static char help[] = "Tests PetscArraymove()/PetscMemmove()\n";

#include <petscsys.h>

int main(int argc, char **argv)
{
  PetscInt i, *a, *b;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &argv, NULL, help));

  PetscCall(PetscMalloc1(10, &a));
  PetscCall(PetscMalloc1(20, &b));

  /*
      Nonoverlapping regions
  */
  for (i = 0; i < 20; i++) b[i] = i;
  PetscCall(PetscArraymove(a, b, 10));
  PetscCall(PetscIntView(10, a, NULL));

  PetscCall(PetscFree(a));

  /*
     |        |                |       |
     b        a               b+15    b+20
                              a+10    a+15
  */
  a = b + 5;
  PetscCall(PetscArraymove(a, b, 15));
  PetscCall(PetscIntView(15, a, NULL));
  PetscCall(PetscFree(b));

  /*
     |       |                    |       |
     a       b                   a+20   a+25
                                        b+20
  */
  PetscCall(PetscMalloc1(25, &a));
  b = a + 5;
  for (i = 0; i < 20; i++) b[i] = i;
  PetscCall(PetscArraymove(a, b, 20));
  PetscCall(PetscIntView(20, a, NULL));
  PetscCall(PetscFree(a));

  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:

TEST*/