Hey,
2012/11/27 John Robson <john.rob...@usp.br>:
> WPushButton* pb = new WPushButton(tr("update"));
> pb->clicked().connect(this, &Users::listUpdate);
>
> If I want use Parameters inside listUpdate function:
>
> void Assets::listUpdate(int type, string path) { ... }
>
> I can't do:
> pb->clicked().connect(this, &Users::listUpdate(1, "home"));
>
>
> What I can do? Use a WSignalMapper ? Or is there another better way?
This is the classic Wt FAQ.
The easiest way is to use learn how to use boost::bind() (or c++11
std::bind()). It may be intimidating at first, but once you get it,
it's a simple and versatile tool.
In your case, you would write:
pb->clicked().connect(boost::bind(&User::listUpdate, this, 1, "home"));
Roughly speaking boost::bind(F, a1, a2, a3) will call function F(a1, a2, a3).
Buf if F is a method then the first argument a1 is actually the object
pointer: a1->F(a2, a3).
But boost::bind() is actually a function whose result is a new
function, in a more general way. The example above creates a function
that accepts no parameters. You can still create a function that
accepts parameters using placeholders _1, _2, ... Thus: boost::bind(F,
a1, _1) will call create a function with one parameter _1 which when
invoked, calls function F(a1, _1).
Regards,
koen
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