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---
date: 2022-01-07T08:00:00Z
title: Function ATOMIC-INTEGER-INCF
weight: 6
---
#### Syntax:
**atomic-integer-incf** atomic-integer *&optional* (delta 1) => new-value
#### Arguments and values:
*atomic-integer* -> an [**atomic-integer**](../atomic-integer)
object.\
*delta* -> an integer.\
*new-value* -> a non-negative integer.
#### Description
Increments the value of `atomic-integer` by `delta`.
Returns the new value of `atomic-integer`.
#### Exceptional situations:
Signals an error of type
[**type-error**](http://www.lispworks.com/documentation/HyperSpec/Body/e_tp_err.htm#type-error)
if `atomic-integer` is not an [**atomic-integer**](../atomic-integer)
object.\
Signals an error of type
[**type-error**](http://www.lispworks.com/documentation/HyperSpec/Body/e_tp_err.htm#type-error)
if `delta` is not an integer.
#### See also:
[**atomic-integer**](../atomic-integer),
[**atomic-integer-decf**](../atomic-integer-decf),
[**make-atomic-integer**](../make-atomic-integer)
#### Notes:
None.
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