[#bsl-hash_map-operator_subs]
= xref:bsl.adoc[bsl]::xref:bsl/hash_map.adoc[hash_map]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference to the mapped value for `__key`, inserting a default‐constructed value if the key is absent.

== Synopsis

Declared in `<bslstp_hashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
_Tp&
operator[](xref:bsl/hash_map/key_type.adoc[key_type] const& __key);
----


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