Re: [boost] new utility: function parameter caster

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-12-09 17:50:02

ali f wrote:
> Hi again,
>
> ok, here's my actual real world situation:
>
> win->on_mouse_move.connect(
>     args_cast<2, bool(int,int,bool,int)>( (
>         lambda::var(x) = lambda::_1,
>         lambda::var(y) = lambda::_2,
>         true
>     ) )
>     );

The following:

win->on_mouse_move.connect(
     (
         lambda::var(x) = lambda::_1,
         lambda::var(y) = lambda::_2,
         lambda::_4,
         true
     )
);

would be Lambda's way to make it accept four arguments and only use the 
first two; it doesn't subscribe to boost::bind's philosophy of automatically 
ignoring extra arguments. Unfortunately, Lambda doesn't have _4, which makes 
the suggested workaround a bit limited. :-)

Your attempt at using boost::bind with it didn't work probably because you 
didn't specify a return type. Try boost::bind<bool>.