If I have a list of 10 parameters, and all are required,

I end up with a giant block of these:

if(!vm.count("input"))
    {
        std::cout << "Input was not set." << std::endl;
        exit(-1);
    }

Is there a way to do something like:
desc.add_options()
            ("input", po::value<std::string>(&InputFile)->required(), "Set input file.")

That will perform that check for me?

Thanks,

David