[#BloombergLP-ball-swap-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::swap
:relfileprefix: ../../
:mrdocs:

Swap the value of the specified `a` object with the value of the specified `b` object. If `a` and `b` were created with the same allocator, then this method provides the no‐throw exception‐safety guarantee; otherwise, it provides the basic guarantee.

== Synopsis

Declared in `<ball_userfields.h>`

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


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