sendrecv.cc
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			#include <assert.h>
			#include <iostream>
			#include <mpi.h>
			#include <vector>

			void fill_buffer(std::vector<int> &buf, rank) {
			for (auto &v : buf) {
			v = 0;
			}
			}

			int main() {
			int rank, size;
			std::vector<int> buf(100);

			MPI_Init(NULL, NULL);
			MPI_Comm_rank(MPI_COMM_WORLD, &rank);
			MPI_Comm_size(MPI_COMM_WORLD, &size);

			assert(size == 2 && "Works only with 2 procs");

			fill_buffer(buf, rank);
			MPI_Sendrecv(buf.data(), buf.size(), MPI_INT, 1, 0, buf.data(), buf.size(),
			MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);

			MPI_Finalize();

			return 0;
			}

R11821/examples/mpi/sendrecv.cc5e5fb21202c1master