PetscOptionsGetBool

Gets the Logical (true or false) value for a particular option in the database.

Synopsis

#include "petscsys.h"   
PetscErrorCode PetscOptionsGetBool(PetscOptions options, const char pre[], const char name[], PetscBool *ivalue, PetscBool *set)

Not Collective

Input Parameters

• options - options database, use NULL for default global database

• pre - the string to prepend to the name or NULL

• name - the option one is seeking

Output Parameters

• ivalue - the logical value to return

• set - PETSC_TRUE if found, else PETSC_FALSE

Notes

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

If the option is given, but no value is provided, then ivalue 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 ivalue is NOT changed. Thus you should ALWAYS initialize ivalue if you access it without first checking that the set flag is true.

See Also

PetscOptionsGetBool3(), PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(), PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsGetInt(), PetscOptionsBool(), PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHeadBegin(), PetscOptionsStringArray(), PetscOptionsRealArray(), PetscOptionsScalar(), PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(), PetscOptionsFList(), PetscOptionsEList()

Level

beginner

Location

src/sys/objects/options.c

Examples

src/dm/impls/stag/tutorials/ex4.c
src/dm/tutorials/ex21.c
src/dm/impls/stag/tutorials/ex6.c
src/dm/impls/stag/tutorials/ex3.c
src/dm/tutorials/ex12.c
src/dm/tutorials/ex5.c
src/dm/label/tutorials/ex1f90.F90
src/dm/tutorials/ex1.c
src/dm/tutorials/ex15.c
src/dm/impls/stag/tutorials/ex2.c

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