[#bsl-unordered_map-02b-insert-06]
= 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 a `pair` whose `first` member is an iterator referring to the (possibly newly inserted) `value_type` object in this unordered map whose key is the equivalent to that of the object to be inserted, and whose `second` member is `true` if a new value was inserted, and `false` if a value having an equivalent key was already present. Note that 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`. 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/pair-0b.adoc[pair<iterator, bool>]
insert(ALT_VALUE_TYPE&& value)
requires std::is_constructible<value_type,
                                             ALT_VALUE_TYPE&&>::value;
----


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