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ov-type-conv.h

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/*

Copyright (C) 2004, 2005, 2006, 2007, 2008 John W. Eaton

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_ov_type_conv_h)
#define octave_ov_type_conv_h 1

static 
octave_value
octave_type_conv_body (const octave_value &arg, const std::string& name, int t_result)
{
  int t_arg = arg.type_id ();
  octave_value retval;

  if (t_arg == t_result || arg.class_name () == name)
    {
      retval = arg;
    }
  else
    {
      octave_base_value::type_conv_fcn cf1
        = octave_value_typeinfo::lookup_type_conv_op (t_arg, t_result);
       
      if (cf1)
        {
          octave_base_value *tmp (cf1 (*(arg.internal_rep ())));

          if (tmp)
            {
              retval = octave_value (tmp);

              retval.maybe_mutate ();
            }
        }
      else
        {
          octave_base_value::type_conv_fcn cf2
            = arg.numeric_conversion_function ();

          if (cf2)
            {
              octave_base_value *tmp (cf2 (*(arg.internal_rep ())));

              if (tmp)
                {
                  octave_value xarg (tmp);

                  retval = octave_type_conv_body (xarg, name, t_result);
                }
            }
        }
    }

  return retval;
}
                         

#define OCTAVE_TYPE_CONV_BODY3(NAME, MATRIX_RESULT_T, SCALAR_RESULT_T) \
 \
  octave_value retval; \
 \
  int nargin = args.length (); \
 \
  if (nargin == 1) \
    { \
      const octave_value arg = args(0); \
 \
      int t_result = MATRIX_RESULT_T::static_type_id (); \
 \
      retval = octave_type_conv_body (arg, #NAME, t_result); \
      if (retval.is_undefined ()) \
        { \
          std::string arg_tname = arg.type_name (); \
 \
          std::string result_tname = arg.numel () == 1 \
            ? SCALAR_RESULT_T::static_type_name () \
            : MATRIX_RESULT_T::static_type_name (); \
 \
          gripe_invalid_conversion (arg_tname, result_tname); \
        } \
    } \
  else \
    print_usage (); \
 \
  return retval

#define OCTAVE_TYPE_CONV_BODY(NAME) \
  OCTAVE_TYPE_CONV_BODY3 (NAME, octave_ ## NAME ## _matrix, \
                          octave_ ## NAME ## _scalar)

#endif

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/