Re: [Boost-users] Bind/Function: use reference arguments in template variadic functions

Subject: Re: [Boost-users] Bind/Function: use reference arguments in template variadic functions
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2013-04-12 17:55:11

On Fri, Apr 12, 2013 at 2:37 PM, Yannick POTIN <yannp63_at_[hidden]> wrote:

>
>
> template<class ...classes>
>
> boost::function0<void> call_something(classes&... c)
>
>
> Thank you, It actually allows me to use references in these functions.
>
> I just tried and g++ is waiting for only references but I need to use
> pointers and/or values too.
>
> There is a way to use mixed types in template variadic functions ?
>
>
>
> For perfect forwarding use:
>
> template<class... T>
> void call(T&&... t)
> {
>    foo(std::forward<T>(t)...);
> }
>
>
> I tried this one too and it works fine thank you.
>
> However, I use these functions with boost::bind library and actually
> references
> are lost when I use it (and I need to). After some google searches, it
> seems that
> boost::bind officially does not support this use (due to internal
> references).
> So I tried with std::bind because I read somewhere the problem was fixed
> with its C++11 version.
> The problem is the same : with std::bind too, references are lost using
> std::forward.
>
> Does anyone made this duo bind/template variadic functions working
> together ?
> And if someone did, how did you do ?
>

Sorry, I lost context with what you're trying to do, but maybe you want to
use boost::ref / std::ref in conjunction with boost::bind / std::bind,
respectively? I think that should indicate to the binding framework to hold
the bound values by reference rather than by value (if that's what you
want).

- Jeff