[#BloombergLP-bslma-AllocatorUtil_Traits-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::xref:BloombergLP/bslma/AllocatorUtil_Traits-02.adoc[AllocatorUtil_Traits]<t_MEMORY_RSRC*, t_TYPE>
:relfileprefix: ../../
:mrdocs:

Traits for an allocator expressed as a pointer to a memory resource.

== Synopsis

Declared in `<bslma_allocatorutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_MEMORY_RSRC,
    class t_TYPE>
struct xref:BloombergLP/bslma/AllocatorUtil_Traits-02.adoc[AllocatorUtil_Traits]<t_MEMORY_RSRC*, t_TYPE>
    : xref:bsl/allocator_traits-0108.adoc[bsl::allocator_traits<bsl::conditional<bsl::is_convertible<t_MEMORY_RSRC *, bslma::Allocator *>::value, bsl::allocator<t_TYPE>, bsl::polymorphic_allocator<t_TYPE>>::type>]
----

== Description

This specialization is for allocators expressed as a pointer to class derived from `bsl::memory_resource`. The base class will be `bsl::allocator_traits<bsl::allocator<t_TYPE>>` if `t_MEMORY_RSRC` is derived from `bsl::Allocator`; otherwise the base class will be `bsl::allocator_traits<bsl::polymorphic_allocator<t_TYPE>>`.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/allocator_traits-0108.adoc[bsl::allocator_traits<bsl::conditional<bsl::is_convertible<t_MEMORY_RSRC *, bslma::Allocator *>::value, bsl::allocator<t_TYPE>, bsl::polymorphic_allocator<t_TYPE>>::type>]`
| Uniform interface to nested types and operations of any allocator.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/allocator_traits-0108/allocator_type.adoc[`allocator_type`] 
| This `typedef` is an alias to the (template parameter) `ALLOCATOR_TYPE`.
| xref:bsl/allocator_traits-0108/const_pointer.adoc[`const_pointer`] 
| This `typedef` is an alias to `AllocatorTraits_ConstPointerType<ALLOCATOR_TYPE>::type`.
| xref:bsl/allocator_traits-0108/const_void_pointer.adoc[`const_void_pointer`] 
| Const void pointer type for the allocator.
| xref:bsl/allocator_traits-0108/difference_type.adoc[`difference_type`] 
| This `typedef` is an alias to `AllocatorTraits_DifferenceType<ALLOCATOR_TYPE>::type`.
| xref:bsl/allocator_traits-0108/is_always_equal.adoc[`is_always_equal`] 
| `true_type` if two allocators always compare equal; else `false_type`.
| xref:bsl/allocator_traits-0108/pointer.adoc[`pointer`] 
| This `typedef` is an alias to `AllocatorTraits_PointerType<ALLOCATOR_TYPE>::type`.
| xref:bsl/allocator_traits-0108/propagate_on_container_copy_assignment.adoc[`propagate_on_container_copy_assignment`] 
| `true_type` if the allocator propagates on copy assignment.
| xref:bsl/allocator_traits-0108/propagate_on_container_move_assignment.adoc[`propagate_on_container_move_assignment`] 
| `true_type` if the allocator propagates on move assignment.
| xref:bsl/allocator_traits-0108/propagate_on_container_swap.adoc[`propagate_on_container_swap`] 
| `true_type` if the allocator propagates on container swap.
| xref:bsl/allocator_traits-0108/rebind_alloc.adoc[`rebind_alloc`] 
| Rebind this allocator to the specified `ELEMENT_TYPE`.
| xref:bsl/allocator_traits-0108/rebind_traits.adoc[`rebind_traits`] 
| Rebind this allocator traits type to the specified `ELEMENT_TYPE`.
| xref:bsl/allocator_traits-0108/size_type.adoc[`size_type`] 
| This `typedef` is an alias to `AllocatorTraits_SizeType<ALLOCATOR_TYPE>::type`.
| xref:bsl/allocator_traits-0108/value_type.adoc[`value_type`] 
| This `typedef` is an alias to `ALLOCATOR_TYPE::value_type`.
| xref:bsl/allocator_traits-0108/void_pointer.adoc[`void_pointer`] 
| This `typedef` is an alias to `AllocatorTraits_VoidPointerType<ALLOCATOR_TYPE>::type`.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/allocator_traits-0108/allocate-03.adoc[`allocate`] 
| `allocate` overloads
| xref:bsl/allocator_traits-0108/construct.adoc[`construct`] 
| Construct an `ELEMENT_TYPE` object at `elementAddr`.
| xref:bsl/allocator_traits-0108/deallocate.adoc[`deallocate`] 
| Deallocate the storage at `elementAddr` for `n` objects.
| xref:bsl/allocator_traits-0108/destroy.adoc[`destroy`] 
| Destroy the `ELEMENT_TYPE` object at `elementAddr`.
| xref:bsl/allocator_traits-0108/max_size.adoc[`max_size`] 
| Return the maximum number of objects `allocate` can return.
| xref:bsl/allocator_traits-0108/select_on_container_copy_construction.adoc[`select_on_container_copy_construction`] 
| Return the allocator to use when copy‐constructing a container.
|===



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