OptionalUnlabeledTracker.h

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// -*- 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 <tclap/ArgException.h>
 
#include <string>
 
namespace TCLAP {
 
// Legacy static helper retained for source compatibility. Built-in positional
// arguments are validated at registration by their CmdLine, not by this helper.
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  // TCLAP_OPTIONAL_UNLABELED_TRACKER_H