[#bsl-unordered_multiset-06c-emplace_hint]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::emplace_hint
:relfileprefix: ../../
:mrdocs:

Insert into this unordered multiset a newly created `value_type` object, constructed by forwarding `get_allocator()` (if required) and the specified (variable number of) `args` to the corresponding constructor of `value_type` (in constant time if the specified `hint` refers to an element in this container equivalent to the newly created `value_type` object). Return an iterator referring to the newly created and inserted object in this unordered multiset whose value is equivalent to that of an object constructed from `args`. If `hint` does not refer to an element in this container equivalent to the newly created `value_type` object, this operation has worst case `O[N]` and average case constant‐time complexity, where `N` is the size of this unordered multiset. This method requires that the (template parameter) type `KEY` be `emplace‐constructible` into this unordered multiset from `args` (see {Requirements on `KEY`}). The behavior is undefined unless `hint` is an iterator in the range `[begin() .. end()]` (both endpoints included).

== Synopsis

Declared in `<bslstl_unorderedmultiset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/unordered_multiset-06c/iterator.adoc[unordered_multiset<KEY, HASH, EQUAL, ALLOCATOR>::iterator]
emplace_hint(
    xref:bsl/unordered_multiset-06c/const_iterator.adoc[const_iterator] hint,
    Args&&... args);
----


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