OptionsRegex.h

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#ifndef __OptionsRegex_H__
#define __OptionsRegex_H__
 
#include <regex>
#include <Options.h>
 
namespace options {
    template <> class single<std::regex>:
        public std::regex,
        public internal::typed_base<std::regex, true>,
        public originalStringKeeper {
        typedef std::string rangeValueType;
        std::regex::flag_type regexOption;
      public:
        single(char aShortName, const std::string& aLongName, const std::string& aExplanation, const std::string& aDefault = "", std::regex::flag_type aRegexOption = std::regex::ECMAScript) :
            internal::typed_base<std::regex, true>(aShortName, aLongName, aExplanation, 1),
            regexOption(aRegexOption) {
            if (! aDefault.empty() ) {
                assign(aDefault, std::regex::optimize | regexOption);
            }
            lOriginalString = aDefault;
        }
        void fSetMe(std::istream& aStream, const internal::sourceItem& aSource) override {
            using escapedIO::operator>>;
            aStream >> lOriginalString;
            assign(lOriginalString, std::regex::optimize | regexOption);
            fSetSource(aSource);
        }
        void fCheckRange() const override {
            return;
        }
        void fAddDefaultFromStream(std::istream& aStream) override {
            std::getline(aStream, lOriginalString);
            assign(lOriginalString);
        }
        void fWriteValue(std::ostream& aStream) const override {
            aStream << lOriginalString;
        }
    };
 
}
 
#endif