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// unique_ptr implementation -*- C++ -*-

// Copyright (C) 2008, 2009, 2010 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 unique_ptr.h

 *  This is an internal header file, included by other library headers.

 *  You should not attempt to use it directly.

 */

#ifndef _UNIQUE_PTR_H

#define _UNIQUE_PTR_H 1

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

#include <debug/debug.h>

#include <type_traits>

#include <utility>

#include <tuple>

_GLIBCXX_BEGIN_NAMESPACE(std)

  /**

   * @addtogroup pointer_abstractions

   * @{

   */

  /// Primary template, default_delete.

  template<typename _Tp>

    struct default_delete

      {

        default_delete() { }

        template<typename _Up>

          default_delete(const default_delete<_Up>&) { }

        void

        operator()(_Tp* __ptr) const

        {

          static_assert(sizeof(_Tp)>0,

                        "can't delete pointer to incomplete type");

          delete __ptr;

        }

    };

  // _GLIBCXX_RESOLVE_LIB_DEFECTS

  // DR 740 - omit specialization for array objects with a compile time length

  /// Specialization, default_delete.

  template<typename _Tp>

    struct default_delete<_Tp[]>

    {

      void

      operator()(_Tp* __ptr) const

      {

        static_assert(sizeof(_Tp)>0,

                      "can't delete pointer to incomplete type");

        delete [] __ptr;

      }

    };

  /// 20.7.12.2 unique_ptr for single objects.

  template <typename _Tp, typename _Tp_Deleter = default_delete<_Tp> >

    class unique_ptr

    {

      typedef std::tuple<_Tp*, _Tp_Deleter>  __tuple_type;

      typedef _Tp* unique_ptr::*             __unspecified_pointer_type;

    public:

      typedef _Tp*               pointer;

      typedef _Tp                element_type;

      typedef _Tp_Deleter        deleter_type;

      // Constructors.

      unique_ptr()

      : _M_t(pointer(), deleter_type())

      { static_assert(!std::is_pointer<deleter_type>::value,

                      "constructed with null function pointer deleter"); }

      explicit

      unique_ptr(pointer __p)

      : _M_t(__p, deleter_type())

      { static_assert(!std::is_pointer<deleter_type>::value,

                     "constructed with null function pointer deleter"); }

      unique_ptr(pointer __p,

          typename std::conditional<std::is_reference<deleter_type>::value,

            deleter_type, const deleter_type&>::type __d)

      : _M_t(__p, __d) { }

      unique_ptr(pointer __p,

          typename std::remove_reference<deleter_type>::type&& __d)

      : _M_t(std::move(__p), std::move(__d))

      { static_assert(!std::is_reference<deleter_type>::value,

                      "rvalue deleter bound to reference"); }

      // Move constructors.

      unique_ptr(unique_ptr&& __u)

      : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

      template<typename _Up, typename _Up_Deleter>

        unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)

        : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))

        { }

      // Destructor.

      ~unique_ptr() { reset(); }

      // Assignment.

      unique_ptr&

      operator=(unique_ptr&& __u)

      {

        reset(__u.release());

        get_deleter() = std::move(__u.get_deleter());

        return *this;

      }

      template<typename _Up, typename _Up_Deleter>

        unique_ptr&

        operator=(unique_ptr<_Up, _Up_Deleter>&& __u)

        {

          reset(__u.release());

          get_deleter() = std::move(__u.get_deleter());

          return *this;

        }

      unique_ptr&

      operator=(__unspecified_pointer_type)

      {

        reset();

        return *this;

      }

      // Observers.

      typename std::add_lvalue_reference<element_type>::type

      operator*() const

      {

        _GLIBCXX_DEBUG_ASSERT(get() != pointer());

        return *get();

      }

      pointer

      operator->() const

      {

        _GLIBCXX_DEBUG_ASSERT(get() != pointer());

        return get();

      }

      pointer

      get() const

      { return std::get<0>(_M_t); }

      deleter_type&

      get_deleter()

      { return std::get<1>(_M_t); }

      const deleter_type&

      get_deleter() const

      { return std::get<1>(_M_t); }

      explicit operator bool() const

      { return get() == pointer() ? false : true; }

      // Modifiers.

      pointer

      release()

      {

        pointer __p = get();

        std::get<0>(_M_t) = pointer();

        return __p;

      }

      void

      reset(pointer __p = pointer())

      {

        using std::swap;

        swap(std::get<0>(_M_t), __p);

        if (__p != pointer())

          get_deleter()(__p);

      }

      void

      swap(unique_ptr& __u)

      {

        using std::swap;

        swap(_M_t, __u._M_t);

      }

      // Disable copy from lvalue.

      unique_ptr(const unique_ptr&) = delete;

      unique_ptr& operator=(const unique_ptr&) = delete;

    private:

      __tuple_type _M_t;

  };

  /// 20.7.12.3 unique_ptr for array objects with a runtime length

  // [unique.ptr.runtime]

  // _GLIBCXX_RESOLVE_LIB_DEFECTS

  // DR 740 - omit specialization for array objects with a compile time length

  template<typename _Tp, typename _Tp_Deleter>

    class unique_ptr<_Tp[], _Tp_Deleter>

    {

      typedef std::tuple<_Tp*, _Tp_Deleter>  __tuple_type;

      typedef _Tp* unique_ptr::*             __unspecified_pointer_type;

    public:

      typedef _Tp*               pointer;

      typedef _Tp                element_type;

      typedef _Tp_Deleter        deleter_type;

