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This manages the whole MPI Environment and the first constructed instance is responsible for calling MPI_Init and MPI_Finalize.
MPI_Init
MPI_Finalize
It must be constructed near the start of program execution and destructed near the end.
Constructing/destructing other instances has no effect.
It offers Initialized and Finalized methods equivalent to MPI_Initialized/MPI_Finalized.
Initialized
Finalized
MPI_Initialized
MPI_Finalized