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 ) ) ); on_mouse_move is a boost.signal. I want to use lambda because it's a simple thing to do. I just want to change some local variables according to where the mouse moves in my window. on_mouse_move is called everytime there's a mouse move (duh). So anyway, I can do the above with args_cast, I can't get it working with bind: win->on_mouse_move.connect( boost::bind( ( lambda::var(x) = lambda::_1, lambda::var(y) = lambda::_2, true ), _1, _2 ) ); I tried it with a templated function object call, ie the following works template< class F > void call( F f ) { int a = 1, b = 2, c = 3, d = 4; //f( 1, 2, 3, 4 ); f(a, b, c, d); } call( boost::bind( &draw, _1, _2 ) ); But it seems like it doesn't make sence or something... ----- Original Message ----- From: "Peter Dimov" <pdimov@mmltd.net> Newsgroups: gmane.comp.lib.boost.devel Sent: Saturday, December 09, 2006 5:44 PM Subject: Re: new utility: function parameter caster Hervé Brönnimann wrote:
Indeed, I tried and to my surprise it doesn't work (both boost::bind (&draw, _1, _2)(1,2,3,4) and boost::bind<void>(&draw, _1, _2)(1,2,3,4)).
Calling bind with (1, 2, 3, 4) doesn't work for you because of the rvalues. It works with the latest CVS HEAD. You don't even need the & in front of draw. boost::bind has been allowing extra arguments since day one. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost