Re: [Cppcms-users] Plugins and templates

[Julian P. <ju...@wh...>]

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Am 19.08.2010 12:35, schrieb Artyom:

> What you need is something like this with smart pointers:
> 
>  class IPlugin  {
>      public:
>      virtual booster::shared_ptr<content::master> handleRequest() const = 0;
>  };
>  class  HelloPlugin: public IPlugin {
>       public:
>      virtual booster::shared_ptr<content::master> handleRequest()  {
>          booster::shared_ptr<content::hello_plugin>  hp(new 
> content::hello_plugin);
>          hp->title =  "Hello";
>          hp->message =  "World";
>          return  hp;
>      }
>  }
> 
>  void  myapp::dispatcher(std::string module) {
>      IPlugin p =  plugcontainer.getPluginByModule(module);
>      booster::shared_ptr<content::master> m  = p.handleRequest();
>       render("hello_plugin",*m);
>  }
> 

The problem is, this doesn't work either, still getting std::bad_cast
exceptions. It works only if you cast the shared_ptr to
content::hello_plugin by dynamic_pointer_cast before passing it to
render(). And that's the point - the dispatcher does not know which
class to cast to.

My other idea of the plugin implementing a method returning a subclass
of cppcms::application seems more promising.
The only problem I have now, that at compile time I get a forward
declaration error in cppcms/application.h for cppcms::url_dispatcher
when I insert a dispatch() statement into the constructor of the
cppcms::application.

Is there a way to fix that? Where does this problem come from?

Thanks,
Julian
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