idk

lab11/game_of_life/super_grid.h

@@ -2,6 +2,7 @@
 #define SUPER_GRID_H
 
 #include "matrix.h"
+#include <cstdio>
 #include <mpi.h>
 
 class SuperGrid {
@@ -75,4 +76,13 @@ inline void SuperGrid::set_communicator(MPI_Comm communicator) {
   this->comm_ = communicator;
 }
 
+inline void SuperGrid::find_neighbors() {
+  int left, right;
+  int top, bottom;
+  MPI_Cart_shift(this->comm_, 0, 1, &left, &right);
+  MPI_Cart_shift(this->comm_, 0, 1, &top, &bottom);
+
+  printf("left: %d, right: %d \ntop: %d, bottom: %d", left, right, top, bottom);
+}
+
 #endif // SUPER_GRID_H

lab11/game_of_life/test.cpp

@@ -72,4 +72,21 @@ TEST(test_super_grid) {
   check(su_grid.cols(), 10);
 }
 
-int main() { return 0; }
+TEST(test_find_neighbors) {
+  int a;
+  char *b[10];
+  MPI_Init(&a, nullptr);
+
+  MPI_Comm comm_;
+  MPIGridSize mpiProcs = {0, 0};
+
+  std::array<int, 2> periods = {1, 1};
+  MPI_Cart_create(MPI_COMM_WORLD, 2, mpiProcs.data(), periods.data(), true,
+                  &comm_);
+
+  SuperGrid su_grid = SuperGrid::zeros(10, 10, nullptr);
+  su_grid.find_neighbors();
+  MPI_Finalize();
+}
+
+int main(int argc, char *argv[]) { return 0; }