[Echempp-devel] GUI/Windows/Qt/EChem++/Model num_get_special.hpp, NONE, 1.1

[beeblbrox <bee...@us...>]

Update of /cvsroot/echempp/GUI/Windows/Qt/EChem++/Model
In directory sc8-pr-cvs17.sourceforge.net:/tmp/cvs-serv14828/GUI/Windows/Qt/EChem++/Model

Added Files:
	num_get_special.hpp 
Log Message:
iostream facet needed for reading special double/float values "inf" and "nan". 
Note that this is not supported by std::iostream, so we need to add this facet
via a std::locale.


--- NEW FILE: num_get_special.hpp ---
/*! \file num_get_special.hpp
    \brief facet to use with the standard iostream library
    to read special values "inf" and "nan" which are *not*
    supported by the standard
*/

/* Copyright (C) 2007, Dominik Brugger */
/* This file is part of EChem++.

EChem++ 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.

EChem++ 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.
*/

#include <clocale>
#include <cmath> // for special values
#include <locale>
#include <iostream>

template<typename _CharT, typename _InIter>
class num_get_special : public std::num_get<_CharT,_InIter>
{
public:
  typedef typename std::num_get<_CharT, _InIter>::iter_type iter_type;
  
protected:
  virtual ~num_get_special() {}
  virtual iter_type 
  do_get(iter_type __beg, iter_type __end, std::ios_base& __io, 
	 std::ios_base::iostate& __err, float& __v) const
  {
    std::string __xstrc;
    __xstrc.reserve(32);
    __beg = _M_extract_float(__beg, __end, __io, __err, __xstrc);
    if(__xstrc == "")
      {
	// check for special inf,nan
	while(__beg != __end && !std::isalnum(*__beg)) ++__beg;
	while(__beg != __end && !std::isspace(*__beg) && std::isalnum(*__beg))__xstrc += std::tolower(*__beg++);
	if(__xstrc == "inf") __v = INFINITY;
	if(__xstrc == "nan") __v = NAN;
      }
    else
      {
	std::__convert_to_v(__xstrc.c_str(), __v, __err, std::locale::facet::_S_get_c_locale());	      }
    return __beg;
  }
  virtual iter_type
  do_get(iter_type __beg, iter_type __end, std::ios_base& __io,
	 std::ios_base::iostate& __err, double& __d) const
  {
    std::string __xstrc;
    __xstrc.reserve(32);
    __beg = _M_extract_float(__beg, __end, __io, __err, __xstrc);
    if(__xstrc == "")
      {
	// check for special inf,nan	
	while(__beg != __end && !std::isalnum(*__beg)) ++__beg;
	while(__beg != __end && !std::isspace(*__beg) && std::isalnum(*__beg))__xstrc += std::tolower(*__beg++);
	if(__xstrc == "inf") __d = INFINITY;
	if(__xstrc == "nan") __d = NAN;
      }
    else
      {
	std::__convert_to_v(__xstrc.c_str(), __d, __err, std::locale::facet::_S_get_c_locale());	
      }
    return __beg;
  }
};