[#bsl-unordered_set-0d2d-max_size]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-0d2d.adoc[unordered_set]::max_size
:relfileprefix: ../../
:mrdocs:

Return a theoretical upper bound on this set's size.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-0d2d/size_type.adoc[unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::size_type]
max_size() const noexcept;
----

== Description

Return a theoretical upper bound on the largest number of elements that this set could possibly hold. Note that there is no guarantee that the set can successfully grow to the returned size, or even close to that size without running out of resources.

== Return Value

theoretical maximum number of elements


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