[#BloombergLP-bslma-AllocatorTraits_HasIsAlwaysEqual]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::AllocatorTraits_HasIsAlwaysEqual
:relfileprefix: ../../
:mrdocs:

This `struct` template provides a mechanism for determining whether a given (template parameter) `ALLOCATOR_TYPE` defines a nested alias named`is_always_equal`. The static boolean member `value` (nested alias named `type`) is `true` (`bsl::true_type`) if `ALLOCATOR_TYPE` defines such an alias, and `false` (`bsl::false_type`) otherwise.

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ALLOC>
struct AllocatorTraits_HasIsAlwaysEqual;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/AllocatorTraits_HasIsAlwaysEqual/type.adoc[`type`] 
| `integral_constant` for whether `ALLOC` defines `is_always_equal`.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/AllocatorTraits_HasIsAlwaysEqual/value.adoc[`value`] 
| `true` if `ALLOC` defines a nested `is_always_equal` alias.
|===



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