[Dune] Weird behaviour of MPIHelper

[Aleksejs Fomins]

Dear Dune,

I am having trouble with very basic c++ pointer problem in my curvilinear grid. The file grid.hh contains 2 functions:

    const CollectiveCommunication &comm () const  { return mpihelper_.getCollectiveCommunication(); }

    MPIHelper & mpihelper()  const { return mpihelper_; }

One of them returns the MPIHelper reference, the other the CollectiveCommunication reference.


I write a test program:

Grid * grid = factory.createGrid();

std::cout << "rank v1 = " << grid->comm().rank() << std::endl;
std::cout << "rank v2 = " << grid->mpihelper().getCollectiveCommunication().rank() << std::endl;

the result for a serial run is
-1183734688
0

And the first result puzzles me a lot, as I expect it to be equal to the 2nd one. Otherwise, the grid is functioning well, so it is definitely initialized

Any ideas?

Greetings,
Aleksejs