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+++ b/liboctave/MDiagArray2.h
@@ -0,0 +1,120 @@
+// Template array classes with like-type math ops          -*- C++ -*-
+/*
+
+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 interface
+#endif
+
+#if !defined (octave_MDiagArray2_h)
+#define octave_MDiagArray2_h 1
+
+#include "DiagArray2.h"
+#include "MArray2.h"
+
+// Two dimensional diagonal array with math ops.
+
+template <class T>
+class MDiagArray2 : public DiagArray2<T>
+{
+protected:
+
+  MDiagArray2 (T *d, int r, int c) : DiagArray2<T> (d, r, c) { }
+
+public:
+  
+  MDiagArray2 (void) : DiagArray2<T> () { }
+  MDiagArray2 (int r, int c) : DiagArray2<T> (r, c) { }
+  MDiagArray2 (int r, int c, const T& val) : DiagArray2<T> (r, c, val) { }
+  MDiagArray2 (const Array<T>& a) : DiagArray2<T> (a) { }
+  MDiagArray2 (const MArray<T>& a) : DiagArray2<T> (a) { }
+  MDiagArray2 (const DiagArray2<T>& a) : DiagArray2<T> (a) { }
+  MDiagArray2 (const MDiagArray2<T>& a) : DiagArray2<T> (a) { }
+
+  ~MDiagArray2 (void) { }
+
+  MDiagArray2<T>& operator = (const MDiagArray2<T>& a)
+    {
+      DiagArray2<T>::operator = (a);
+      return *this;
+    }
+
+  operator MArray2<T> () const
+    {
+      MArray2<T> retval (nr, nc,  T (0));
+
+      int len = nr < nc ? nr : nc;
+
+      for (int i = 0; i < len; i++)
+	retval.xelem (i, i) = xelem (i, i);
+
+      return retval;
+    }
+
+  // element by element MDiagArray2 by MDiagArray2 ops
+
+  friend MDiagArray2<T>&
+  operator += (MDiagArray2<T>& a, const MDiagArray2<T>& b);
+
+  friend MDiagArray2<T>&
+  operator -= (MDiagArray2<T>& a, const MDiagArray2<T>& b);
+
+  // element by element MDiagArray2 by scalar ops
+
+  friend MDiagArray2<T> operator * (const MDiagArray2<T>& a, const T& s);
+  friend MDiagArray2<T> operator / (const MDiagArray2<T>& a, const T& s);
+
+  // element by element scalar by MDiagArray2 ops
+
+  friend MDiagArray2<T> operator * (const T& s, const MDiagArray2<T>& a);
+
+  // element by element MDiagArray2 by MDiagArray2 ops
+
+  friend MDiagArray2<T>
+  operator + (const MDiagArray2<T>& a, const MDiagArray2<T>& b); 
+
+  friend MDiagArray2<T>
+  operator - (const MDiagArray2<T>& a, const MDiagArray2<T>& b);
+
+  friend MDiagArray2<T>
+  product (const MDiagArray2<T>& a, const MDiagArray2<T>& b);
+
+  friend MDiagArray2<T> operator - (const MDiagArray2<T>& a);
+};
+
+#define INSTANTIATE_MDIAGARRAY_FRIENDS(T) \
+  template MDiagArray2<T> operator * (const MDiagArray2<T>& a, const T& s); \
+  template MDiagArray2<T> operator / (const MDiagArray2<T>& a, const T& s); \
+  template MDiagArray2<T> operator * (const T& s, const MDiagArray2<T>& a); \
+  template MDiagArray2<T> operator + (const MDiagArray2<T>& a, const MDiagArray2<T>& b); \
+  template MDiagArray2<T> operator - (const MDiagArray2<T>& a, const MDiagArray2<T>& b); \
+  template MDiagArray2<T> product (const MDiagArray2<T>& a, const MDiagArray2<T>& b); \
+  template MDiagArray2<T> operator - (const MDiagArray2<T>& a);
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/