PetscOptionsBool#

Determines if a particular option is in the database with a true or false

Synopsis#

#include <petscoptions.h>
PetscErrorCode PetscOptionsBool(const char opt[], const char text[], const char man[], PetscBool currentvalue, PetscBool *flg, 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
currentvalue - the current value

Output Parameters#

flg - PETSC_TRUE or PETSC_FALSE
set - PETSC_TRUE if found, else PETSC_FALSE

Notes#

TRUE, true, YES, yes, nostring, and 1 all translate to PETSC_TRUE FALSE, false, NO, no, and 0 all translate to PETSC_FALSE

If the option is given, but no value is provided, then flg and set are both given the value PETSC_TRUE. That is -requested_bool is equivalent to -requested_bool true

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

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