Boost logo

Boost :

From: Matthew Herrmann (matthew.herrmann_at_[hidden])
Date: 2006-10-19 00:17:32


>
> Message: 11 Date: Thu, 19 Oct 2006 01:52:32 +0200 From: Janek Kozicki
> <janek_listy_at_[hidden]> Subject: Re: [boost] Runtime Dynamic Dispatch
> (boost-dispatch) To: boost_at_[hidden] Message-ID:
> <20061019015232.42b1ce98_at_absurd> Content-Type: text/plain;
> charset=US-ASCII Dean Michael Berris said: (by the date of Wed, 18 Oct
> 2006 22:24:09 +0800)
>> > Hi Everyone,
>> >
>> > I'm about to make a shameless plug about the runtime dispatch library
>> > I've been working on the past few months (mostly testing and using in
>> > a project), which I've uploaded to the vault:
>> > http://tinyurl.com/ycsq6n for everyone to check out and comment on.
>>
>
> can it be used for multimethods ?
Hi Michael,

It looks like the rival for your library is not a switch statement or an
if-else statement, but a hash_map. In your rationale, you should make
clear what your library can do that the following construct cannot:

    template <typename T>
    struct dynamic_dispatcher
    {
        typedef hash_map< T, boost::function<void ()> > type;
    };

    dynamic_dispatcher<int>::type dispatcher;
    dispatcher[0] = boost::bind(&myfun0);
    dispatcher[1] = boost::bind(&myfun1);
    int i;
    std::cin >> i;
    dispatcher[i]()

 From my reading, the only difference is that hash map's operator[] will
not throw in the case where an element is not found.

Best Regards,
Matthew Herrmann
Zomojo Pty Ltd


Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk