class_handle.h

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//                                class_handle.h
//                 DARMA/comm => Communicator
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#if !defined INCLUDED_COMM_COMM_CLASS_HANDLE_H
#define INCLUDED_COMM_COMM_CLASS_HANDLE_H
 
#include <mpi.h>
 
#include <unordered_map>
#include <vector>
 
namespace comm {
 
struct CommMPI;
 
template <typename T>
struct ClassHandle;
 
template <typename T>
struct ClassHandleRank {
  ClassHandleRank(ClassHandle<T> in_handle, int in_rank);
 
  template <auto fn, typename... Args>
  void send(Args&&... args);
 
  template <auto fn, typename... Args>
  void sendTerm(Args&&... args);
 
private:
  ClassHandle<T> handle_;
  int rank_ = -1;
};
 
template <typename T>
struct ClassHandle {
  ClassHandle() = default;
  ClassHandle(int in_index, CommMPI* in_comm);
  ClassHandle(ClassHandle const&) = default;
  ClassHandle& operator=(ClassHandle const&) = default;
 
  void unregister();
  T* get();
  ClassHandleRank<T> operator[](int rank);
 
  template <auto fn, typename... Args>
  void send(int dest, Args&&... args);
 
  template <auto fn, typename... Args>
  void sendTerm(int dest, Args&&... args);
 
  template <typename U, typename V>
  void reduce(int root, MPI_Datatype datatype, MPI_Op op, U sendbuf, V recvbuf, int count);
 
  template <typename U>
  void broadcast(int root, MPI_Datatype datatype, U buffer, int count);
 
  template <typename U>
  std::unordered_map<int, std::vector<U>> allgather(U const* sendbuf, int sendcount);
 
  friend struct ClassHandleRank<T>;
 
  int getIndex() const { return index_; }
 
private:
  int index_ = 0;
  CommMPI* comm_;
};
 
} // namespace comm
 
#endif /*INCLUDED_COMM_COMM_CLASS_HANDLE_H*/