auto_ptr.h

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/*
 * Copyright (c) 1999
 *      GMRS Software GmbH, Innsbrucker Ring 159, 81669 Munich, Germany.
 *      http://www.gmrs.de
 *      All rights reserved.
 *      Author: Arno Unkrig ([e-mail])
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by GMRS Software GmbH.
 * 4. The name of GMRS Software GmbH may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY GMRS SOFTWARE GMBH ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GMRS SOFTWARE GMBH BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

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#ifndef __auto_ptr_h_INCLUDED__ /* { */
#define __auto_ptr_h_INCLUDED__

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#ident "$Id: auto_ptr.h,v 1.7 1999/08/13 12:36:31 arno Exp $"

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/*
 * Yet another implementation of the "auto_ptr" template... I am not sure
 * if the standard does specify "auto_ptr", and how, but this implementation
 * uses a scheme *without* an "owns" flag: When the ownership is taken away
 * from the "auto_ptr", its pointer *is set to 0*! This may seem odd, but
 * in practice, it saves you from problems because such an "auto_ptr" can
 * never be dangling, only "0", which is checked in "operator*()" and
 * "operator->()". I never found this scheme limiting.
 */

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extern "C" void abort();

template <class T>
class auto_ptr {

public:

  // Constructor/copy/destroy

  explicit auto_ptr(T *x = 0) : p(x) {}
  auto_ptr(const auto_ptr<T> &x) : p(x.p) { ((auto_ptr<T> *) &x)->p = 0; }
  void operator=(const auto_ptr<T> &x)
  { delete p; p = x.p; ((auto_ptr<T> *) &x)->p = 0; }
  // Would be a nice extension, but is not portable; use "reset()" instead:
//void operator=(T *x); { delete p; p = x; }
  ~auto_ptr() { delete p; }

  // Members

  T    &operator*() const  { if (!p) abort(); return *(T *) p; }
  T    *operator->() const { if (!p) abort(); return (T *) p; }
  T    *get() const        { return (T *) p; }
  T    *release()          { T *tmp = p; p = 0; return tmp; }
  void reset(T *x = 0)     { delete p; p = x; }

  // These would make a nice extension, but are not provided by many other
  // implementations.
//operator const void *() const { return p; }
//int operator!() const { return p == 0; }

private:
  T *p;
};

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#endif /* } */

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