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

Whether all instances of the allocator type compare equal.

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using is_always_equal = __detected_or_t<is_empty<_Alloc>, __equal, _Alloc>::type;
----

== Description

`Alloc::is_always_equal` if that type exists, otherwise `is_empty<Alloc>::type`


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