controller: get_finest & get_coarsest

new handy accessor methods for the finest and coarses level hold by a
controller

Author: torbjoernk

examples/advection_diffusion/serial_mlsdc.cpp

@@ -63,7 +63,7 @@ int main(int argc, char** argv)
   /*
    * set initial conditions on each level
    */
-  auto sweeper = mlsdc.finest().operator-><AdvectionDiffusionSweeper<>>();
+  auto sweeper = mlsdc.get_finest<AdvectionDiffusionSweeper<>>();
   auto q0 = sweeper->get_state(0);
   sweeper->exact(q0, 0.0);
 

include/pfasst/controller.hpp

@@ -68,6 +68,22 @@ namespace pfasst
         return r;
       }
 
+      template<typename R = ISweeper<time>>
+      shared_ptr<R> get_finest()
+      {
+        shared_ptr<R> r = dynamic_pointer_cast<R>(levels.back());
+        assert(r);
+        return r;
+      }
+
+      template<typename R = ISweeper<time>>
+      shared_ptr<R> get_coarsest()
+      {
+        shared_ptr<R> r = dynamic_pointer_cast<R>(levels.front());
+        assert(r);
+        return r;
+      }
+
       template<typename R = ITransfer<time>>
       shared_ptr<R> get_transfer(size_t level)
       {