

/******************************************************************************
 *
 *  file:  OptionalUnlabeledTracker.h
 *
 *  Copyright (c) 2005, Michael E. Smoot .
 *  All rights reverved.
 *
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *
 *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 *
 *****************************************************************************/


#ifndef TCLAP_OPTIONAL_UNLABELED_TRACKER_H
#define TCLAP_OPTIONAL_UNLABELED_TRACKER_H

#include <string>

namespace TCLAP
{

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 TCLAP

#endif
