Re: [boost] [mpi] BOOST_HAS_LONG_LONG but no is_mpi_datatype<long long>

From: Matthias Troyer (troyer_at_[hidden])
Date: 2008-03-12 23:52:08

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
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