[#mp_units-isnan-00]
= xref:mp_units.adoc[mp_units]::isnan
:relfileprefix: ../
:mrdocs:

Determines if a quantity is a nan.

== Synopsis

Declared in `<mp‐units/math.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    auto R,
    typename Rep>
requires requires(Rep v) { isnan(v); } || requires(Rep v) { std::isnan(v); }
[[nodiscard]]
constexpr
bool
isnan(xref:mp_units/quantity-01.adoc[quantity<R, Rep>] const& a) noexcept;
----

== Return Value

bool: Whether the quantity is a NaN or not.

== Parameters

[cols=2]
|===
| Name
| Description
| *a:*
| Quantity to analyze.
| *a*
| A quantity
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#