[#bsl-allocator_traits-0108-is_always_equal]
= xref:bsl.adoc[bsl]::xref:bsl/allocator_traits-0108.adoc[allocator_traits]::is_always_equal
:relfileprefix: ../../
:mrdocs:

Identical to, or derived from `true_type` if two allocators of parameterized `ALLOCATOR_TYPE` always compare equal; otherwise identical to or derived from `false_type`. This type is `ALLOCATOR_TYPE::is_always_equal` if such a type is defined, and `is_empty<ALLOCATOR_TYPE>` otherwise.

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef BloombergLP::bslma::AllocatorTraits_IsAlwaysEqual<ALLOCATOR_TYPE>::type is_always_equal;
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