## 12.8.8. User Defined Functions

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`typedef int MPI::Comm::Copy_attr_function(const MPI::Comm& oldcomm, int comm_keyval, void* extra_state, void* attribute_val_in, void* attribute_val_out, bool& flag);
` `typedef int MPI::Comm::Delete_attr_function(MPI::Comm& comm, int comm_keyval, void* attribute_val, void* extra_state);
` `typedef void MPI::Comm::Errhandler_fn(MPI::Comm &, int *, ... );
` `typedef MPI::Datarep_conversion_function(void* userbuf, MPI::Datatype& datatype, int count, void* filebuf, MPI::Offset position, void* extra_state);
` `typedef MPI::Datarep_extent_function(const MPI::Datatype& datatype, MPI::Aint& file_extent, void* extra_state);
` `typedef int MPI::Datatype::Copy_attr_function(const MPI::Datatype& oldtype, int type_keyval, void* extra_state, const void* attribute_val_in, void* attribute_val_out, bool& flag);
` `typedef int MPI::Datatype::Delete_attr_function(MPI::Datatype& type, int type_keyval, void* attribute_val, void* extra_state);
` `typedef void MPI::File::Errhandler_fn(MPI::File &, int *, ... );
` `typedef int MPI::Grequest::Cancel_function(void* extra_state, bool complete);
` `typedef int MPI::Grequest::Free_function(void* extra_state);
` `typedef int MPI::Grequest::Query_function(void* extra_state, MPI::Status& status);
` `typedef int MPI::Win::Copy_attr_function(const MPI::Win& oldwin, int win_keyval, void* extra_state, void* attribute_val_in, void* attribute_val_out, bool& flag);
` `typedef int MPI::Win::Delete_attr_function(MPI::Win& win, int win_keyval, void* attribute_val, void* extra_state);
` `typedef void MPI::Win::Errhandler_fn(MPI::Win &, int *, ... );
`

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MPI-2.0 of July 18, 1997
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