Function getKeys

pdal/Options.hpp:200–210

    }

    StringList getKeys() const
    {
        StringList keys;

        for (auto it = m_options.begin(); it != m_options.end();
            it = m_options.upper_bound(it->first))
        {
            keys.push_back(it->first);
        }
        return keys;
    }

    std::vector<Option> getOptions(std::string const& name="") const;
    StringList toCommandLine() const;