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  1. #include <cmath>
  2. #include <mpi.h>
  3.  
  4. class mpi {
  5. public:
  6.     static void init(int argc, char** argv) {
  7.         MPI_Init(&argc, &argv);
  8.  
  9.         MPI_Comm_rank(MPI_COMM_WORLD, &m_rank);
  10.         MPI_Comm_size(MPI_COMM_WORLD, &m_size);
  11.     }
  12.  
  13.     static void finalize() {
  14.         MPI_Finalize();
  15.     }
  16.  
  17.     static int rank() noexcept { return m_rank; }
  18.     static int size() noexcept { return m_size; }
  19.  
  20.     static double min(double value) {
  21.         double global_min = 0.0;
  22.         MPI_Allreduce(&value, &global_min, 1, MPI_DOUBLE, MPI_MIN, MPI_COMM_WORLD);
  23.         return global_min;
  24.     }
  25.  
  26.     class master_stream  {
  27.     public:
  28.         template<class T>
  29.         master_stream &operator<<(const T &x) {
  30.             if (m_rank == 0)
  31.                 std::cout << x;
  32.             return *this;
  33.         }
  34.     };
  35.  
  36.     static inline master_stream cout{};
  37.     static inline char endl = '\n';
  38.  
  39. private:
  40.     mpi() = default;
  41.     static inline int m_rank = 0;
  42.     static inline int m_size = 1;
  43. };
  44.  
  45. int main(int argc, char** argv) {
  46.     mpi::init(argc, argv);
  47.  
  48.     double kek = cos(mpi::rank() + 10.0);
  49.  
  50.     mpi::cout << "Hello, I'm master process" << mpi::endl;
  51.     mpi::cout << "Min keks is " << mpi::min(kek) << mpi::endl;
  52.  
  53.     mpi::finalize();
  54.     return 0;
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:2:17: fatal error: mpi.h: No such file or directory
 #include <mpi.h>
                 ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/gy7JuT
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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