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// Template array classes
/*
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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#if !defined (octave_DiagArray2_h)
#define octave_DiagArray2_h 1
#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma interface
#endif
#include <cassert>
#include <cstdlib>
#include "Array.h"
#include "lo-error.h"
class idx_vector;
// A two-dimensional array with diagonal elements only.
//
// Idea and example code for Proxy class and functions from:
//
// From: kanze@us-es.sel.de (James Kanze)
// Subject: Re: How to overload [] to do READ/WRITE differently ?
// Message-ID: <KANZE.93Nov29151407@slsvhdt.us-es.sel.de>
// Sender: news@us-es.sel.de
// Date: 29 Nov 1993 14:14:07 GMT
// --
// James Kanze email: kanze@us-es.sel.de
// GABI Software, Sarl., 8 rue du Faisan, F-67000 Strasbourg, France
template <class T>
class
DiagArray2 : public Array<T>
{
private:
T get (int i) { return Array<T>::xelem (i); }
void set (const T& val, int i) { Array<T>::xelem (i) = val; }
class Proxy
{
public:
Proxy (DiagArray2<T> *ref, int r, int c)
: i (r), j (c), object (ref) { }
const Proxy& operator = (const T& val) const
{
if (i == j)
{
if (object)
object->set (val, i);
}
else
(*current_liboctave_error_handler)
("invalid assignment to off-diagonal in diagonal array");
return *this;
}
operator T () const
{
if (object && i == j)
return object->get (i);
else
{
static T foo;
return foo;
}
}
private:
// XXX FIXME XXX -- this is declared private to keep the user from
// taking the address of a Proxy. Maybe it should be implemented
// by means of a companion function in the DiagArray2 class.
T *operator& () const { assert (0); return (T *) 0; }
int i;
int j;
DiagArray2<T> *object;
};
friend class Proxy;
protected:
DiagArray2 (T *d, int r, int c) : Array<T> (d, r < c ? r : c)
{ Array<T>::dimensions = dim_vector (r, c); }
public:
DiagArray2 (void) : Array<T> (dim_vector (0, 0)) { }
DiagArray2 (int r, int c) : Array<T> (r < c ? r : c)
{ this->dimensions = dim_vector (r, c); }
DiagArray2 (int r, int c, const T& val) : Array<T> (r < c ? r : c)
{
this->dimensions = dim_vector (r, c);
fill (val);
}
DiagArray2 (const Array<T>& a) : Array<T> (a)
{ this->dimensions = dim_vector (a.length (), a.length ()); }
DiagArray2 (const DiagArray2<T>& a) : Array<T> (a)
{ this->dimensions = a.dims (); }
~DiagArray2 (void) { }
DiagArray2<T>& operator = (const DiagArray2<T>& a)
{
if (this != &a)
Array<T>::operator = (a);
return *this;
}
Proxy elem (int r, int c)
{
return Proxy (this, r, c);
}
Proxy checkelem (int r, int c)
{
if (r < 0 || c < 0 || r >= this->dim1 () || c >= this->dim2 ())
{
(*current_liboctave_error_handler) ("range error in DiagArray2");
return Proxy (0, r, c);
}
else
return Proxy (this, r, c);
}
Proxy operator () (int r, int c)
{
if (r < 0 || c < 0 || r >= this->dim1 () || c >= this->dim2 ())
{
(*current_liboctave_error_handler) ("range error in DiagArray2");
return Proxy (0, r, c);
}
else
return Proxy (this, r, c);
}
T elem (int r, int c) const;
T checkelem (int r, int c) const;
T operator () (int r, int c) const;
// No checking.
T& xelem (int r, int c);
T xelem (int r, int c) const;
void resize (int n, int m);
void resize (int n, int m, const T& val);
void maybe_delete_elements (idx_vector& i, idx_vector& j);
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
|
