# 13.3. Typedefs

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The following are defined C++ types, also included in the file `mpi.h`.

    // Typedef
    MPI::Aint

The rest of this annex uses the `namespace` notation because all the functions listed below are prototypes. The `namespace` notation is not used previously because the lists of constants and types above are not actual declarations.

    // prototypes for user-defined functions
    namespace MPI {
      typedef void User_function(const void *invec, void* inoutvec, int len,
                                 const Datatype& datatype);
    };

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MPI-2.0 of July 18, 1997
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