Basic datatypes were introduced
in Section Message Data
Message Data
on page Message Data
and
in Section Data Type Matching and Data Conversion
Data Type Matching and Data Conversion
on page Data Type Matching and Data Conversion
.
In this chapter, this model is
extended
to describe any data layout.
We consider general
datatypes that allow one to transfer efficiently
heterogeneous and noncontiguous data.
We conclude with the description of calls for explicit packing and unpacking of
messages.
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MPI-2.0 of July 1, 2008
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