[#BloombergLP-bslstl-Function_Variadic-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Function_Variadic
:relfileprefix: ../../
:mrdocs:

This component‐private class template contains the physical representation and provides the variadic interfaces for `bsl::function`.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class PROTOTYPE>
class Function_Variadic;
----

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_Variadic-08.adoc[`Function_Variadic<RET(ARGS...)>`] 
| This component‐private class template contains the physical representation and provides the variadic interfaces for `bsl::function` (see class and component documentation for `bsl::function`). `bsl::function` publicly inherits from an instantiation of this template. This implementation class exists to 1) minimize the amount of variadic template expansion required in C++03 using the `sim_cpp11_features.pl` utility and 2) work around issues with the Sun CC compiler, which has trouble with argument type deduction when a template argument has a partial specialization (as `Function_Variadic` does). `bsl::function` does not have a partial specialization and delegates to the `Function_Variadic` base class only those parts of the interface and implementation that depend on decomposing the function prototype into a return type and variadic list of argument types.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:bsl/function-0a.adoc[`function`] 
| Forward declaration.
|===


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