[#bsl-swap-026]
= xref:bsl.adoc[bsl]::swap
:relfileprefix: ../
:mrdocs:

Exchange the targets held by the specified `a` and `b` functions.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class PROTOTYPE>
void
swap(
    xref:bsl/function-0a.adoc[function<PROTOTYPE>]& a,
    xref:bsl/function-0a.adoc[function<PROTOTYPE>]& b) noexcept;
----

== Description

The behavior is undefined unless `a.get_allocator() == b.get_allocator()`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| first function participating in the swap
| *b*
| second function participating in the swap
|===


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