Re: [Boost-users] program_options: Make PO not eat argc

Subject: Re: [Boost-users] program_options: Make PO not eat argc
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2014-10-08 04:43:24

On 10/08/2014 10:54 AM, Florian Lindner wrote:
> Hello,
>
> I have a couple of libraries (MPI, petsc) that also consume my applications
> argc and argv, which is parsed with boost::program_options before.
>
> po seems to eat up argv, i.e. removes all items that it handles. Can I
> disable that behavior somehow so that po does not touch argc/argv. Or do I
> need to recreate it, e.g. using collect_unrecognized?

Florian,

this is not expected. Here's the code for parsing:

        cmdline::cmdline(int argc, const char*const * argv)
             {
        #if defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS)
                 vector<string> args;
                copy(argv+1, argv+argc+!argc, inserter(args, args.end()));
                 init(args);
        #else
                 init(vector<string>(argv+1, argv+argc+!argc));
        #endif
             }

So the argc/argv is immediately converted into vector, which is parsed. Can you reproduce this
problem in a simple example?

- Volodya