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Edit File : auto_ptr.h \| Size : 10.55 KB
// auto_ptr implementation -- C++ -- // Copyright (C) 2007-2018 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 3, 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. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file backward/auto_ptr.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{memory} / #ifndef _BACKWARD_AUTO_PTR_H #define _BACKWARD_AUTO_PTR_H 1 #include <bits/c++config.h> #include <debug/debug.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /* * A wrapper class to provide auto_ptr with reference semantics. * For example, an auto_ptr can be assigned (or constructed from) * the result of a function which returns an auto_ptr by value. * * All the auto_ptr_ref stuff should happen behind the scenes. / template<typename _Tp1> struct auto_ptr_ref { _Tp1 _M_ptr; explicit auto_ptr_ref(_Tp1* __p): _M_ptr(__p) { } } _GLIBCXX_DEPRECATED; #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" /** * @brief A simple smart pointer providing strict ownership semantics. * * The Standard says: * <pre> * An @c auto_ptr owns the object it holds a pointer to. Copying * an @c auto_ptr copies the pointer and transfers ownership to the * destination. If more than one @c auto_ptr owns the same object * at the same time the behavior of the program is undefined. * * The uses of @c auto_ptr include providing temporary * exception-safety for dynamically allocated memory, passing * ownership of dynamically allocated memory to a function, and * returning dynamically allocated memory from a function. @c * auto_ptr does not meet the CopyConstructible and Assignable * requirements for Standard Library <a * href="tables.html#65">container</a> elements and thus * instantiating a Standard Library container with an @c auto_ptr * results in undefined behavior. * </pre> * Quoted from [20.4.5]/3. * * Good examples of what can and cannot be done with auto_ptr can * be found in the libstdc++ testsuite. * * _GLIBCXX_RESOLVE_LIB_DEFECTS * 127. auto_ptr<> conversion issues * These resolutions have all been incorporated. / template<typename _Tp> class auto_ptr { private: _Tp _M_ptr; public: /// The pointed-to type. typedef _Tp element_type; /** * @brief An %auto_ptr is usually constructed from a raw pointer. * @param __p A pointer (defaults to NULL). * * This object now @e owns the object pointed to by @a __p. / explicit auto_ptr(element_type __p = 0) throw() : _M_ptr(__p) { } /** * @brief An %auto_ptr can be constructed from another %auto_ptr. * @param __a Another %auto_ptr of the same type. * * This object now @e owns the object previously owned by @a __a, * which has given up ownership. / auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) { } /* * @brief An %auto_ptr can be constructed from another %auto_ptr. * @param __a Another %auto_ptr of a different but related type. * * A pointer-to-Tp1 must be convertible to a * pointer-to-Tp/element_type. * * This object now @e owns the object previously owned by @a __a, * which has given up ownership. / template<typename _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw() : _M_ptr(__a.release()) { } /* * @brief %auto_ptr assignment operator. * @param __a Another %auto_ptr of the same type. * * This object now @e owns the object previously owned by @a __a, * which has given up ownership. The object that this one @e * used to own and track has been deleted. / auto_ptr& operator=(auto_ptr& __a) throw() { reset(__a.release()); return this; } /** * @brief %auto_ptr assignment operator. * @param __a Another %auto_ptr of a different but related type. * * A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type. * * This object now @e owns the object previously owned by @a __a, * which has given up ownership. The object that this one @e * used to own and track has been deleted. / template<typename _Tp1> auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() { reset(__a.release()); return this; } /** * When the %auto_ptr goes out of scope, the object it owns is * deleted. If it no longer owns anything (i.e., @c get() is * @c NULL), then this has no effect. * * 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 this is * prohibited. [17.4.3.6]/2 / ~auto_ptr() { delete _M_ptr; } /* * @brief Smart pointer dereferencing. * * If this %auto_ptr no longer owns anything, then this * operation will crash. (For a smart pointer, <em>no longer owns * anything</em> is the same as being a null pointer, and you know * what happens when you dereference one of those...) / element_type& operator() const throw() { __glibcxx_assert(_M_ptr != 0); return _M_ptr; } /* * @brief Smart pointer dereferencing. * * This returns the pointer itself, which the language then will * automatically cause to be dereferenced. / element_type operator->() const throw() { __glibcxx_assert(_M_ptr != 0); return _M_ptr; } /** * @brief Bypassing the smart pointer. * @return The raw pointer being managed. * * You can get a copy of the pointer that this object owns, for * situations such as passing to a function which only accepts * a raw pointer. * * @note This %auto_ptr still owns the memory. / element_type get() const throw() { return _M_ptr; } /** * @brief Bypassing the smart pointer. * @return The raw pointer being managed. * * You can get a copy of the pointer that this object owns, for * situations such as passing to a function which only accepts * a raw pointer. * * @note This %auto_ptr no longer owns the memory. When this object * goes out of scope, nothing will happen. / element_type release() throw() { element_type* __tmp = _M_ptr; _M_ptr = 0; return __tmp; } /** * @brief Forcibly deletes the managed object. * @param __p A pointer (defaults to NULL). * * This object now @e owns the object pointed to by @a __p. The * previous object has been deleted. / void reset(element_type __p = 0) throw() { if (__p != _M_ptr) { delete _M_ptr; _M_ptr = __p; } } /** * @brief Automatic conversions * * These operations are supposed to convert an %auto_ptr into and from * an auto_ptr_ref automatically as needed. This would allow * constructs such as * @code * auto_ptr<Derived> func_returning_auto_ptr(.....); * ... * auto_ptr<Base> ptr = func_returning_auto_ptr(.....); * @endcode * * But it doesn't work, and won't be fixed. For further details see * http://cplusplus.github.io/LWG/lwg-closed.html#463 / auto_ptr(auto_ptr_ref<element_type> __ref) throw() : _M_ptr(__ref._M_ptr) { } auto_ptr& operator=(auto_ptr_ref<element_type> __ref) throw() { if (__ref._M_ptr != this->get()) { delete _M_ptr; _M_ptr = __ref._M_ptr; } return this; } template<typename _Tp1> operator auto_ptr_ref<_Tp1>() throw() { return auto_ptr_ref<_Tp1>(this->release()); } template<typename _Tp1> operator auto_ptr<_Tp1>() throw() { return auto_ptr<_Tp1>(this->release()); } } _GLIBCXX_DEPRECATED; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 541. shared_ptr template assignment and void template<> class auto_ptr<void> { public: typedef void element_type; } _GLIBCXX_DEPRECATED; #if __cplusplus >= 201103L template<_Lock_policy _Lp> template<typename _Tp> inline __shared_count<_Lp>::__shared_count(std::auto_ptr<_Tp>&& __r) : _M_pi(new _Sp_counted_ptr<_Tp, _Lp>(__r.get())) { __r.release(); } template<typename _Tp, _Lock_policy _Lp> template<typename _Tp1, typename> inline __shared_ptr<_Tp, _Lp>::__shared_ptr(std::auto_ptr<_Tp1>&& __r) : _M_ptr(__r.get()), _M_refcount() { __glibcxx_function_requires(_ConvertibleConcept<_Tp1, _Tp>) static_assert( sizeof(_Tp1) > 0, "incomplete type" ); _Tp1 __tmp = __r.get(); _M_refcount = __shared_count<_Lp>(std::move(__r)); _M_enable_shared_from_this_with(__tmp); } template<typename _Tp> template<typename _Tp1, typename> inline shared_ptr<_Tp>::shared_ptr(std::auto_ptr<_Tp1>&& __r) : __shared_ptr<_Tp>(std::move(__r)) { } template<typename _Tp, typename _Dp> template<typename _Up, typename> inline unique_ptr<_Tp, _Dp>::unique_ptr(auto_ptr<_Up>&& __u) noexcept : _M_t(__u.release(), deleter_type()) { } #endif #pragma GCC diagnostic pop _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _BACKWARD_AUTO_PTR_H */ Back

