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# OptionalUnlabeledTracker.h

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    00001
    00002
    00003 /******************************************************************************
    00004  *
    00005  *  file:  OptionalUnlabeledTracker.h
    00006  *
    00007  *  Copyright (c) 2005, Michael E. Smoot .
    00008  *  All rights reverved.
    00009  *
    00010  *  See the file COPYING in the top directory of this distribution for
    00011  *  more information.
    00012  *
    00013  *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00014  *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00015  *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00016  *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00017  *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00018  *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00019  *  DEALINGS IN THE SOFTWARE.
    00020  *
    00021  *****************************************************************************/
    00022
    00023
    00024 #ifndef TCLAP_OPTIONAL_UNLABELED_TRACKER_H
    00025 #define TCLAP_OPTIONAL_UNLABELED_TRACKER_H
    00026
    00027 #include <string>
    00028
    00029 namespace TCLAP {
    00030
    00031 class OptionalUnlabeledTracker
    00032 {
    00033
    00034     public:
    00035
    00036         static void check( bool req, const std::string& argName );
    00037
    00038         static void gotOptional() { alreadyOptionalRef() = true; }
    00039
    00040         static bool& alreadyOptional() { return alreadyOptionalRef(); }
    00041
    00042     private:
    00043
    00044         static bool& alreadyOptionalRef() { static bool ct = false; return ct; }
    00045 };
    00046
    00047
    00048 inline void OptionalUnlabeledTracker::check( bool req, const std::string& argName )
    00049 {
    00050     if ( OptionalUnlabeledTracker::alreadyOptional() )
    00051         throw( SpecificationException(
    00052     "You can't specify ANY Unlabeled Arg following an optional Unlabeled Arg",
    00053                     argName ) );
    00054
    00055     if ( !req )
    00056         OptionalUnlabeledTracker::gotOptional();
    00057 }
    00058
    00059
    00060 } // namespace TCLAP
    00061
    00062 #endif