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Thank you Koen.
I study about std::bind (function and placeholders). Very useful.
Now is working perfectly.
On 11/27/2012 03:18 AM, Koen Deforche wrote:
> 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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- --
John Robson <john.rob...@usp.br> * Universidade de São Paulo - USP
Conheça o Ubuntu: www.youtube.com/watch?v=fYbiH8lXQZM
Participe do Projeto: http://boinc.berkeley.edu
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