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static void  | send (const T &value, int dst_worker_id, int tag, MPI_Comm comm) | 
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template<typename ITER_T >  | 
| static void  | multiple_send (const T &value, const ITER_T &worker_id_begin, const ITER_T &worker_id_end, int tag, MPI_Comm comm) | 
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static void  | recv (T &value, int src_worker_id, int tag, MPI_Comm comm) | 
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static void  | bcast (T &value, int root, MPI_Comm comm) | 
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