Re: [boost] any_function (callback) library

From: Lie-Quan Lee (llee1_at_[hidden])
Date: 2001-04-09 14:43:24

At Mon, 9 Apr 2001 08:42:48 -0400,
Doug Gregor wrote:
> 
> ------------------------------
> Interface summary:
> 
>   template<typename Result, typename Arg1, typename Arg2, ..., typename ArgN>
>   class any_function
>   {
>     any_function();
>     any_function(const any_function&);
>     template<typename Functor> any_function(Functor);
>     ~any_function();
> 
>     any_function& operator=(const int);  // assignment to zero clears target
>     template<typename Functor> any_function& operator=(Functor);
>     any_function& operator=(const any_function&);
> 
>     void clear(); // clear out the target
> 
>     bool empty() const; // true if no target
>     operator const void*() const; // evaluates true if non-empty
> 
>     Result operator()(Arg1, Arg2, ..., ArgN); // call target
>   };
> -------------------------------
> 
> 	Doug

Here are my two cents:

Could be there is speicalized versions of any_function class which
take a function pointer type template argument and deduce other types
from it ?

template <class Fp>
class any_function<function_traits<Fp>::return_type, 
                   function_traits<Fp>::Arg1,
                   function_traits<Fp>::Arg2,
                   ...>
{
  any_function(Fp fp_);
  
  //...
}

Or maybe a set of functions:

template <class Fp>
function_traits<Fp>::return_type
eval_function(Fp fp);

template <class Fp>
function_traits<Fp>::return_type
eval_function(Fp fp, function_traits<Fp>::Arg1 arg1);

template <class Fp>
function_traits<Fp>::return_type
eval_function(Fp fp, function_traits<Fp>::Arg1 arg1, function_traits<Fp>::Arg2);

//more to take more arguments.

In fact, I am using the latter to create threads in my code.

--
Lie-Quan Lee