[Boost-users] program_options Parsing Suboptions

Subject: [Boost-users] program_options Parsing Suboptions
From: Robert (robertln_at_[hidden])
Date: 2014-09-14 17:17:43

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;

        }

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