# HG changeset patch
# User jwe
# Date 863189387 0
# Node ID c4bc40161199fd7a8ee14e162653c4346c184a38
# Parent  ab9673e3bb5d178161710bd045d4a3556576934e
[project @ 1997-05-09 14:49:47 by jwe]

diff -r ab9673e3bb5d -r c4bc40161199 src/oct-var-ref.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/oct-var-ref.cc	Fri May 09 14:49:47 1997 +0000
@@ -0,0 +1,63 @@
+/*
+
+Copyright (C) 1996, 1997 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.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "oct-obj.h"
+#include "oct-var-ref.h"
+#include "ov.h"
+
+void
+octave_variable_reference::assign (octave_value::assign_op op,
+				   const octave_value& rhs)
+{
+  octave_value saved_val;
+
+  if (chg_fcn)
+    octave_value saved_val = *val;
+
+  if (idx.empty ())
+    {
+      if (struct_elt_name.empty ())
+	val->assign (op, rhs);
+      else
+	val->assign_struct_elt (op, struct_elt_name, rhs);
+    }
+  else
+    {
+      if (struct_elt_name.empty ())
+	val->assign (op, idx, rhs);
+      else
+	val->assign_struct_elt (op, struct_elt_name, idx, rhs);
+    }
+
+  if (chg_fcn && chg_fcn () < 0)
+    *val = saved_val;
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/
diff -r ab9673e3bb5d -r c4bc40161199 src/oct-var-ref.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/oct-var-ref.h	Fri May 09 14:49:47 1997 +0000
@@ -0,0 +1,104 @@
+/*
+
+Copyright (C) 1996, 1997 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 (octave_variable_reference_h)
+#define octave_variable_reference_h 1
+
+class octave_value;
+class octave_value_list;
+
+#include <string>
+
+#include "oct-obj.h"
+#include "symtab.h"
+
+class
+octave_variable_reference
+{
+public:
+
+  octave_variable_reference (octave_value *v = 0,
+			     symbol_record::sv_function f = 0)
+    : val (v), idx (), chg_fcn (f), struct_elt_name () { }
+
+  octave_variable_reference (octave_value *v, const string& nm,
+			     symbol_record::sv_function f = 0)
+    : val (v), idx (), chg_fcn (f), struct_elt_name (nm) { }
+
+  octave_variable_reference (const octave_variable_reference& vr)
+    : val (vr.val), idx (vr.idx), chg_fcn (vr.chg_fcn),
+      struct_elt_name (vr.struct_elt_name) { }
+
+  octave_variable_reference& operator = (const octave_variable_reference& vr)
+    {
+      if (this != &vr)
+	{
+	  val = vr.val;
+	  idx = vr.idx;
+	  chg_fcn = vr.chg_fcn;
+	  struct_elt_name = vr.struct_elt_name;
+	}
+
+      return *this;
+    }
+
+  ~octave_variable_reference (void) { }
+
+  bool is_undefined (void) { return val->is_undefined (); }
+
+  void define (const octave_value& v) { *val = v; }
+
+  void assign (octave_value::assign_op, const octave_value&);
+
+  octave_variable_reference struct_elt_ref (const string& nm)
+    { return val->struct_elt_ref (nm); }
+
+  void index (const octave_value_list& i) { idx = i; }
+
+  void increment (void) { val->increment (); }
+
+  void decrement (void) { val->decrement (); }
+
+  octave_value value (void)
+    {
+      return struct_elt_name.empty ()
+	? *val : val->struct_elt_val (struct_elt_name);
+    }
+
+private:
+
+  octave_value *val;
+
+  octave_value_list idx;
+
+  symbol_record::sv_function chg_fcn;
+
+  string struct_elt_name;
+};
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/