrid("oxygen");
+  ResourseManager &rm = *Simulation::GetActive()->GetResourceManager();
+  oxygen_dgrid_ = rm.GetDiffusionGrid("oxygen");
   // Pointer to immunostimulatory_factor diffusion grid
-  immunostimulatory_factor_dgrid_ = Simulation::GetActive()->GetResourceManager()->GetDiffusionGrid("immunostimulatory_factor");
+  immunostimulatory_factor_dgrid_ = rm.GetDiffusionGrid("immunostimulatory_factor");
   // Initially not attached to a tumor cell
   attached_to_tumor_cell_ = false; 
   // Initialize attached cell pointer to null