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base.CommandLineTraits.h

/*----------------------------------------------------------------------------
  SWORD 2000 - Software With Objects for Rapid Development
  Copyright (C) 2003 Eric NICOLAS
  ----------------------------------------------------------------------------
  SWORD is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  SWORD is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with SWORD; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  --------------------------------------------------------------------------*/
#ifndef _SWORD_BASE_COMMANDLINETRAITS_
#define _SWORD_BASE_COMMANDLINETRAITS_

namespace sword {


        template<typename T>
        class CommandLineTraits {
        public:
                static T    convert(const std::string &value);
                static void toggle(T &value, bool onoff);
        };

        // template specialisation on std::string
        template<>
        class CommandLineTraits<std::string> {
        public:
                static std::string convert(const std::string &arg) { return arg; }
                static void toggle(std::string &/*arg*/, bool /*onoff*/) {}
        };

        // template specialisation on int
        template<>
        class CommandLineTraits<int> {
        public:
                static int convert(const std::string &arg) { return strtol(arg.c_str(), NULL, 0); }
                static void toggle(int &/*value*/, bool /*onoff*/) {}
        };

        // template specialisation on bool
        template<>
        class CommandLineTraits<bool> {
        public:
                static bool convert(const std::string &arg)
                {
                        if (arg[0] == 'f' || arg[0] == 'F' || arg[0] == '0') return false;
                        return true;
                }
                static void toggle(bool& arg, bool onOff) { arg = onOff; }
        };

} // namespace sword

#endif // _SWORD_BASE_COMMANDLINETRAITS_

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