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// -*-c++-*-
/* $Id: stllike.h,v 1.7 2001/05/17 03:42:35 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _STL_LIKE_H_
#define _STL_LIKE_H_
#ifndef USE_STL
/* misc stuff */
#undef min
template <class T>
inline const T &min (const T &a, const T &b)
{
return b < a ? b : a;
}
#undef max
template <class T>
inline const T &max (const T &a, const T &b)
{
return a < b ? b : a;
}
#else /* USE_STL */
#include <algorithm>
#endif /* USE_STL */
template<class R> inline R
implicit_cast (R r)
{
return r;
}
/*
* The remaining code is additionally covered by this copyright:
*
* Copyright (c) 1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
template <class T> class auto_ptr {
private:
T* M_ptr;
public:
typedef T element_type;
explicit auto_ptr (T *p = 0) : M_ptr (p) {}
auto_ptr (auto_ptr &a) : M_ptr (a.release ()) {}
template <class U> auto_ptr (auto_ptr <U> &a) : M_ptr (a.release ()) {}
auto_ptr &operator= (auto_ptr& a) {
if (&a != this) {
delete M_ptr;
M_ptr = a.release();
}
return *this;
}
template <class U> auto_ptr &operator= (auto_ptr<U> &a) {
if (a.get() != this->get()) {
delete M_ptr;
M_ptr = a.release();
}
return *this;
}
~auto_ptr () { delete M_ptr; }
T &operator* () const
{ return *M_ptr; }
T *operator-> () const
{ return M_ptr; }
T *get () const
{ return M_ptr; }
T *release () {
T *tmp = M_ptr;
M_ptr = 0;
return tmp;
}
void reset (T *p = 0) {
delete M_ptr;
M_ptr = p;
}
#if 0
// I don't understand the following
// According to the C++ standard, these conversions are required. Most
// present-day compilers, however, do not enforce that requirement---and,
// in fact, most present-day compilers do not support the language
// features that these conversions rely on.
private:
template<class U> struct auto_ptr_ref {
U *M_ptr;
auto_ptr_ref (U *p) : M_ptr (p) {}
};
public:
auto_ptr (auto_ptr_ref<T> ref) : M_ptr (ref.M_ptr) {}
template <class U> operator auto_ptr_ref<U> ()
{ return auto_ptr_ref<T> (this.release ()); }
template <class U> operator auto_ptr<U> ()
{ return auto_ptr<U> (this->release ()) }
#endif /* 0 */
};
#endif /* !_STL_LIKE_H_ */
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