test for exceptions add example

Retrieving LAMMPS configuration information

===========================================

The following library functions can be used to query the

LAMMPS library about compile time settings and included

packages and styles.

The following library functions can be used to query the LAMMPS library

about compile time settings and included packages and styles.  This

enables programs that use the library interface to run LAMMPS

simulations to determine, whether the linked LAMMPS library is compatible

with the requirements of the application without crashing during the

LAMMPS functions (e.g. due to missing pair styles from packages) or to

choose between different options (e.g. whether to use ``lj/cut``,

``lj/cut/opt``, ``lj/cut/omp`` or ``lj/cut/intel``).  Most of the

functions can be called directly without first creating a LAMMPS

instance.  While crashes within LAMMPS may be recovered from through

enabling :ref:`exceptions <exceptions>`, avoiding them proactively is

a safer approach.

.. code-block:: C

   :caption: Handle errors using a LAMMPS library with exceptions

   #include "library.h"

   #include <stdio.h>

   int main(int argc, char **argv)

   {

     void *handle;

     handle = lammps_open_no_mpi(0, NULL, NULL);

     lammps_file(handle, "in.missing");

     if (lammps_has_error(handle)) {

       char errmsg[256];

       int errtype;

       errtype = lammps_get_last_error_message(handle, errmsg, 256);

       fprintf(stderr, "LAMMPS failed with error: %s\n", errmsg);

       return 1;

     }

     lammps_close(handle);

     return 0;

   }

-----------------------

endif()

list(APPEND TEST_CONFIG_DEFS -DLAMMPS_HAS_MPI=${HAS_MPI})

if(LAMMPS_EXCEPTION)

  set(HAS_EXCEPTIONS 1)

else()

  set(HAS_EXCEPTIONS 0)

endif()

list(APPEND TEST_CONFIG_DEFS -DLAMMPS_HAS_EXCEPTIONS=${HAS_EXCEPTIONS})

foreach(WITH "JPEG" "PNG" "GZIP" "FFMPEG")

  if(WITH_${WITH})

    set(HAS_${WITH} 1)

    EXPECT_THAT(buf, StrEq(""));

};

TEST(LAMMPSConfig, exceptions)

{

    EXPECT_EQ(lammps_config_has_exceptions(), LAMMPS_HAS_EXCEPTIONS);

};

TEST(LAMMPSConfig, mpi_support)

{

    EXPECT_EQ(lammps_config_has_mpi_support(), LAMMPS_HAS_MPI);