id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
13114,Multiple signatures for function,stinkingmadgod@…,Douglas Gregor,"I am not familiar with boost, just wanted to suggest the possibility of having `function` take multiple signatures

{{{#!c++
function<void (int), int (double)> f;
}}}

This is compatible with `std::function`, but unknown feasibility for `boost::function` in its current form.

The key idea is to recursively implement `operator()` from the argument list

{{{#!c++
template<typename Ret, typename... Args, typename... Fns>
struct erasure_base<Ret (Args...), Fns...> : erasure_base<Fns...>
{
    virtual Ret operator()(Args&&...) = 0;
    using erasure_base<Fns...>::operator();
};
}}}

Attached file is a proof-of-concept implementation of such functionality.",Feature Requests,new,To Be Determined,function,Boost 1.63.0,Not Applicable,,,