[#bsl-unordered_map-02b-insert-021]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::insert
:relfileprefix: ../../
:mrdocs:

Insert the specified `value` into this unordered map if the key (the `first` element) of the object referred to by `value` does not already exist in this unordered map; otherwise, this method has no effect (a `value_type` object having the same key as the converted `value` already exists in this unordered map) . Return an iterator referring to ether the newly inserted) `value_type` object or to the existing object whose key is equivalent to the key of `value`. 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 `move‐constructible` (see {Requirements on `value_type`}) and that the `value_type` be constructible from the (template parameter) `ALT_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). Also note that this one template stands in for three `insert` functions in the C++11 standard.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ALT_VALUE_TYPE>
xref:bsl/unordered_map-02b/iterator.adoc[iterator]
insert(
    xref:bsl/unordered_map-02b/const_iterator.adoc[const_iterator] hint,
    ALT_VALUE_TYPE&& value)
requires std::is_constructible<value_type,
                                             ALT_VALUE_TYPE&&>::value;
----


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