[#bsl-unordered_multiset-06c-operator_assign-0f]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::operator=
:relfileprefix: ../../
:mrdocs:

Assign to this object the value, hash function, and equality comparator of the specified `rhs` object, propagate to this object the allocator of `rhs` if the `ALLOCATOR` type has trait `propagate_on_container_move_assignment`, and return a reference providing modifiable access to this object. The contents of `rhs` are moved (in constant time) to this unordered multiset if `get_allocator() == rhs.get_allocator()` (after accounting for the aforementioned trait); otherwise, all elements in this unordered multiset are either destroyed or move‐assigned to and each additional element in `rhs` is move‐inserted into this unordered multiset. `rhs` is left in a valid but unspecified state, and if an exception is thrown, `*this` is left in a valid but unspecified state. This method requires that the (template parameter) type `KEY` be both `move‐assignable` and `move‐insertable` into this unordered multiset (see {Requirements on `KEY`}).

== Synopsis

Declared in `<bslstl_unorderedmultiset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c.adoc[unordered_multiset<KEY, HASH, EQUAL, ALLOCATOR>]&
operator=(xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<unordered_multiset>] rhs) noexcept(/* see-below */);
----

== Exception specification

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


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