Edit File : auto_ptr.h | Size : 10.55 KB

// auto_ptr implementation -*- C++ -*-

// Copyright (C) 2007-2018 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file backward/auto_ptr.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{memory}
 */

#ifndef _BACKWARD_AUTO_PTR_H
#define _BACKWARD_AUTO_PTR_H 1

#include <bits/c++config.h>
#include <debug/debug.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
   *  A wrapper class to provide auto_ptr with reference semantics.
   *  For example, an auto_ptr can be assigned (or constructed from)
   *  the result of a function which returns an auto_ptr by value.
   *
   *  All the auto_ptr_ref stuff should happen behind the scenes.
   */
  template<typename _Tp1>
    struct auto_ptr_ref
    {
      _Tp1* _M_ptr;
      
      explicit
      auto_ptr_ref(_Tp1* __p): _M_ptr(__p) { }
    } _GLIBCXX_DEPRECATED;

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

/**
   *  @brief  A simple smart pointer providing strict ownership semantics.
   *
   *  The Standard says:
   *  <pre>
   *  An @c auto_ptr owns the object it holds a pointer to.  Copying
   *  an @c auto_ptr copies the pointer and transfers ownership to the
   *  destination.  If more than one @c auto_ptr owns the same object
   *  at the same time the behavior of the program is undefined.
   *
   *  The uses of @c auto_ptr include providing temporary
   *  exception-safety for dynamically allocated memory, passing
   *  ownership of dynamically allocated memory to a function, and
   *  returning dynamically allocated memory from a function.  @c
   *  auto_ptr does not meet the CopyConstructible and Assignable
   *  requirements for Standard Library <a
   *  href="tables.html#65">container</a> elements and thus
   *  instantiating a Standard Library container with an @c auto_ptr
   *  results in undefined behavior.
   *  </pre>
   *  Quoted from [20.4.5]/3.
   *
   *  Good examples of what can and cannot be done with auto_ptr can
   *  be found in the libstdc++ testsuite.
   *
   *  _GLIBCXX_RESOLVE_LIB_DEFECTS
   *  127.  auto_ptr<> conversion issues
   *  These resolutions have all been incorporated.
   */
  template<typename _Tp>
    class auto_ptr
    {
    private:
      _Tp* _M_ptr;
      
    public:
      /// The pointed-to type.
      typedef _Tp element_type;
      
      /**
       *  @brief  An %auto_ptr is usually constructed from a raw pointer.
       *  @param  __p  A pointer (defaults to NULL).
       *
       *  This object now @e owns the object pointed to by @a __p.
       */
      explicit
      auto_ptr(element_type* __p = 0) throw() : _M_ptr(__p) { }

/**
       *  @brief  An %auto_ptr can be constructed from another %auto_ptr.
       *  @param  __a  Another %auto_ptr of the same type.
       *
       *  This object now @e owns the object previously owned by @a __a,
       *  which has given up ownership.
       */
      auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) { }

/**
       *  @brief  An %auto_ptr can be constructed from another %auto_ptr.
       *  @param  __a  Another %auto_ptr of a different but related type.
       *
       *  A pointer-to-Tp1 must be convertible to a
       *  pointer-to-Tp/element_type.
       *
       *  This object now @e owns the object previously owned by @a __a,
       *  which has given up ownership.
       */
      template<typename _Tp1>
        auto_ptr(auto_ptr<_Tp1>& __a) throw() : _M_ptr(__a.release()) { }

/**
       *  @brief  %auto_ptr assignment operator.
       *  @param  __a  Another %auto_ptr of the same type.
       *
       *  This object now @e owns the object previously owned by @a __a,
       *  which has given up ownership.  The object that this one @e
       *  used to own and track has been deleted.
       */
      auto_ptr&
      operator=(auto_ptr& __a) throw()
      {
	reset(__a.release());
	return *this;
      }

/**
       *  @brief  %auto_ptr assignment operator.
       *  @param  __a  Another %auto_ptr of a different but related type.
       *
       *  A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type.
       *
       *  This object now @e owns the object previously owned by @a __a,
       *  which has given up ownership.  The object that this one @e
       *  used to own and track has been deleted.
       */
      template<typename _Tp1>
        auto_ptr&
        operator=(auto_ptr<_Tp1>& __a) throw()
        {
	  reset(__a.release());
	  return *this;
	}

/**
       *  When the %auto_ptr goes out of scope, the object it owns is
       *  deleted.  If it no longer owns anything (i.e., @c get() is
       *  @c NULL), then this has no effect.
       *
       *  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 this is
       *  prohibited.  [17.4.3.6]/2
       */
      ~auto_ptr() { delete _M_ptr; }
      
      /**
       *  @brief  Smart pointer dereferencing.
       *
       *  If this %auto_ptr no longer owns anything, then this
       *  operation will crash.  (For a smart pointer, <em>no longer owns
       *  anything</em> is the same as being a null pointer, and you know
       *  what happens when you dereference one of those...)
       */
      element_type&
      operator*() const throw() 
      {
	__glibcxx_assert(_M_ptr != 0);
	return *_M_ptr; 
      }
      
      /**
       *  @brief  Smart pointer dereferencing.
       *
       *  This returns the pointer itself, which the language then will
       *  automatically cause to be dereferenced.
       */
      element_type*
      operator->() const throw() 
      {
	__glibcxx_assert(_M_ptr != 0);
	return _M_ptr; 
      }
      
