[#bsl-allocator_traits-0ae-max_size]
= xref:bsl.adoc[bsl]::xref:bsl/allocator_traits-0ae.adoc[allocator_traits<std::allocator<ALLOCATOR_TYPE>>]::max_size
:relfileprefix: ../../
:mrdocs:

The maximum supported allocation size

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
static
size_type
max_size(_Alloc const& __a) noexcept;
----

== Description

Returns `__a.max_size()` if that expression is well‐formed, otherwise returns `numeric_limits<size_type>::max()`

== Return Value

`__a.max_size()` or `numeric_limits<size_type>::max()`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *__a*
| An allocator.
|===


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