[#BloombergLP-bsls-AtomicOperations_DefaultUint64-00-testAndSwapUint64]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicOperations_DefaultUint64-00.adoc[AtomicOperations_DefaultUint64]::testAndSwapUint64
: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 sequential consistency memory ordering guarantee. The whole operation is performed atomically.

== Synopsis

Declared in `<bsls_atomicoperations_default.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64]
testAndSwapUint64(
    AtomicTypes::Uint64* atomicUint,
    xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64] compareValue,
    xref:BloombergLP/bsls/Types/Uint64.adoc[Types::Uint64] swapValue);
----


[.small]#Created with https://www.mrdocs.com[MrDocs]#