[#BloombergLP-bdlb-swap-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::swap
:relfileprefix: ../../
:mrdocs:

Exchange the values of the specified `rhs` and `lhs` objects. This function provides the no‐throw exception‐safety guarantee if the (template parameter) `TYPE` provides that guarantee, the two objects were created with the same allocator (if applicable), and the result of the `isNull` method for the two objects is the same; otherwise this function provides the basic guarantee.

== Synopsis

Declared in `<bdlb_nullablevalue.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
void
swap(
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<TYPE>]& lhs,
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<TYPE>]& rhs)
requires BloombergLP::bslma::UsesBslmaAllocator<TYPE>::value;
----


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