David Doria wrote:
I looked into the source to see if I could find what the count() function was supposed to be doing, but I actually didn't find a count() function at all?? The usage seems to be "was this parameter set"? But what I'm looking for is "how many times was this parameter set - ie. how many times did I see --list?)
Vladimir, you made it sound like po::parse_command_line does not collapse the multiple parameters, but when you call po::store do they get collapsed?
Yes. po::parse_command_line does not collapse. po::store calls the 'store' method of the value_semantics object associated with the option for each occurrence of --list on the command line, with all the tokens found on the command line. The typed_value class that po::value creates relays to the 'validate' function template. Therefore, if you wish to use 'store' you can either: 1. Introduce your custom class for storing those lists and specialize validate for that class 2. Create your own class derived from value_semantics. (1) is much easier. You can still grab options returned by parse_command_line and process them in a custom way. - Volodya