[#bsl-operator_not_eq-0b]
= xref:bsl.adoc[bsl]::operator!&equals;
:relfileprefix: ../
:mrdocs:

Return `true` if the specified `function` is not empty&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;function&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class PROTOTYPE&gt;
bool
operator!&equals;(
    xref:bsl/function-0a.adoc[function&lt;PROTOTYPE&gt;] const& f,
    xref:bsl/nullptr_t-08.adoc[nullptr&lowbar;t] unused) noexcept;
----

== Return Value

`true` if `f` is not empty, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *f*
| function object to compare with null
| *unused*
| null pointer literal
|===


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