Hi, I am trying to use program_options to parse suboptions: Command –S “-a 1 –b test –c 1.2” (the suboptions in –S are to be passed into other programs) Using the example source code, I tried something like the code below, but get the following error The argument (‘ 1’) for option ‘—TestA’ is invalid. Apparently the space between –a and 1 is treated as part of the argument and thus will not convert to an integer. I tried at the top argument level (e.g. command –M 1) and it works as expected, so something about creating the vector of suboptions is confusing program_options. Any suggestions? Thanks very much. options_description desc("Allowed options"); desc.add_options()("subopt,S",value<string>(),"Sub Options"); variables_map vm; store(command_line_parser(ac, av).options(desc).run(), vm); vm.notify(); if (vm.count("subopt")) { string substring=vm["subopt"].as<string>(); boost::regex re("\\s+(?=-)"); boost::sregex_token_iterator i(substring.begin(), substring.end(), re, -1); boost::sregex_token_iterator j; vector<string> splitResults; copy(i,j,back_inserter(splitResults)); int ta; string tb; float tc; options_description subopt_desc("Suboptions"); subopt_desc.add_options() ("TestA,a", value<int>(&ta)->default_value(0), "integer") ("TestB,b",value<string>(&tb),"string") ("TestC,c",value<float>(&tc), "float") ; variables_map subopt_vm; store(command_line_parser(splitResults).options(subopt_desc).run(), subopt_vm); subopt_vm.notify(); cout<<"a="<<ta<<endl; cout<<"b="<<tb<<endl; cout<<"c="<<tc<<endl; } -- http://www.fastmail.fm - Choose from over 50 domains or use your own