[#bsl-is_const-00]
= xref:bsl.adoc[bsl]::is_const
:relfileprefix: ../
:mrdocs:

This `struct` template implements the `is_const` meta‐function defined in the C++11 standard [meta.unary.cat]to determine if the (template parameter) `t_TYPE` is `const`‐qualified. This `struct` derives from `bsl::true_type` if the `t_TYPE` is `const`‐qualified, and `bsl::false_type` otherwise. Note that this generic default template derives from `bsl::false_type`. A template specialization is provided (below) that derives from `bsl::true_type`.

== Synopsis

Declared in `<bslmf_isconst.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
struct is_const
    : 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_const-0b.adoc[`is_const<t_TYPE const>`] 
| This partial specialization of `is_const`, for when the (template parameter) `t_TYPE` is `const`‐qualified, derives from `bsl::true_type`.
|===



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