THUAI6/CAPI/cpp/tclap/include/tclap/OptionalUnlabeledTracker.h

// -*- Mode: c++; c-basic-offset: 4; tab-width: 4; -*-

/******************************************************************************
 *
 *  file:  OptionalUnlabeledTracker.h
 *
 *  Copyright (c) 2005, Michael E. Smoot .
 *  All rights reserved.
 *
 *  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