[#BloombergLP-bslstl-Function_InvokerUtilNullCheck-09]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Function_InvokerUtilNullCheck-03.adoc[Function_InvokerUtilNullCheck]<xref:bsl/function-0a.adoc[bsl::function<PROTO>]>
:relfileprefix: ../../
:mrdocs:

Specialization of null checker for instantiations of `bsl::function`. This specialization treats an empty `bsl::function` as a null object.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class PROTO>
struct xref:BloombergLP/bslstl/Function_InvokerUtilNullCheck-03.adoc[Function_InvokerUtilNullCheck]<xref:bsl/function-0a.adoc[bsl::function<PROTO>]>;
----

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_InvokerUtilNullCheck-09/isNull.adoc[`isNull`] 
| Return true if the `bsl::function` specified by `f` is empty; else false.
|===



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