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ov-scalar.cc
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1996-11-07
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/*
Copyright (C) 1996 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 2, 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, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if defined (__GNUG__)
#pragma implementation
#endif
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "defun.h"
#include "gripes.h"
#include "oct-obj.h"
#include "ov-scalar.h"
#include "ov-re-mat.h"
#include "ov-typeinfo.h"
#include "pr-output.h"
#include "xdiv.h"
#include "xpow.h"
octave_allocator
octave_scalar::allocator (sizeof (octave_scalar));
int
octave_scalar::t_id (-1);
const string
octave_scalar::t_name ("scalar");
static inline bool
valid_scalar_indices (const octave_value_list& args)
{
int nargin = args.length ();
for (int i = 0; i < nargin; i++)
if (! args(i).valid_as_scalar_index ())
return false;
return true;
}
octave_value
octave_scalar::index (const octave_value_list& idx) const
{
octave_value retval;
if (valid_scalar_indices (idx))
retval = scalar;
else
{
// XXX FIXME XXX -- this doesn't solve the problem of
//
// a = 1; a([1,1], [1,1], [1,1])
//
// and similar constructions. Hmm...
// XXX FIXME XXX -- using this constructor avoids narrowing the
// 1x1 matrix back to a scalar value. Need a better solution
// to this problem.
octave_value tmp (new octave_matrix (matrix_value ()));
retval = tmp.index (idx);
}
return retval;
}
octave_value
octave_scalar::convert_to_str (void) const
{
octave_value retval;
if (xisnan (scalar))
::error ("invalid conversion from NaN to character");
else
{
// XXX FIXME XXX -- warn about out of range conversions?
int i = NINT (scalar);
char s[2];
s[0] = (char) i;
s[1] = '\0';
retval = octave_value (s);
}
return retval;
}
void
octave_scalar::print (ostream& os, bool pr_as_read_syntax)
{
octave_print_internal (os, scalar, pr_as_read_syntax);
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/