optional_unlabeled_tracker.hpp

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/*****************************************************************************
** Ifdefs
*****************************************************************************/

#ifndef TCLAP_OPTIONAL_UNLABELED_TRACKER_H
#define TCLAP_OPTIONAL_UNLABELED_TRACKER_H

#include <string>

namespace ecl {

class OptionalUnlabeledTracker
{

        public:

                static void check( bool req, const std::string& argName );

                static void gotOptional() { alreadyOptionalRef() = true; }

                static bool& alreadyOptional() { return alreadyOptionalRef(); }

        private:

                static bool& alreadyOptionalRef() { static bool ct = false; return ct; }
};


inline void OptionalUnlabeledTracker::check( bool req, const std::string& argName )
{
    if ( OptionalUnlabeledTracker::alreadyOptional() )
        throw( SpecificationException(
        "You can't specify ANY Unlabeled Arg following an optional Unlabeled Arg",
                        argName ) );

    if ( !req )
        OptionalUnlabeledTracker::gotOptional();
}

}; // namespace ecl


#endif