[#BloombergLP-bsls-AtomicOperations_DefaultPointer64-061-testAndSwapPtrAcqRel]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/AtomicOperations_DefaultPointer64-061.adoc[AtomicOperations_DefaultPointer64]::testAndSwapPtrAcqRel
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Conditionally set the value of the specified `atomicPtr` to the specified `swapValue` if and only if the value of `atomicPtr` equals the value of the specified `compareValue`, and return the initial value of `atomicPtr`, providing the acquire/release memory ordering guarantee. The whole operation is performed atomically.

== Synopsis

Declared in `<bsls_atomicoperations_default.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void*
testAndSwapPtrAcqRel(
    AtomicTypes::Pointer* atomicPtr,
    void* compareValue,
    void* swapValue);
----


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