[#BloombergLP-bdlc-FlatHashMap-insert_or_assign-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap]::insert_or_assign
:relfileprefix: ../../../
:mrdocs:

Insert or assign the mapped value for the specified `key`.

== Synopsis

Declared in `<bdlc_flathashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class M>
xref:bsl/pair-0b.adoc[bsl::pair<iterator, bool>]
insert_or_assign(
    LOOKUP_KEY&& key,
    M&& obj)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

== Description

If this map contains an entry with a key equivalent to the specified `key`, assign the specified `obj` to the `mapped_type` of that entry, and return an iterator to that entry and `false`. Otherwise, insert a new entry into the map with the and return an iterator to that entry and `true`. `obj` is left in a (valid) unspecified state.

== Return Value

pair of iterator to the element and `true` if inserted

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| transparent key to insert or update
| *obj*
| mapped value to assign or move‐insert
|===


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