Pavol Droba wrote: > Ok, I think, I see now, where the point is. > > The framework is separated into two layers. > > L1: option level ( string and boost::any oriented, defined by > option_description ) L2: typed-paramter level ( represented by > po::parameter function ) > > L2 should work above the L1 as an optional feature > Currenlty L1 is quite well defined, but L2 is lacking. > > I would like if L2 would be able to convert a string representation > to given type, run the typed validation and store the value into local > variable. Conversion and validation should be parametric with reasonable > defaults. Also, I think that the conversion and validation should be > separated. Conversion should deal with a format of a parameter, while the > validation should check semantic properties of its value.
I completely agree. Basically, this means splitting the current "validator" in two, as your describe above. Plus some polishing of interaction between 'convert'/'interprepter' -- for string->type conversion 'validator' -- for checking the value of desired type 'notifier' -- which does storing into local variables > Important is, that L2 should be separated from L1. So L2 conversion and > validation would be different from L1. Actually, L2 validation and > conversion should plug into L1 as a custom validator. > > I hope this makes some sense. po::parameter ( aka L2 ) is quite close to > the goal, but there are still some missing parts. Yep, that makes complete sense. By default, L1 simply converts strings from command line to strings inside variables_map. The converts/validators that come from L2 make it behave in more usefull way. Do you think those levels must be explicitly written down in docs? >> I've also realized there are no examples for custom validator now, so >> this code will most likely be added to the library. >> > > Thanks for the example. It should definitely become a part of the > documentation. Consider it added. Thanks, Volodya _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
