[#bsl-is_void-06]
= xref:bsl.adoc[bsl]::is_void
:relfileprefix: ../
:mrdocs:

This `struct` template implements the `is_void` meta‐function defined in the C++11 standard [meta.unary.cat]to determine if the (template parameter) `t_TYPE` is the (possibly cv‐qualified) `void` type. This `struct` derives from `bsl::true_type` if `t_TYPE` is the `void` type, and `bsl::false_type` otherwise.

== Synopsis

Declared in `<bslmf_isvoid.h>`

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

== Base Classes

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

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:bsl/is_void-03.adoc[`is_void<void>`] 
| This partial specialization of `is_void` derives from `bsl::true_type` for when the (template parameter) `t_TYPE` is `void`.
| xref:bsl/is_void-0b.adoc[`is_void<void volatile>`] 
| This partial specialization of `is_void` derives from `bsl::true_type` for when the (template parameter) `t_TYPE` is `volatile void`.
| xref:bsl/is_void-0e.adoc[`is_void<void const>`] 
| This partial specialization of `is_void` derives from `bsl::true_type` for when the (template parameter) `t_TYPE` is `const void`.
| xref:bsl/is_void-09.adoc[`is_void<void const volatile>`] 
| This partial specialization of `is_void` derives from `bsl::true_type` for when the (template parameter) `t_TYPE` is `const volatile void`.
|===



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