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# PetscHMapIVSetWithMode
Set a (key,value) entry in the hash table according to an `InsertMode` 
## Synopsis
```
#include <petsc/private/hashmapiv.h>
PetscErrorCode PetscHMapIVSetWithMode(PetscHMapIV ht, PetscInt key, PetscScalar val, InsertMode mode)
```

## Input Parameters

- ***ht   -*** The hash table
- ***key  -*** The key
- ***val  -*** The value
- ***mode -*** The insertion mode





## Notes
`mode` may be any of the following:
- `INSERT_VALUES`\: this routine behaves identically to `PetscHMapIVSet()`.
- `ADD_VALUES`\: if `key` is found `val` is added to the current entry, otherwise (`key`, `value`)
is inserted into `ht` as-if-by `INSERT_VALUES`.
- `MAX_VALUES`\: if `key` is found the current value is replaced by the maximum of `val` and the
current entry, otherwise (`key`, `value`) is inserted into `ht` as-if-by
`INSERT_VALUES`.
- `MIN_VALUES`\: if `key` is found the current value is replaced by the minimum of `val` and the
current entry, otherwise (`key`, `value`) is inserted into `ht` as-if-by
`INSERT_VALUES`.

All other `InsertMode`s will raise an error if used.

Since this routine relies on `+`, `<`, and `>` being well-formed for a particular type
it is not available by default for all PETSc hash table instantiations. If a particular
instantiation supports this routine it must define `PETSC_HMAPIV_HAVE_EXTENDED_API` to
`1`.


## See Also
 `PetscHMapIVSet()`, `PetscHMapIVGet()`, `PetscHMapIVGetWithDefault()`,
`PetscHMapIVIterSet()`

## Level
developer

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


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