      // Constructors.

      unique_ptr()

      : _M_t(pointer(), deleter_type())

      { static_assert(!std::is_pointer<deleter_type>::value,

                      "constructed with null function pointer deleter"); }

      explicit

      unique_ptr(pointer __p)

      : _M_t(__p, deleter_type())

      { static_assert(!std::is_pointer<deleter_type>::value,

                      "constructed with null function pointer deleter"); }

      unique_ptr(pointer __p,

          typename std::conditional<std::is_reference<deleter_type>::value,

              deleter_type, const deleter_type&>::type __d)

      : _M_t(__p, __d) { }

      unique_ptr(pointer __p,

                 typename std::remove_reference<deleter_type>::type && __d)

      : _M_t(std::move(__p), std::move(__d))

      { static_assert(!std::is_reference<deleter_type>::value,

                      "rvalue deleter bound to reference"); }

      // Move constructors.

      unique_ptr(unique_ptr&& __u)

      : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }

      template<typename _Up, typename _Up_Deleter>

        unique_ptr(unique_ptr<_Up, _Up_Deleter>&& __u)

        : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))

        { }

      // Destructor.

      ~unique_ptr() { reset(); }

      // Assignment.

      unique_ptr&

      operator=(unique_ptr&& __u)

      {

        reset(__u.release());

        get_deleter() = std::move(__u.get_deleter());

        return *this;

      }

      template<typename _Up, typename _Up_Deleter>

        unique_ptr&

        operator=(unique_ptr<_Up, _Up_Deleter>&& __u)

        {

          reset(__u.release());

          get_deleter() = std::move(__u.get_deleter());

          return *this;

        }

      unique_ptr&

      operator=(__unspecified_pointer_type)

      {

        reset();

        return *this;

      }

      // Observers.

      typename std::add_lvalue_reference<element_type>::type

      operator[](size_t __i) const

      {

        _GLIBCXX_DEBUG_ASSERT(get() != pointer());

        return get()[__i];

      }

      pointer

      get() const

      { return std::get<0>(_M_t); }

      deleter_type&

      get_deleter()

      { return std::get<1>(_M_t); }

      const deleter_type&

      get_deleter() const

      { return std::get<1>(_M_t); }

      explicit operator bool() const

      { return get() == pointer() ? false : true; }

      // Modifiers.

      pointer

      release()

      {

        pointer __p = get();

        std::get<0>(_M_t) = pointer();

        return __p;

      }

      void

      reset(pointer __p = pointer())

      {

        using std::swap;

        swap(std::get<0>(_M_t), __p);

        if (__p != pointer())

          get_deleter()(__p);

      }

      // DR 821.

      template<typename _Up>

        void reset(_Up) = delete;

      void

      swap(unique_ptr& __u)

      {

        using std::swap;

        swap(_M_t, __u._M_t);

      }

      // Disable copy from lvalue.

      unique_ptr(const unique_ptr&) = delete;

      unique_ptr& operator=(const unique_ptr&) = delete;

      // Disable construction from convertible pointer types.

      // (N2315 - 20.6.5.3.1)

      template<typename _Up>

        unique_ptr(_Up*, typename

                   std::conditional<std::is_reference<deleter_type>::value,

                   deleter_type, const deleter_type&>::type,

                   typename std::enable_if<std::is_convertible<_Up*,

                   pointer>::value>::type* = 0) = delete;

      template<typename _Up>

        unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,

                   typename std::enable_if<std::is_convertible<_Up*,

                   pointer>::value>::type* = 0) = delete;

      template<typename _Up>

        explicit

        unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,

                   pointer>::value>::type* = 0) = delete;

    private:

      __tuple_type _M_t;

  };

  template<typename _Tp, typename _Tp_Deleter>

    inline void

    swap(unique_ptr<_Tp, _Tp_Deleter>& __x,

         unique_ptr<_Tp, _Tp_Deleter>& __y)

    { __x.swap(__y); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator==(const unique_ptr<_Tp, _Tp_Deleter>& __x,

               const unique_ptr<_Up, _Up_Deleter>& __y)

    { return __x.get() == __y.get(); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator!=(const unique_ptr<_Tp, _Tp_Deleter>& __x,

               const unique_ptr<_Up, _Up_Deleter>& __y)

    { return !(__x.get() == __y.get()); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator<(const unique_ptr<_Tp, _Tp_Deleter>& __x,

              const unique_ptr<_Up, _Up_Deleter>& __y)

    { return __x.get() < __y.get(); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator<=(const unique_ptr<_Tp, _Tp_Deleter>& __x,

               const unique_ptr<_Up, _Up_Deleter>& __y)

    { return !(__y.get() < __x.get()); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator>(const unique_ptr<_Tp, _Tp_Deleter>& __x,

              const unique_ptr<_Up, _Up_Deleter>& __y)

    { return __y.get() < __x.get(); }

  template<typename _Tp, typename _Tp_Deleter,

           typename _Up, typename _Up_Deleter>

    inline bool

    operator>=(const unique_ptr<_Tp, _Tp_Deleter>& __x,

               const unique_ptr<_Up, _Up_Deleter>& __y)

    { return !(__x.get() < __y.get()); }

  // @} group pointer_abstractions

_GLIBCXX_END_NAMESPACE

#endif /* _UNIQUE_PTR_H */