PetscHeaderDestroy#

Final step in destroying a PetscObject

Synopsis#

#include <petsc/private/petscimpl.h>
PetscErrorCode PetscHeaderDestroy(PetscObject *obj)

Input Parameter#

h - A pointer to the header created with PetscHeaderCreate()

Notes#

h is freed and set to PETSC_NULLPTR when this routine returns.

Example Usage#

  PetscObject obj;

  PetscHeaderCreate(obj, ...);
  // use obj...

  // note pointer to obj is used
  PetscHeaderDestroy(&obj);

Note that this routine is the last step when destroying higher-level PetscObjects as it deallocates the memory for the structure itself:

  typedef struct MyPetscObject_s *MyPetscObject;
  struct MyPetscObject_s
  {
    _p_PetscObject  hdr;
    PetscInt       *foo;
    PetscScalar    *bar;
  };

  // assume obj is created/initialized elsewhere...
  MyPetscObject obj;

  // OK, should dispose of all dynamically allocated resources before calling
  // PetscHeaderDestroy()
  PetscFree(obj->foo);

  // OK, dispose of obj
  PetscHeaderDestroy(&obj);

  // ERROR, obj points to NULL here, accessing obj->bar may result in segmentation violation!
  // obj->bar is potentially leaked!
  PetscFree(obj->bar);

Level#

developer

Location#

include/petsc/private/petscimpl.h

Examples#

src/ts/tutorials/ex14.c
src/snes/tutorials/ex48.c

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