[#BloombergLP-bslma-AllocatorTraits_PropOnCopyAssign-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::AllocatorTraits_PropOnCopyAssign
:relfileprefix: ../../
:mrdocs:

Default copy‐assignment propagation trait to `false_type` when undefined.

== Synopsis

Declared in `<bslma_allocatortraits.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class ALLOCATOR_TYPE,
    bool = AllocatorTraits_HasPropOnCopyAssign<ALLOCATOR_TYPE>::value>
struct AllocatorTraits_PropOnCopyAssign
    : xref:bsl/false_type.adoc[bsl::false_type]
----

== Description

This `struct` template sets the boolean type for the attribute named `propagate_on_container_copy_assignment` to `bsl::false_type` if the given (template parameter) `ALLOCATOR_TYPE` does not define such an alias (i.e., `false == AllocatorTraits_HasPropOnCopyAssign<ALLOCATOR_TYPE>::value`).

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/false_type.adoc[bsl::false_type]`
| Metafunction representing the boolean constant `false`.
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/AllocatorTraits_PropOnCopyAssign-04.adoc[`AllocatorTraits_PropOnCopyAssign<ALLOC, true>`] 
| Use the allocator's nested copy‐assignment propagation trait when defined.
|===



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