[#BloombergLP-bdlc-swap-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::swap
:relfileprefix: ../../
:mrdocs:

Exchange the contents of the two maps.

== Synopsis

Declared in `<bdlc_flathashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class K,
    class V,
    class H,
    class E>
void
swap(
    xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap<K, V, H, E>]& a,
    xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap<K, V, H, E>]& b);
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap], declared only inside that class: it can be found only through argument-dependent lookup.
====

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| first map
| *b*
| second map
|===


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