.. _mpi_t_category_get_pvars:


MPI_T_category_get_pvars
========================

.. include_body

:ref:`MPI_T_category_get_pvars` |mdash| Query which performance variables are in
a category

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.. include:: ./bindings/mpi_t_category_get_pvars.rst

INPUT PARAMETERS
----------------
* ``cat_index``: Index of the category to be queried.
* ``len``: The length of the indices array.

OUTPUT PARAMETERS
-----------------
* ``indices``: An integer array of size len, indicating performance variable indices.

DESCRIPTION
-----------

:ref:`MPI_T_category_get_pvars` can be used to query which performance
variables are contained in a particular category. A category contains
zero or more performance variables.


ERRORS
------

:ref:`MPI_T_category_get_pvars` will fail if:

* ``MPI_T_ERR_NOT_INITIALIZED``: The MPI Tools interface not initialized

* ``MPI_T_ERR_INVALID_INDEX``: The category index is invalid