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# PetscFortranCallbackGetSizes
get sizes of class and subtype pointer arrays 
## Synopsis
```
#include "petscsys.h"    
PetscErrorCode PetscFortranCallbackGetSizes(PetscClassId classid, PetscFortranCallbackId *numbase, PetscFortranCallbackId *numsubtype)
```
Collective


## Input Parameter

- ***classid -*** class Id



## Output Parameters

- ***numbase -*** number of registered class callbacks
- ***numsubtype -*** max number of registered subtype callbacks





## See Also
 `PetscFortranCallbackRegister()`, `PetscObjectCopyFortranFunctionPointers()`, `PetscObjectSetFortranCallback()`, `PetscObjectGetFortranCallback()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/objects/fcallback.c.html#PetscFortranCallbackGetSizes">src/sys/objects/fcallback.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/objects/fcallback.c)


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