Re: [boost] new utility: function parameter caster

From: ali f (k9eks_at_[hidden])
Date: 2006-12-09 05:48:50

I had already tried it with the explicit return type. Doesnt work with that 
either. Steven Watanabe hit the spot though, the addition of unlambda did 
it. I suppose it's how boost.signals handles the function calls...

thanks guys

- ali

----- Original Message ----- 
From: "Peter Dimov" <pdimov_at_[hidden]>
Newsgroups: gmane.comp.lib.boost.devel
Sent: Sunday, December 10, 2006 6:24 AM
Subject: Re: new utility: function parameter caster

> Steven Watanabe wrote:
>
>> Even that isn't enough. You need:
>>    win->on_mouse_move.connect(
>>    boost::bind<bool>( unlambda((
>
> 'unlambda' would be necessary with boost::lambda::bind, but it isn't 
> needed
> for boost::bind. The following works for me.
>
> #include <boost/lambda/lambda.hpp>
> #include <boost/bind.hpp>
> #include <boost/function.hpp>
> #include <iostream>
>
> int main()
> {
>    int x = 0, y = 0;
>
>    boost::function< bool( int, int, bool, int ) > on_mouse_move;
>
>    namespace l = boost::lambda;
>
>    on_mouse_move = boost::bind<bool>( (l::var(x) = l::_1, l::var(y) =
> l::_2, true), _1, _2 );
>
>    on_mouse_move( 1, 2, true, 4 );
>
>    std::cout << x << ' ' << y << std::endl;
> }
>
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