Hi, This is commented out because MPI_LONG_LONG_INT is not supported by all MPI implementations and thus leads to nonportable code. You can uncomment this if you are aware of that danger. Matthias On 26 Feb 2008, at 03:15, Number Cruncher wrote:

I'm trying to send a class with a uint64_t member and although my compiler (gcc 4.0.2), MPI library (OpenMPI 1.2.5) and boost library (SVN branches/release) all support "long long" natively on 32-bit i386, I noticed the necessary code is "#if 0" undefined in boost/mpi/ datatype.hpp

Just wondering why?

#if 0 #ifndef BOOST_NO_INTRINSIC_WCHAR_T BOOST_MPI_DATATYPE(wchar_t, MPI_WCHAR, builtin); #endif

#ifdef BOOST_HAS_LONG_LONG BOOST_MPI_DATATYPE(long long, MPI_LONG_LONG_INT, builtin); BOOST_MPI_DATATYPE(unsigned long long, MPI_UNSIGNED_LONG_LONG, builtin); #endif #endif

Cheers, Simon _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost