[#bsl-function-0a-operator()]
= xref:bsl.adoc[bsl]::xref:bsl/function-0a.adoc[function]::operator()
:relfileprefix: ../../
:mrdocs:

If this object is empty, throw `bsl&colon;&colon;bad&lowbar;function&lowbar;call`&semi; otherwise invoke the target object with the specified `args&period;&period;&period;` and return the result (after conversion to `RET`)&period; Note that, even though it is declared `const`, this call operator can mutate the target object and is thus considered a manipulator rather than an accessor&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using Base::operator();
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