:orphan:
# SNESNewtonTRDCSetPostCheck
Sets a user function that is called after the search step has been determined but before the next function evaluation. Allows the user a chance to change or override the decision of the line search routine 
## Synopsis
```
#include "petscsnes.h"   
PetscErrorCode SNESNewtonTRDCSetPostCheck(SNES snes, PetscErrorCode (*func)(SNES, Vec, Vec, Vec, PetscBool *, PetscBool *, void *), void *ctx)
```
Logically Collective


## Input Parameters

- ***snes -*** the nonlinear solver object
- ***func -*** [optional] function evaluation routine, for the calling sequence see `SNESNewtonTRDCPostCheck()`
- ***ctx  -*** [optional] user-defined context for private data for the function evaluation routine (may be `NULL`)





## Note
This function is called BEFORE the function evaluation within the `SNESNEWTONTRDC` solver while the function set in
`SNESLineSearchSetPostCheck()` is called AFTER the function evaluation.


## See Also
 `SNESNEWTONTRDC`, `SNESNewtonTRDCPostCheck()`, `SNESNewtonTRDCGetPostCheck()`, `SNESNewtonTRDCSetPreCheck()`, `SNESNewtonTRDCGetPreCheck()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/ntrdc/ntrdc.c.html#SNESNewtonTRDCSetPostCheck">src/snes/impls/ntrdc/ntrdc.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/snes/impls/ntrdc/ntrdc.c)


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