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// Author: K. Noel Belcourt <kbelco -at- sandia.gov>
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#if defined(__cplusplus) && (201103L <= __cplusplus)
#include <array>
#include <cassert>
#include <vector>
#include "boost/mpi/environment.hpp"
#include "boost/mpi/communicator.hpp"
using std::array;
using std::vector;
namespace mpi = boost::mpi;
struct blob : array<int, 9>, array<double, 3>, array<char, 8> {
};
namespace boost {
namespace mpi {
template <>
struct is_mpi_datatype<blob> : mpl::true_ {
};
template <>
MPI_Datatype get_mpi_datatype<blob>(const blob& b) {
array<unsigned long, 3> block_lengths{
{ 9, 3, 8 }
};
array<MPI_Aint, 3> displacements{
{ 0, 40, 64 }
};
array<MPI_Datatype, 3> datatypes{
{ MPI_INT, MPI_DOUBLE, MPI_CHAR }
};
MPI_Datatype blob_type;
MPI_Type_create_struct(
block_lengths.size()
, reinterpret_cast<int*>(block_lengths.data())
, displacements.data()
, datatypes.data()
, &blob_type);
MPI_Type_commit(&blob_type);
return blob_type;
}
} // namespace mpi
} // namespace boost
#endif // defined(__cplusplus)
int main(int argc, char* argv[]) {
#if defined(__cplusplus) && (201103L <= __cplusplus)
mpi::environment env(argc, argv);
mpi::communicator world;
vector<blob> data;
if (world.rank() == 0) {
int size = 10000000;
data.resize(size);
// initialize data at vector ends
blob& b1= data[0];
array<int, 9>& i = b1;
i[0] = -1;
blob& b2= data[size-1];
array<int, 9>& d = b2;
d[2] = -17;
world.send(1, 0, data);
} else {
world.recv(0, 0, data);
// check data at vector ends
blob& b1 = data[0];
array<int, 9>& i = b1;
assert(i[0] == -1);
// blob& b2 = data[data.size()-1];
// array<int, 9>& d = b2;
// assert(d[2] == -17);
}
#endif // defined(__cplusplus)
return 0;
}
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