[#BloombergLP-bslstl-Function_Variadic-08-operator_call]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Function_Variadic-08.adoc[Function_Variadic<RET(ARGS...)>]::operator()
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If this object is empty, throw `bsl::bad_function_call`; otherwise invoke the target object with the specified `args...` and return the result (after conversion to `RET`). 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.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
RET
operator()(ARGS... args) const;
----


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