Re: [boost] Dispatcher Library Initial Implementation

From: Dean Michael Berris (mikhailberis_at_[hidden])
Date: 2006-07-14 12:28:45

On 7/14/06, Kevin Spinar <spinarkm_at_[hidden]> wrote:
> On 7/13/06, Dean Michael Berris <mikhailberis_at_[hidden]> wrote:
> > [snip code]
>
> I'm sorry, but I don't see how this is a big advantage over using a
> std::map<int, boost::function<T> >.
>

Here's a case which is a significant advantage over std::map<int,
boost::function<T> > :

[start code]

struct my_validator {
  bool operator () (const std::string & str) {
    return str.size() >= 5;
  }
};

struct my_router {
  std::string operator() (const std::string & str) {
    std::string temp = "";
    // perform hashing/transformation here
    return temp;
  }
};

// ...
dispatcher <void (std::string), std::string, my_validator, my_router> d;
d["1234"] = void_function_takes_string; // will throw an
invalid_index<std::string> exception
d["12345"] = void_function_takes_string; // will map the callback to the hash
// of "12345" as defined in the router policy
d["23456"]("my string input"); // if "23456" hashes the same as "12345"
// then `void_function_takes_string' is called where "my string input"
// is passed accordingly

[end code]

This is called strategized index validation, and strategized routing
implementation -- both being concepts that will need much
documentation. This is documented in the dispatcher.design.dispatcher
section in the included documentation.

-- 
Dean Michael C. Berris
C/C++ Software Architect
Orange and Bronze Software Labs
http://3w-agility.blogspot.com/
http://cplusplus-soup.blogspot.com/
Mobile: [phone]
Email: dean [at] orangeandbronze [dot] com