Re: [boost] Pointers to functors with boost::function?

From: Dirk Gerrits (dirkg_at_[hidden])
Date: 2002-05-23 05:35:59

----- Original Message ----- 
From: "Yitzhak Sapir" <yitzhaks_at_[hidden]>

> boost::ref is a class generator that creates a reference wrapper.  
> operator() is not defined for the wrapper.  

Suppose you have an object r of a type generated by boost::ref for an
object of type T. (That's boost::reference_wrapper<T> right?)
Now let's say we have this line of code:
r();
boost::reference_wrapper<T> has no operator() but it does have an 
implict conversion to T&. If that type T does have an operator() taking
no arguments, wouldn't the above code be perfectly legal?

I have tried the following on my compiler and it worked perfectly:

#include <boost/function.hpp>
#include <boost/ref.hpp>

void func(boost::function0<void> f) { f(); }

struct functor
{
  void operator()() {std::cout << "It works!" << std::endl; }
};

int main()
{
  functor f;
  func(f);
  func(boost::ref(f));
}

Output: 
It works!
It works!

If this doesn't work for you, then is my logic (and my compiler) flawed?

Dirk Gerrits