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// <memory> -*- C++ -*-
// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 library 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 library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
* Copyright (c) 1997-1999
* 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.
*
*/
/** @file memory
* This is a Standard C++ Library header. You should @c #include this header
* in your programs, rather than any of the "st[dl]_*.h" implementation files.
*/
#ifndef _CPP_MEMORY
#define _CPP_MEMORY 1
#pragma GCC system_header
#include <bits/stl_algobase.h>
#include <bits/stl_alloc.h>
#include <bits/stl_construct.h>
#include <bits/stl_iterator_base_types.h> //for iterator_traits
#include <bits/stl_uninitialized.h>
#include <bits/stl_raw_storage_iter.h>
namespace std
{
/**
* @if maint
* This is a helper function. The unused second parameter exists to
* permit the real get_temporary_buffer to use template parameter deduction.
* @endif
*/
template <class _Tp>
pair<_Tp*, ptrdiff_t>
__get_temporary_buffer(ptrdiff_t __len, _Tp*)
{
if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
__len = INT_MAX / sizeof(_Tp);
while (__len > 0) {
_Tp* __tmp = (_Tp*) std::malloc((std::size_t)__len * sizeof(_Tp));
if (__tmp != 0)
return pair<_Tp*, ptrdiff_t>(__tmp, __len);
__len /= 2;
}
return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
}
/**
* @brief This is a mostly-useless wrapper around malloc().
* @param len The number of objects of type Tp.
* @return See full description.
*
* Reinventing the wheel, but this time with prettier spokes!
*
* This function tries to obtain storage for @c len adjacent Tp objects.
* The objects themselves are not constructed, of course. A pair<> is
* returned containing "the buffer s address and capacity (in the units of
* sizeof(Tp)), or a pair of 0 values if no storage can be obtained."
* Note that the capacity obtained may be less than that requested if the
* memory is unavailable; you should compare len with the .second return
* value.
*/
template <class _Tp>
inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
return __get_temporary_buffer(__len, (_Tp*) 0);
}
/**
* @brief The companion to get_temporary_buffer().
* @param p A buffer previously allocated by get_temporary_buffer.
* @return None.
*
* Frees the memory pointed to by p.
*/
template <class _Tp>
void return_temporary_buffer(_Tp* __p) {
std::free(__p);
}
template <class _Tp1>
struct auto_ptr_ref
{
_Tp1* _M_ptr;
auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {}
};
/**
* A simple smart pointer providing strict ownership semantics. (More later.)
*/
template <class _Tp>
class auto_ptr
{
private:
_Tp* _M_ptr;
public:
typedef _Tp element_type;
explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {}
auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {}
template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw()
: _M_ptr(__a.release()) {}
auto_ptr& operator=(auto_ptr& __a) throw() {
reset(__a.release());
return *this;
}
template <class _Tp1>
auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() {
reset(__a.release());
return *this;
}
// Note: The C++ standard says there is supposed to be an empty throw
// specification here, but omitting it is standard conforming. Its
// presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2)
// this is prohibited.
~auto_ptr() { delete _M_ptr; }
_Tp& operator*() const throw() {
return *_M_ptr;
}
_Tp* operator->() const throw() {
return _M_ptr;
}
_Tp* get() const throw() {
return _M_ptr;
}
_Tp* release() throw() {
_Tp* __tmp = _M_ptr;
_M_ptr = 0;
return __tmp;
}
void reset(_Tp* __p = 0) throw() {
if (__p != _M_ptr) {
delete _M_ptr;
_M_ptr = __p;
}
}
public:
auto_ptr(auto_ptr_ref<_Tp> __ref) throw()
: _M_ptr(__ref._M_ptr) {}
auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() {
if (__ref._M_ptr != this->get()) {
delete _M_ptr;
_M_ptr = __ref._M_ptr;
}
return *this;
}
template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw()
{ return auto_ptr_ref<_Tp>(this->release()); }
template <class _Tp1> operator auto_ptr<_Tp1>() throw()
{ return auto_ptr<_Tp1>(this->release()); }
};
} // namespace std
#endif /* _CPP_MEMORY */
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