[#BloombergLP-bsls-AtomicUint-testAndSwap]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicUint.adoc[AtomicUint]::testAndSwap
:relfileprefix: ../../../
:mrdocs:

Compare the value of this object to the specified `compareValue`. If they are equal, set the value of this atomic unsigned integer to the specified `swapValue`, otherwise leave this value unchanged. Return the previous value of this atomic unsigned integer, whether or not the swap occurred. Note that the entire test‐and‐swap operation is performed atomically.

== Synopsis

Declared in `<bsls_atomic.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
unsigned int
testAndSwap(
    unsigned int compareValue,
    unsigned int swapValue);
----


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