[#bsl-unordered_set-02a-swap]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-02a.adoc[unordered_set<ManagedAttribute, AttributeHash>]::swap
:relfileprefix: ../../
:mrdocs:

Exchange the value, hasher, key‐equality functor, and `max_load_factor` of this object with those 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 if and only if both the (template parameter) types `HASH` and `EQUAL` provide no‐throw swap operations; if an exception is thrown, both objects are left in valid but unspecified states. This operation guarantees `O[1]` complexity. The behavior is undefined unless either this object was created with the same allocator as `other` or `ALLOCATOR` has the `propagate_on_container_swap` trait.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
swap(xref:bsl/unordered_set-0d2d.adoc[unordered_set<ManagedAttribute, AttributeHash>]& other) noexcept(/* see-below */);
----

== Exception specification

This function is potentially-throwing unless `AllocatorTraits::is_always_equal::value && bsl::is_nothrow_swappable<HASH>::value && bsl::is_nothrow_swappable<EQUAL>::value`.


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