# PetscObjectComposeFunctionDynamic

Associates a function with a given PETSc object. Collective on PetscObject

### Input Parameters

| obj | - the PETSc object; this must be cast with a (PetscObject), for example, PetscObjectCompose((PetscObject)mat,...);
| name | - name associated with the child function
| fname | - name of the function
| ptr | - function pointer (or PETSC_NULL if using dynamic libraries)

### Synopsis

    PetscErrorCode PetscObjectComposeFunctionDynamic(PetscObject obj,const char name[],const char fname[],void *ptr)

### Notes

To remove a registered routine, pass in a PETSC_NULL rname and fnc().

PetscObjectComposeFunctionDynamic() can be used with any PETSc object (such as Mat, Vec, KSP, SNES, etc.) or any user-provided object.

The composed function must be wrapped in a EXTERN_C_BEGIN/END for this to work in C++/complex with dynamic link libraries (PETSC_USE_DYNAMIC_LIBRARIES) enabled.

### See Also

PetscObjectQueryFunction()

Level:advanced
Location:include/petsc.h
Index of all Sys routines
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