[#BloombergLP-bslma-IsStdAllocator-07]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::IsStdAllocator
:relfileprefix: ../../
:mrdocs:

Metafunction to determine whether the specified template parameter `TYPE` meets the minimum requirements for a C++11 allocator. Specifically, this `struct` is derived from `true_type` if `TYPE` has a nested `value_type` and supports the operation `a.allocate(bytes)`, where `a` has type `TYPE` and `bytes` has type `allocator_traits<TYPE>::size_type`; otherwise it is derived from `false_type`.

== Synopsis

Declared in `<bslma_isstdallocator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
struct IsStdAllocator
    : /* implementation-defined */::type
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `/* implementation-defined */::type`
| 
|===

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslma/IsStdAllocator-06f.adoc[`IsStdAllocator<bsl::allocator<void>>`] 
| `bsl::allocator<void>` is not an allocator type, even though all other instantiations are allocator types.
| xref:BloombergLP/bslma/IsStdAllocator-01.adoc[`IsStdAllocator<std::allocator<void>>`] 
| `std::allocator<void>` is not an allocator type, even though all other specializations are allocator types.
| xref:BloombergLP/bslma/IsStdAllocator-0f68.adoc[`IsStdAllocator<bsl::allocator<TYPE>>`] 
| A `bsl::allocator` inherits its `allocate` method from a base class, which causes `IsStdAllocator` to fail the auto‐detected it.
| xref:BloombergLP/bslma/IsStdAllocator-065.adoc[`IsStdAllocator<std::allocator<TYPE>>`] 
| Specialization for `std::allocator`.
| xref:BloombergLP/bslma/IsStdAllocator-0f6d.adoc[`IsStdAllocator<bsl::polymorphic_allocator<TYPE>>`] 
| Declare `polymorphic_allocator` as a C++11 compatible allocator for all versions of C++.
| xref:BloombergLP/bslma/IsStdAllocator-0a.adoc[`IsStdAllocator<TYPE&>`] 
| Specialization for lvalue reference types.
| xref:BloombergLP/bslma/IsStdAllocator-0b.adoc[`IsStdAllocator<TYPE&&>`] 
| Specialization for rvalue reference types.
|===



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