RE: [sigc] How to use sigc::bind<>

[Murray Cumming Comneon com]

> [mailto:libsigc-list-admin gnome org] On Behalf Of Jeff Franks
> Martin Schulze wrote:
> 
> >   void bar(int,int);
> >   some_signal.connect(sigc::bind<0>(&bar,10,20));
> >     // binds two arguments at a time
> >
> >   sigc::signal<void,int> other_signal;
> >   other_signal.connect(sigc::bind<0>(&bar,20));
> >     // binds to the last (second) argument of bar
> >   other_signal.connect(sigc::bind<1>(&bar,10));
> >     // binds to the first argument of bar
> >
> This is where I had confusion, bind<0> binds to the last 
> argument, not 
> the first, as zero might imply. I find the explanation bind<0> (zero) 
> binds to the last (second) argument of bar confusing. Compared with 
> bind<1> (first) binds to the first argument of bar, which sounds 
> logical. Initially I thought that the # in bind<#> meant that 
> you could 
> specify which argument position in the bound function the 
> bound argument 
> would be passed to, such as zero for the first, 1 for the 
> second, 2 for 
> the third, etc, like a zero-based index. That would leave bind<#> to 
> create a slot functor with one less argument, based on the remaining 
> arguments, as is required.
> 
> I'm sure this will confuse many programmers.

It confuses me.

Murray Cumming
www.murrayc.com
murrayc usa net