Re: [Boost-users] Boost function question.

From: Kirit Sælensminde (kirit.saelensminde_at_[hidden])
Date: 2007-09-05 01:02:05

Surya Kiran Gullapalli wrote:
> template <class T>
> class TemplatedClass
> {
> 	TemplatedClass ()
> 	{
> 		member = shared_ptr<T> (CreateA()) ;
> 	}
> 
> 	private:
> 		shared_ptr<T> member ;
> 
> 	operator->()
> 	{ return T.get() ; }
> } ;
> 
> class BasePlugin
> {
> 	virtual void foo (void) = 0 ;
> }
> 
> class DerivedPlugin_A : public BasePlugin
> {
> 	virtual void foo (void)
> 	{ cout << "FOO in derived A" << endl ;}
> } ;
> 
> DerivedPlugin_A* CreateA ()
> {
> 	return new DerivedPlugin_A ;
> }
> 
> TemplatedClass <BasePlugin> t ;
> t->foo() ;
> 
> How do i write a boost::function wrapper for t->foo() ;

As far as I understand it you need to double nest the binds. Using 
Boost.Lambda it would be something like this:

boost::lambda::bind( &BasePlugin::foo, boost::lambda::bind( 
&TemplatedClass< BasePlugin >::operator->, t ) )

This expression should give you a boost::function< void ( void ) >.

K