MPI_Data_type - Defines C and Fortran data types
STANDARDS
       This release implements the MPI 1.2 standard, as
       documented by the MPI Forum in the spring 1997 release of
       MPI:  A Message Passing Interface Standard.
DESCRIPTION
       The MPI_Data_type routine defines special data types for
       both C and Fortran and data types of type MPI_Datatype for
       C programs and of type integer for Fortran programs.  The
       C types should be used only in C programs and the Fortran
       types should be used only in Fortran programs.  For
       example, it is an error to use MPI_INT for a Fortran
       integer.
   Special Data Types
       The following data types can be used in C or Fortran
       programs:
       MPI_PACKED               Used for the  MPI_Pack(3) and
                                MPI_Unpack(3) routines
       MPI_UB                   Used for the MPI_Type_struct(3)
                                routine (an upper-bound
                                indicator)
       MPI_LB                   Used for the MPI_Type_struct(3)
                                routine (a lower-bound indicator)
   C Data Types
       The following data types can be used in all C programs:
       MPI_CHAR                 Specifies char
       MPI_BYTE                 Specifies unsigned char (see the
                                standard)
       MPI_SHORT                Specifies short
       MPI_INT                  Specifies int
       MPI_LONG                 Specifies long
       MPI_FLOAT                Specifies float
       MPI_DOUBLE               Specifies double
       MPI_UNSIGNED_CHAR        Specifies unsigned char
       MPI_UNSIGNED_SHORT       Specifies unsigned short
       MPI_UNSIGNED             Specifies unsigned int
       MPI_LONG_DOUBLE          Specifies long double (some
                                systems may not implement)
       The following data types can be used for the MPI functions
       MPI_MAXLOC and MPI_MINLOC:
       MPI_FLOAT_INT            Specifies struct { float, int }
       MPI_LONG_INT             Specifies struct { long, int }
       MPI_DOUBLE_INT           Specifies struct { double, int }
       MPI_SHORT_INT            Specifies struct { short, int }
       MPI_2INT                 Specifies struct { int, int }
       MPI_LONG_DOUBLE_INT      Specifies struct { long double,
                                int } (this is an optional type
                                and can be set to NULL)
       MPI_LONG_LONG_INT        Specifies struct { long long, int
                                } (this is an optional type and
                                can be set to NULL)
   Fortran Data Types
       The following data types can be used in all Fortran
       programs:
       MPI_REAL                 Specifies REAL
       MPI_INTEGER              Specifies INTEGER
       MPI_LOGICAL              Specifies LOGICAL
       MPI_DOUBLE_PRECISION     Specifies DOUBLE PRECISION
       MPI_COMPLEX              Specifies COMPLEX
       MPI_DOUBLE_COMPLEX       Specifies COMPLEX*16 (or
                                COMPLEX*32) where supported
       The following data types are optional:
       MPI_INTEGER1             Specifies INTEGER*1 if supported
       MPI_INTEGER2             Specifies INTEGER*2 if supported
       MPI_INTEGER4             Specifies INTEGER*4 if supported
       MPI_REAL4                Specifies REAL*4 if supported
       MPI_REAL8                Specifies REAL*8 if supported
       MPI_MAXLOC and MPI_MINLOC.  In Fortran, these data types
       always consist of two elements of the same Fortran type.
       MPI_2INTEGER                  Specifies INTEGER, INTEGER
       MPI_2REAL                     Specifies REAL, REAL
       MPI_2DOUBLE_PRECISION         Specifies DOUBLE PRECISION,
                                     DOUBLE PRECISION
       MPI_2COMPLEX                  Specifies COMPLEX, COMPLEX
       MPI_2DOUBLE_COMPLEX           Specifies COMPLEX*16,
                                     COMPLEX*16
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