/******************************************************************************
 *
 *  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 <tclap/ArgException.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();
		}
	}
}

#endif