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cmd_args.hpp

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/*
 * Equation Cruncher
 * Copyright (C) 2004  Dhruv Matani(dhruvbird@yahoo.com)
 * 
 * 
 * This program 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 2 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#if !defined EC_CMD_ARGS_HPP
#define EC_CMD_ARGS_HPP

#include <vector>
#include <string>
#include <istream>
#include <sstream>
#include <assert.h>

namespace eqn_cruncher
{
  // None of the member functions are intended to be thread safe /
  // reentrant.
  class arg_stream
  {
    std::vector<std::string> arg_list;
    int index;

  public:
    arg_stream(int nargs, char** args)
      : arg_list(args + 1, args + nargs)
    { }

    int
    num_args() const { return arg_list.size(); }

    void
    set_index(int i)
    {
      assert(i < (int)arg_list.size());
      this->index = i;
    }

    int
    contains(std::string const& sarg) const;

    friend
    arg_stream&
    operator>>(arg_stream& in, int& i);

    friend
    arg_stream&
    operator>>(arg_stream& in, unsigned int& i);

    friend
    arg_stream&
    operator>>(arg_stream& in, char& ch);

    friend
    arg_stream&
    operator>>(arg_stream& in, std::string& str);
  };
}


#endif // EC_CMD_ARGS_HPP

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