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# PetscHSetIQueryAdd
Query and add an entry in the hash set 
## Synopsis
```
#include <petsc/private/hashseti.h>
PetscErrorCode PetscHSetIQueryAdd(PetscHSetI ht, PetscInt key, PetscBool *missing)
```

## Input Parameters

- ***ht  -*** The hash set
- ***key -*** The entry



## Output Parameter

- ***missing -*** Boolean indicating whether the entry was missing





## See Also
 `PetscHSetIQueryDel()`, `PetscHSetIAdd()`, `PetscHSetIHas()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petsc/private/generated_khash.h.html#PetscHSetIQueryAdd">include/petsc/private/generated_khash.h</A>


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