[#bsl-unordered_map-0bf-emplace_hint]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::emplace_hint
:relfileprefix: ../../
:mrdocs:

Insert into this unordered map 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`, if a key equivalent to such a value does not already exist in this map; otherwise, this method has no effect (other than possibly creating a temporary `value_type` object). Return an iterator referring to the (possibly newly created and inserted) object in this map whose key is equivalent to that of an object constructed from `args`. The average and worst case complexity of this operation is not affected by the specified `hint`. This method requires that the (template parameter) types `KEY` and `VALUE` both be `emplace‐constructible` from `args` (see {Requirements on `value_type`}). The behavior is undefined unless `hint` is an iterator in the range `[begin() .. end()]` (both endpoints included). Note that `hint` is ignored (other than possibly asserting its validity in some build modes).

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/unordered_map-0bf/iterator.adoc[iterator]
emplace_hint(
    xref:bsl/unordered_map-0bf/const_iterator.adoc[const_iterator] hint,
    Args&&... args);
----


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