[#BloombergLP-bsls-AtomicOperations-testAndSwapUint64AcqRel]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicOperations.adoc[AtomicOperations]::testAndSwapUint64AcqRel
:relfileprefix: ../../../
:mrdocs:

Conditionally set the value of the specified `atomicUint` to the specified `swapValue` if and only if the value of `atomicUint` equals the value of the specified `compareValue`, and return the initial value of `atomicUint`, providing the acquire/release memory ordering guarantee. The whole operation is performed atomically.

== Synopsis

Declared in `<bsls_atomicoperations.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64]
testAndSwapUint64AcqRel(
    xref:BloombergLP/bsls/Atomic_TypeTraits-0b/Uint64.adoc[AtomicTypes::Uint64]* atomicUint,
    xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64] compareValue,
    xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64] swapValue);
----


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