[#AnnotatedMixin-03-operator_not]
= xref:AnnotatedMixin-03.adoc[AnnotatedMixin]::operator!
:relfileprefix: ../
:mrdocs:

For negative capabilities in the Clang Thread Safety Analysis. A negative requirement uses the EXCLUSIVE_LOCKS_REQUIRED attribute, in conjunction with the ! operator, to indicate that a mutex should not be held.

== Synopsis

Declared in `<sync.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:AnnotatedMixin-03.adoc[AnnotatedMixin] const&
operator!() const;
----

== Return Value

A reference to this mutex, used only for thread‐safety analysis.


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