petsc-3.9.4 2018-09-11

PetscOptionsString

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

Synopsis

#include "petscsys.h"   
PetscErrorCode  PetscOptionsString_Private(PetscOptionItems *PetscOptionsObject,const char opt[],const char text[],const char man[],const char currentvalue[],char value[],size_t len,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; caller is responsible for setting this value correctly. This is not used to set value
	len	- length of the result string including null terminator

Output Parameter

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

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

Even if the user provided no string (for example -optionname -someotheroption) the flag is set to PETSC_TRUE (and the string is fulled with nulls).

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.

PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(), PetscOptionsGetInt(NULL,),
PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool() PetscOptionsInt(), PetscOptionsReal(), PetscOptionsBool(), PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHead(), PetscOptionsStringArray(),PetscOptionsRealArray(), PetscOptionsScalar(), PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(), PetscOptionsFList(), PetscOptionsEList()

Level

beginner

Location

src/sys/objects/aoptions.c

Examples