# PetscFVRegister
Adds a new `PetscFV` implementation 
## Synopsis
```
#include "petscfv.h" 
PetscErrorCode PetscFVRegister(const char sname[], PetscErrorCode (*function)(PetscFV))
```
Not Collective


## Input Parameters

- ***name        -*** The name of a new user-defined creation routine
- ***create_func -*** The creation routine itself



## Sample usage
```none
    PetscFVRegister("my_fv", MyPetscFVCreate);
```


Then, your PetscFV type can be chosen with the procedural interface via
```none
    PetscFVCreate(MPI_Comm, PetscFV *);
    PetscFVSetType(PetscFV, "my_fv");
```

or at runtime via the option
```none
    -petscfv_type my_fv
```





## Note
`PetscFVRegister()` may be called multiple times to add several user-defined PetscFVs


## See Also
 `PetscFV`, `PetscFVType`, `PetscFVRegisterAll()`, `PetscFVRegisterDestroy()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/dt/fv/interface/fv.c.html#PetscFVRegister">src/dm/dt/fv/interface/fv.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/dt/fv/interface/fv.c)


[Index of all FV routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
