Re: [boost] Dynamic Overloads [ was Re: Runtime Dynamic Dispatch Library (0.2)]

From: Marco Costalba (mcostalba_at_[hidden])
Date: 2007-10-01 02:07:26

On 10/1/07, Joel de Guzman <joel_at_[hidden]> wrote:
> Joel de Guzman wrote:
>
> Hence, I'd like to propose an extension (or a separate library)
> for allowing overloads for boost.function. The example above can
> be declared as:
>
>      boost::overload<
>          std::string(std::string, std:string)
>        , std::string(std::string, char)
>        , std::string(std::string, char const*)
>        , std::string(char, std::string)
>        , std::string(char const*, std::string)
>      >
>      concat;
>

Or possibly (perhaps)

typedef fusion::vector<
          std::string(std::string, std:string)
        , std::string(std::string, char)
        , std::string(std::string, char const*)
        , std::string(char, std::string)
        , std::string(char const*, std::string)
      > overloads_sequence;

boost::overload<overloads_sequence> concat;

Just one question. Is it possible, given a class T to deduce its
implicit convrsions?

As example

class A {
 A();
 A(const A&) ;
 A(int);
 explicit A(double);
};

typedef implicit_conversions<A> implicits;

where 'implicits' is, as example, fusion::vector<void, int, double, const A&>

Thanks
Marco