Re: [sigc] bind arguments within mem_fun()

[Andreas Matthias <andreas matthias tuwien ac at>]

Martin Schulze wrote:

> Am 01.09.2004 15:50:51 schrieb(en) Andreas Matthias:
>> Is it possible to bind an argument to a function that is referenced
>> by mem_fun()?
> 
> Yes - you can use sigc::bind() (see below).

Oh, I see. I am ashamed. It is mentioned in the docs but I haven't
seen it.

>> 	sigc::mem_fun(*this,
>>  		      boost::bind(&A::foo, boost::ref(*this), 99))();
> 
> The line above doesn't make sense: the call to sigc::mem_fun() is  
> superfluous.
> What you want is:
> 
>   sigc::bind(sigc::mem_fun(&A::foo, *this), 99)();

Yes, that's what I want. :-)
BTW, you have mixed the arguments of mem_fun().

>   sigc::bind(&A::foo, sigc::ref(*this), 99)();

This one doesn't work.

> Note that mixing boost::bind() (and similar stuff) with the sigc API is  
> possible but not recommended because auto-disconnection from signals  
> that you connect to the resulting functors won't work.

I see.

Thanks for your help.

Ciao
Andreas