[#BloombergLP-bslstp-Util-swapContainers]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstp.adoc[bslstp]::xref:BloombergLP/bslstp/Util.adoc[Util]::swapContainers
:relfileprefix: ../../../
:mrdocs:

Exchange the contents of the specified containers.

== Synopsis

Declared in `<bslstp_util.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class CONTAINER,
    class QUICKSWAP_FUNC>
static
void
swapContainers(
    CONTAINER& c1,
    CONTAINER& c2,
    QUICKSWAP_FUNC const& quickswap);
----

== Description

Correctly handle the case where the two containers have different allocator values. The `quickswap` argument is a binary function object that is called to quickly swap two `CONTAINER` objects with matching allocators. (The `quickswap` object does not need to check that the allocator matched ‐‐ it is guaranteed by the caller.) Strong exception guarantee: if the allocator or copy constructor of either container throws an exception, then the values of `c1` and `c2` are left unchanged. The `quickswap` function must not throw an exception.


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