4.7. Committing a Committed Datatype
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In MPI-1.2, the effect of calling MPI_TYPE_COMMIT with a datatype that is already committed is not specified. For MPI-2, it is specified that MPI_TYPE_COMMIT will accept a committed datatype; in this case, it is equivalent to a no-op.
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MPI-2.0 of July 18, 1997
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