[#bsl-function-066]
= xref:bsl.adoc[bsl]::xref:bsl/function-0a.adoc[function<PROTOTYPE>]
:relfileprefix: ../
:mrdocs:

Deduce the template parameter `PROTOTYPE` from the signature of the `operator()` of the functor supplied to the constructor of `function`.

== Synopsis

Declared in `<bslstl_function.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class ALLOC,
    class FP,
    class PROTOTYPE = FunctionDeductionHelper::StripSignature<decltype(&FP::operator)>::Sig>
xref:bsl/function-0a.adoc[function<PROTOTYPE>](
    std::allocator_arg_t,
    ALLOC,
    FP) -> xref:bsl/function-0a.adoc[function<PROTOTYPE>];
----


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