Delete transfer operators

src/one-body-sample.cc

@@ -369,8 +369,9 @@ int main(int argc, char *argv[]) {
         delete linearBaseSolver;
         delete linearPresmoother;
         delete linearPostsmoother;
+        for (auto &x : transfer_)
+          delete x;
         delete linearIterationStep;
-        // TODO: handle transfer operators
         delete myBlockProblem;
         delete nonlinearSmoother;
         delete multigridStep;