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pt-exp-base.cc
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1996-11-18
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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 <string>
#include <iostream.h>
#include <strstream.h>
#include "error.h"
#include "pager.h"
#include "ov.h"
#include "pt-exp-base.h"
// Expressions.
bool
tree_expression::is_logically_true (const char *warn_for)
{
bool expr_value = false;
octave_value t1 = eval (false);
if (! error_state)
{
if (t1.is_defined ())
return t1.is_true ();
else
::error ("%s: undefined value used in conditional expression",
warn_for);
}
else
::error ("%s: error evaluating conditional expression", warn_for);
return expr_value;
}
void
tree_expression::mark_for_possible_ans_assign (void)
{
panic_impossible ();
}
octave_value
tree_expression::eval (bool /* print */)
{
panic ("invalid evaluation of generic expression");
return octave_value ();
}
string
tree_expression::original_text (void) const
{
return string ();
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/