[#mp_units-operator_minus-0e]
= xref:mp_units.adoc[mp_units]::operator‐
:relfileprefix: ../
:mrdocs:

Unary minus operator

== Synopsis

Declared in `<mp‐units/constrained.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
constexpr
xref:mp_units/constrained.adoc[constrained<decltype(‐std::declval<T>()), ErrorPolicy>]
operator‐(xref:mp_units/constrained.adoc[constrained] const& x);
----

== Return Value

A transparent wrapper that carries an error policy for domain constraint enforcement.

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

[cols="1,4"]
|===
| Name| Description
| *x*
| The operand
|===


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