Re: [Boost-Users] Re: boost::function Usage Question

From: Albrecht Fritzsche (albrecht.fritzsche_at_[hidden])
Date: 2002-08-13 02:31:19

Edward Diener wrote:
>>class Publisher {
>>   typedef boost::function<void> Function;
>>public:
>>   void SetChecker(const Function& Callback){ }
      void Publish(){}
>>};
>>
>>class Manager {
>>public:
>>   Manager();
>>private:
>>   void Check() {}
>>};
>>
>>Manager::Manager()
>>{
>>   Publisher d;
>>   d.SetChecker(std::mem_fun(&Manager::Check));

> try: 
>       d.SetChecker(boost::bind(&Manager::Check,this));

Brilliant - thanks! Would you mind giving me a short
rationale about this, since I am a newbie regarding
function pointers and function (object?) adaptors.

SO, if using an stl algorithm like

   vector<Publisher> p;
   for_each(p.begin(), p.end(), mem_fun(&Publisher::Publish));

I don't have to bind anything, do I? mem_fun() returns a
mem_fun_t functor object, which will receive the Publisher
object pointer through each intern for_each call?

And that object pointer passing was missing in my code and
was achieved in your code through the binding? I had already
looked at boost::bind but still cannot figure out its interface

   template<class F, class A1> unspecified-3-1 bind(F f, A1 a1);

What is this returning?

Thanks again
Ali