LexicalToolKit.h

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/***************************************************************************
 *
 * Copyright (C) 2009-2010 Cassio Neri Moreira
 *
 * This file is part of the KeyValue library.
 *
 * The KeyValue library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * The KeyValue library 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 General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with KeyValue. If not, see <http://www.gnu.org/licenses/>.
 *
 **************************************************************************/

#ifndef KEYVALUE_LEXICAL_TOOL_KIT_H_
#define KEYVALUE_LEXICAL_TOOL_KIT_H_

#include <boost/utility.hpp>

#include "keyvalue/extern/String.h"
#include "keyvalue/extern/Ptime.h"
#include "keyvalue/sys/exception/Exception.h"
#include "keyvalue/util/Lexical.h"

namespace keyvalue {
namespace frontend {

class LexicalToolKit : private boost::noncopyable {

public:

  LexicalToolKit();

  enum IO { none = 0x0, input = 0x1, output = 0x2, both = 0x3};

  template <typename From, typename To>
  struct Helper {

    // The converter's signature
    typedef To (*Type_)(const From&);

    // A pointer to LexicalToolKit's member which holds the corresponding
    // conversion function pointer.
    static Type_ LexicalToolKit::* converter_;

    // A pointer to the LexicalToolKit member which holds the corresponding
    // direction flag.
    static IO    LexicalToolKit::* io_;
  };

  template <typename From, typename To>
  void
  set(IO io, typename Helper<From, To>::Type_ converter = util::Lexical);

  template <typename From, typename To>
  bool
  isEnabled(IO io) const;

  class Failure : public RuntimeError {
  };

  template <typename To, typename From>
  To
  convert(From input) const;

private:

#define KV_LEXICAL_TOOL_KIT_PAIR(From, To) \
  Helper<From, To>::Type_ From##2##To##_; \
  IO                      From##2##To##_io_;

#include "keyvalue/frontend/LexicalToolKitPairs.h"
#undef KV_LEXICAL_TOOL_KIT_PAIR

  char endInitList;

}; // class LexicalToolKit

} // namespace frontend
} // namespace keyvalue

#endif // KEYVALUE_LEXICAL_TOOL_KIT_H_