[#bsl-operator_not_eq-006]
= xref:bsl.adoc[bsl]::operator!=
:relfileprefix: ../
:mrdocs:

Return `true` if the specified `function` is not empty.

== Synopsis

Declared in `<bslstl_function.h>`

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

== Return Value

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

== Parameters

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


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