Re: [boost] Overloading a function taking a boost::function

From: Giovanni Bajo (giovannibajo_at_[hidden])
Date: 2002-05-11 05:34:45

----- Original Message -----
From: "Dirk Gerrits" <dirkg_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Saturday, May 11, 2002 12:08 PM
Subject: [boost] Overloading a function taking a boost::function

> So I was wondering if Boost contains a function like this? Or if you know
> of different methods to accomplish this task. (I haven't been able to come
> up with any so far. :(

There are methods that work for normal functions but will fail on any other
type of "functors". For example, you can use partial template specializion:

template <typename FUNC>
struct ArietyTrait;

template <typename R>
struct ArietyTrait<R (*)(void)>
{
  // ....
};

template <typename R, typename P1>
struct ArietyTrait<R (*)(P1)>
{
  // ....
};

template <typename R, typename P1, typename P2>
struct ArietyTrait<R (*)(P1, P2)>
{
  // ....
};

With this trait, you can match functions with 0, 1, 2, etc parameters.

Giovanni Bajo