PetscOptionsEnum#

Gets the enum value for a particular option in the database.

Synopsis#

#include <petscoptions.h>
PetscErrorCode PetscOptionsEnum(const char opt[], const char text[], const char man[], const char *const *list, PetscEnum currentvalue, PetscEnum *value, PetscBool *set)

Logically Collective on the communicator passed in PetscOptionsBegin()

Input Parameters#

opt - option name
text - short string that describes the option
man - manual page with additional information on option
list - array containing the list of choices, followed by the enum name, followed by the enum prefix, followed by a null
currentvalue - the current value; caller is responsible for setting this value correctly. Normally this is done with either

                 PetscOptionsEnum(..., obj->value,&object->value,...) or
                 value = defaultvalue
                 PetscOptionsEnum(..., value,&value,&set);
                 if (set) {

Output Parameters#

value - the value to return
set - PETSC_TRUE if found, else PETSC_FALSE

Notes#

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

list is usually something like PCASMTypes or some other predefined list of enum names

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 that set is PETSC_TRUE.

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