[#BloombergLP-bsls-AtomicOperations_DefaultUint64-00-swapUint64AcqRel]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicOperations_DefaultUint64-00.adoc[AtomicOperations_DefaultUint64]::swapUint64AcqRel
:relfileprefix: ../../../
:mrdocs:

Atomically set the value of the specified `atomicUint` to the specified `swapValue` and return its previous value, providing the acquire/release memory ordering guarantee.

== Synopsis

Declared in `<bsls_atomicoperations_default.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64]
swapUint64AcqRel(
    AtomicTypes::Uint64* atomicUint,
    xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64] swapValue);
----


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