#include "petscvec.h" PetscErrorCode VecTaggerRegister(const char sname[],PetscErrorCode (*function)(VecTagger))Not collective
| name_impl | - name of a new user-defined implementation | |
| routine_create | - routine to create method context | 
   VecTaggerRegister("my_impl",MyImplCreate);
Then, this implementation can be chosen with the procedural interface via
    VecTaggerSetType(tagger,"my_impl")
or at runtime via the option
    -snes_type my_solver