Mailinglist Archive: zypp-devel (56 mails)

["Duncan Mac-Vicar P." <dmacvicar@xxxxxxx>]

On Tuesday 04 December 2007 05:54:04 pm Ladislav Slezak wrote:
> Hello all,
>
> I'm improving callback implementation in pkg-bindings,
> I'd like to add a total progress and the callbacks should be displayed
> in the main dialog (instead of popups).
>
> I'm reusing zypp::ProgressData class with zypp::CombinedProgressData class
> which provides a sub progress for a sub task. That's nice.
>
> But I have a problem, I can register only
>   bool function(const zypp::ProgressData&)
> as the receiver function, I'd like to register
>   bool MyClass::function(const zypp::ProgressData&)

Hi Ladislav

Well, you can't register a function of a class because if the function is not 
static, you actually need an instance of the class.

The solution for this is to use boost::bind, which we use a lot in ZYpp. If 
you look at the YUM parser code, which uses callbacks a lot for data 
consuming, you can use boost bind to get a functor object using it like this:

bind(&RepoParser::Impl::repomd_CB, this, _1, _2));

That means, use the repomd_CB function of that class, on the this object, and 
then the parameters order (you can even invert or ignore parameters when 
binding), the result of that expression is a functor you can use in place of 
any functor, so you can set the ProgressData progress callback to the result 
of a bind expression.

Don't hesitate to ask again in doubt! boost is tricky,

Duncan
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