[#BloombergLP-bslma-AllocatorTraits_IsAlwaysEqual-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::AllocatorTraits_IsAlwaysEqual
:relfileprefix: ../../
:mrdocs:

This `struct` template sets the boolean type for the attribute named `is_always_equal` to the nested type alias in the given (template parameter) `ALLOC` if `ALLOC` defines such an alias (i.e., if `true == AllocatorTraits_HasIsAlwaysEqual<ALLOCATOR_TYPE>::value`).

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class ALLOC,
    bool = AllocatorTraits_HasIsAlwaysEqual<ALLOC>::value>
struct AllocatorTraits_IsAlwaysEqual
    : ALLOC::is_always_equal
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `ALLOC::is_always_equal`
| 
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/AllocatorTraits_IsAlwaysEqual-0a.adoc[`AllocatorTraits_IsAlwaysEqual<ALLOC, false>`] 
| This `struct` template sets the boolean type for the attribute named `is_always_equal` to `bsl::is_empty<ALLOC>` if the given (template parameter) `ALLOC` does not define such an alias (i.e., if `false == AllocatorTraits_HasIsAlwaysEqual<ALLOCATOR_TYPE>::value`).
|===



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