[#BloombergLP-bdljsn-swap-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::swap
:relfileprefix: ../../
:mrdocs:

Exchange the value of the specified `a` `Json` object with that of the specified `b` `Json` object. If an exception is thrown, both objects are left in valid but unspecified states. This operation guarantees O[1] complexity. The behavior is undefined unless `a` was created with the same allocator as `b`.

== Synopsis

Declared in `<bdljsn_json.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
swap(
    xref:BloombergLP/bdljsn/Json.adoc[Json]& a,
    xref:BloombergLP/bdljsn/Json.adoc[Json]& b);
----


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