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

Exchange the targets held by the specified `a` and specified `b` objects. The behavior is undefined unless 'a.get_allocator() == b.get_allocator()'.

== 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;
----


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