[#BloombergLP-bslstl-Function_InvokerUtilNullCheck-09-isNull]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Function_InvokerUtilNullCheck-09.adoc[Function_InvokerUtilNullCheck<bsl::function<PROTO>>]::isNull
:relfileprefix: ../../../
:mrdocs:

Return true if the `bsl::function` specified by `f` is empty; else false.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
isNull(xref:bsl/function-0a.adoc[bsl::function<PROTO>] const& f);
----


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