[#bsl-deque-0c-swap]
= xref:bsl.adoc[bsl]::xref:bsl/deque-0c.adoc[deque]::swap
:relfileprefix: ../../
:mrdocs:

Exchange the value of this object with that of the specified `other` object; also exchange the allocator of this object with that of `other` if the (template parameter) type `ALLOCATOR` has the `propagate_on_container_swap` trait, and do not modify either allocator otherwise. This method provides the no‐throw exception‐safety guarantee. This operation has `O[1]` complexity if either this object was created with the same allocator as `other` or `ALLOCATOR` has the `propagate_on_container_swap` trait; otherwise, it has `O[n + m]` complexity, where `n` and `m` are the number of elements in this object and `other`, respectively. Note that this method`s support for swapping objects created with different allocators when `ALLOCATOR` does not have the `propagate_on_container_swap` trait is a departure from the C++ Standard.

== Synopsis

Declared in `<bslstl_deque.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
swap(xref:bsl/deque-0c.adoc[deque<VALUE_TYPE, ALLOCATOR>]& other) noexcept(AllocatorTraits::is_always_equal::value);
----


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