No, they have different sizes. I use all_gather, but I must iterate over each element in the result vector and put the elements into a new vector. I do this at the time:

std::vector< std::vector<std::string> > result;

mpi::all_gather( mpi object, vec, result);

std::vector<std::string> myvec;

foreach( result as res )

     myvec.push_back( foreach in res );

I need the loop after all_gather and my question is: Can I do the loop call into the mpi command, so that I don't have a loop after the gather?

Thx

Phil