Hi, Multiple occurrences are definitely allowed and handled. If you do specify the option value to populate a container, and then pass the containerpointer to the add_options() method, you can later iterate over the options. For e.g, in class cmdLineParser{ ... private: vector<string>* _sources; } In cmdLineParser.cpp, parse(int argc, char* argv[]) { po::options_description genericDesc("Generic"); genericDesc.add_options() ("help", "Help Message") ("source,s", value(_sources), "source node name") ; store(parse_command_line(argc,argv, genericDesc),_vm); .... } good luck, -Harsh Deshmane On Wednesday 16 August 2006 17:03, Ian McCulloch wrote:

Hi,

I have spent several hours looking at the docs and sources, but I cannot figure out how to allow multiple occurances of an option. Many unix tools allow you to specify the --verbose option multiple times, to mean increasing verbosity of output, and I want to replicate this behaviour.

Does this require writing a new class derived from value_semantic, that combines the behaviour of bool_switch() and typed_value<std::vector<bool>> ? I'm not sure how to go about doing that.

It is a very useful lib, but I do wish (often!) there was some real reference docs (aside from the doxygen stuff and comments in the sources themselves, which isn't enough :-(

Unrelated, but in trying to figure this out from the docs, I noticed in the overview.html, in the Syntactic Information there is a call to a function value<string>()->implicit(). However typed_value<T> has no such member function. Maybe it is left over from a previous design iteration or something, as there is a member variable m_implicit but it is never initialized or accessed.

Cheers, Ian McCulloch

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