[#mp_units-utility-width_checker]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::width_checker
:relfileprefix: ../../
:mrdocs:

A `Handler` for xref:mp_units/utility/handle_dynamic_spec.adoc[`handle_dynamic_spec`] that validates and extracts a `width` argument.

== Synopsis

Declared in `<mp‐units/utility/format.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct width_checker;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/utility/width_checker/operator_call.adoc[`operator()`] 
| Validates that `value` is a nonnegative integer and returns it as `unsigned long long`.
|===



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