[#mp_units-utility-width_checker-operator_call]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/width_checker.adoc[width_checker]::operator()
:relfileprefix: ../../../
:mrdocs:

Validates that `value` is a nonnegative integer and returns it as `unsigned long long`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
[[nodiscard]]
constexpr
unsigned long long
operator()(T value) const;
----

== Return Value

`value` converted to `unsigned long long`

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *value*
| the resolved format argument to validate
|===


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