[#absl-btree_map-operator_subs-07]
= xref:absl.adoc[absl]::xref:absl/btree_map.adoc[btree_map]::operator[]
:relfileprefix: ../../
:mrdocs:

== Synopsis

Declared in `<absl/container/btree_map.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class K = key_type,
    int&...,
    EnableIf<LifetimeBoundK<K, true>> = 0>
mapped_type&
operator[](key_arg<K> const& k);
----


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