      /**
       *  @brief  Bypassing the smart pointer.
       *  @return  The raw pointer being managed.
       *
       *  You can get a copy of the pointer that this object owns, for
       *  situations such as passing to a function which only accepts
       *  a raw pointer.
       *
       *  @note  This %auto_ptr still owns the memory.
       */
      element_type*
      get() const throw() { return _M_ptr; }
      
      /**
       *  @brief  Bypassing the smart pointer.
       *  @return  The raw pointer being managed.
       *
       *  You can get a copy of the pointer that this object owns, for
       *  situations such as passing to a function which only accepts
       *  a raw pointer.
       *
       *  @note  This %auto_ptr no longer owns the memory.  When this object
       *  goes out of scope, nothing will happen.
       */
      element_type*
      release() throw()
      {
	element_type* __tmp = _M_ptr;
	_M_ptr = 0;
	return __tmp;
      }
      
      /**
       *  @brief  Forcibly deletes the managed object.
       *  @param  __p  A pointer (defaults to NULL).
       *
       *  This object now @e owns the object pointed to by @a __p.  The
       *  previous object has been deleted.
       */
      void
      reset(element_type* __p = 0) throw()
      {
	if (__p != _M_ptr)
	  {
	    delete _M_ptr;
	    _M_ptr = __p;
	  }
      }
      
      /** 
       *  @brief  Automatic conversions
       *
       *  These operations are supposed to convert an %auto_ptr into and from
       *  an auto_ptr_ref automatically as needed.  This would allow
       *  constructs such as
       *  @code
       *    auto_ptr<Derived>  func_returning_auto_ptr(.....);
       *    ...
       *    auto_ptr<Base> ptr = func_returning_auto_ptr(.....);
       *  @endcode
       *
       *  But it doesn't work, and won't be fixed. For further details see
       *  http://cplusplus.github.io/LWG/lwg-closed.html#463
       */
      auto_ptr(auto_ptr_ref<element_type> __ref) throw()
      : _M_ptr(__ref._M_ptr) { }
      
      auto_ptr&
      operator=(auto_ptr_ref<element_type> __ref) throw()
      {
	if (__ref._M_ptr != this->get())
	  {
	    delete _M_ptr;
	    _M_ptr = __ref._M_ptr;
	  }
	return *this;
      }
      
      template<typename _Tp1>
        operator auto_ptr_ref<_Tp1>() throw()
        { return auto_ptr_ref<_Tp1>(this->release()); }

template<typename _Tp1>
        operator auto_ptr<_Tp1>() throw()
        { return auto_ptr<_Tp1>(this->release()); }
    } _GLIBCXX_DEPRECATED;

// _GLIBCXX_RESOLVE_LIB_DEFECTS
  // 541. shared_ptr template assignment and void
  template<>
    class auto_ptr<void>
    {
    public:
      typedef void element_type;
    } _GLIBCXX_DEPRECATED;

#if __cplusplus >= 201103L
  template<_Lock_policy _Lp>
  template<typename _Tp>
    inline
    __shared_count<_Lp>::__shared_count(std::auto_ptr<_Tp>&& __r)
    : _M_pi(new _Sp_counted_ptr<_Tp*, _Lp>(__r.get()))
    { __r.release(); }

template<typename _Tp, _Lock_policy _Lp>
  template<typename _Tp1, typename>
    inline
    __shared_ptr<_Tp, _Lp>::__shared_ptr(std::auto_ptr<_Tp1>&& __r)
    : _M_ptr(__r.get()), _M_refcount()
    {
      __glibcxx_function_requires(_ConvertibleConcept<_Tp1*, _Tp*>)
      static_assert( sizeof(_Tp1) > 0, "incomplete type" );
      _Tp1* __tmp = __r.get();
      _M_refcount = __shared_count<_Lp>(std::move(__r));
      _M_enable_shared_from_this_with(__tmp);
    }

template<typename _Tp>
  template<typename _Tp1, typename>
    inline
    shared_ptr<_Tp>::shared_ptr(std::auto_ptr<_Tp1>&& __r)
    : __shared_ptr<_Tp>(std::move(__r)) { }

template<typename _Tp, typename _Dp>
  template<typename _Up, typename>
    inline
    unique_ptr<_Tp, _Dp>::unique_ptr(auto_ptr<_Up>&& __u) noexcept
    : _M_t(__u.release(), deleter_type()) { }
#endif

#pragma GCC diagnostic pop

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _BACKWARD_AUTO_PTR_H */

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