Dean Michael Berris wrote:
On 6/8/06, Peter Dimov <pdimov@mmltd.net> wrote:
Dean Michael Berris wrote:
//set up a registry dispatch::dispatcher<void (), int> callbacks;
// register a nullary free function f to index 0 callbacks[0] = f;
// bind arguments to a single argument function p to index 1 callbacks[1] = boost::bind(p, 1);
// get user input then execute appropriate callback int i; cin >> i; callbacks[i](); This can be done with map< int, function<void()> >.
Yes, this is just one of the things that the dispatcher can do. The current implementation (lacking documentation) can be downloaded from http://tinyurl.com/px33v --
Well documentation would be what most of use would really like to see :-) Some days ago I rewrote a message dispatching system that has similar interface to what you present, and implemented on top of Boost.Signals. Some examples: struct is_equal_message : message< is_equal_message, boost::tuple<int,bool> bool (int, double)
{}; namespace { is_equal_message cosnt & is_equal = is_equal_message::get(); } struct is_even_message : message< is_even_message, boost::tuple<int> bool (int) {}; namespace { is_even_message cosnt & is_even = is_even_message::get(); }
bool my_equal(int a, double b) { return double(a) == b; } bool my_even(int a) { return a%2 == 0; } int main (int arc, char** argv) { dispatcher d; d << is_equal[1,true].connect(boost::bind(my_equal,_2,_3)) << is_equal[1,false].connect(boost::bind(my_equal,_3,_2)) << is_even[1].connect(boost::bind(my_even,_2)); std::cout << ( d[is_equal,1,true](12,12) ? "T" : "F" ) << ( d[is_equal,1,false](12,3.14) ? "T" : "F" ) << ( d[is_even,1](2) ? "T" : "F" ) << ( d[is_even,1](1) ? "T" : "F" ) << std::endl; return 0; } Does your code support such varied registration and dispatching?
there are a few other uses, including a means for defining a strategy for index validation. An example of this usage is shown below (and can also be seen from the unit test): [...] typedef dispatch::dispatcher<int(), int, require_even_strategy, std::vector> dispatcher_t;
Hm, now that's an interesting idea, contract based dispatch interfaces. -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo