[#absl-AlphaNum-2constructor-0f8]
= xref:absl.adoc[absl]::xref:absl/AlphaNum.adoc[AlphaNum]::AlphaNum
:relfileprefix: ../../
:mrdocs:

Constructs an `AlphaNum` from a `std::vector<bool>` element reference.

== Synopsis

Declared in `<absl/strings/str_cat.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
requires std::is_class_v<T> &&
          (std::is_same_v<T, std::vector<bool>::reference> ||
           std::is_same_v<T, std::vector<bool>::const_reference>)
AlphaNum(T e);
----

== Description

`vector<bool>::reference` and `const_reference` require special help to convert to `AlphaNum` because it requires two user defined conversions.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| The bit reference to convert.
|===


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