[#BloombergLP-bslmf-IsReferenceWrapper-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::IsReferenceWrapper
:relfileprefix: ../../
:mrdocs:

Metafunction for detecting reference wrappers.

== Synopsis

Declared in `<bslmf_isreferencewrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
struct IsReferenceWrapper
    : xref:bsl/false_type.adoc[bsl::false_type]
----

== Description

This `struct` template implements a boolean metafunction used to detect if the specified `t_TYPE` is a reference wrapper. Clients may specialize this `struct` template to inherit from `bsl::true_type` for `t_TYPE` types that are specializations of `bsl::reference_wrapper`. The behavior is undefined if any other specialization of this `struct` template is defined.

== 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/bslmf/IsReferenceWrapper-01.adoc[`IsReferenceWrapper<bsl::reference_wrapper<T>>`] 
| This partial specialization of `IsReferenceWrapper` derives from `bsl::true_type` for when the (template parameter) type is a `bsl::reference_wrapper`.
|===



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