PetscOptionsInt#

Gets the integer value for a particular option in the database. Logically Collective on the communicator passed in PetscOptionsBegin()

Synopsis#

#include "petscsys.h"
PetscErrorCode  PetscOptionsInt(const char opt[],const char text[],const char man[],PetscInt currentvalue,PetscInt *value,PetscBool *flg))

Input Parameters#

opt - option name
text - short string that describes the option
man - manual page with additional information on option
currentvalue - the current value; caller is responsible for setting this value correctly. Normally this is done with either

PetscOptionsInt(..., obj->value,&obj->value,...) or

value = defaultvalue

PetscOptionsInt(..., value,&value,&flg);

if (flg) {

Output Parameters#

value - the integer value to return
flg - PETSC_TRUE if found, else PETSC_FALSE

Notes#

If the user does not supply the option at all value is NOT changed. Thus you should ALWAYS initialize value if you access it without first checking if the set flag is true.

The default/currentvalue passed into this routine does not get transferred to the output value variable automatically.

Must be between a PetscOptionsBegin() and a PetscOptionsEnd()