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+// unique_ptr implementation -*- C++ -*-
+
+// Copyright (C) 2008, 2009, 2010, 2011 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 bits/unique_ptr.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{memory}
+ */
+
+#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>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @addtogroup pointer_abstractions
+ * @{
+ */
+
+ /// Primary template, default_delete.
+ template<typename _Tp>
+ struct default_delete
+ {
+ constexpr default_delete() = default;
+
+ template<typename _Up, typename = typename
+ std::enable_if<std::is_convertible<_Up*, _Tp*>::value>::type>
+ 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[]>
+ {
+ constexpr default_delete() = default;
+
+ void
+ operator()(_Tp* __ptr) const
+ {
+ static_assert(sizeof(_Tp)>0,
+ "can't delete pointer to incomplete type");
+ delete [] __ptr;
+ }
+
+ template<typename _Up> void operator()(_Up*) const = delete;
+ };
+
+ /// 20.7.12.2 unique_ptr for single objects.
+ template <typename _Tp, typename _Dp = default_delete<_Tp> >
+ class unique_ptr
+ {
+ // use SFINAE to determine whether _Del::pointer exists
+ class _Pointer
+ {
+ template<typename _Up>
+ static typename _Up::pointer __test(typename _Up::pointer*);
+
+ template<typename _Up>
+ static _Tp* __test(...);
+
+ typedef typename remove_reference<_Dp>::type _Del;
+
+ public:
+ typedef decltype( __test<_Del>(0)) type;
+ };
+
+ typedef std::tuple<typename _Pointer::type, _Dp> __tuple_type;
+ __tuple_type _M_t;
+
+ public:
+ typedef typename _Pointer::type pointer;
+ typedef _Tp element_type;
+ typedef _Dp deleter_type;
+
+ // Constructors.
+ constexpr unique_ptr()
+ : _M_t()
+ { 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"); }
+
+ constexpr unique_ptr(nullptr_t)
+ : _M_t()
+ { static_assert(!std::is_pointer<deleter_type>::value,
+ "constructed with null function pointer deleter"); }
+
+ // Move constructors.
+ unique_ptr(unique_ptr&& __u)
+ : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
+
+ template<typename _Up, typename _Ep, typename = typename
+ std::enable_if
+ <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
+ pointer>::value
+ && !std::is_array<_Up>::value
+ && ((std::is_reference<_Dp>::value
+ && std::is_same<_Ep, _Dp>::value)
+ || (!std::is_reference<_Dp>::value
+ && std::is_convertible<_Ep, _Dp>::value))>
+ ::type>
+ unique_ptr(unique_ptr<_Up, _Ep>&& __u)
+ : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
+ { }
+
+#if _GLIBCXX_USE_DEPRECATED
+ template<typename _Up, typename = typename
+ std::enable_if<std::is_convertible<_Up*, _Tp*>::value
+ && std::is_same<_Dp,
+ default_delete<_Tp>>::value>::type>
+ unique_ptr(auto_ptr<_Up>&& __u)
+ : _M_t(__u.release(), deleter_type()) { }
+#endif
+
+ // Destructor.
+ ~unique_ptr() { reset(); }
+
+ // Assignment.
+ unique_ptr&
+ operator=(unique_ptr&& __u)
+ {
+ reset(__u.release());
+ get_deleter() = std::forward<deleter_type>(__u.get_deleter());
+ return *this;
+ }
+
+ template<typename _Up, typename _Ep, typename = typename
+ std::enable_if
+ <std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
+ pointer>::value
+ && !std::is_array<_Up>::value>::type>
+ unique_ptr&
+ operator=(unique_ptr<_Up, _Ep>&& __u)
+ {
+ reset(__u.release());
+ get_deleter() = std::forward<_Ep>(__u.get_deleter());
+ return *this;
+ }
+
+ unique_ptr&
+ operator=(nullptr_t)
+ {
+ 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;
+ };
+
+ /// 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 _Dp>
+ class unique_ptr<_Tp[], _Dp>
+ {
+ typedef std::tuple<_Tp*, _Dp> __tuple_type;
+ __tuple_type _M_t;
+
+ public:
+ typedef _Tp* pointer;
+ typedef _Tp element_type;
+ typedef _Dp deleter_type;
+
+ // Constructors.
+ constexpr unique_ptr()
+ : _M_t()
+ { 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"); }
+
+ constexpr unique_ptr(nullptr_t)
+ : _M_t()
+ { static_assert(!std::is_pointer<deleter_type>::value,
+ "constructed with null function pointer deleter"); }
+
+ // Move constructors.
+ unique_ptr(unique_ptr&& __u)
+ : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
+
+ template<typename _Up, typename _Ep>
+ unique_ptr(unique_ptr<_Up, _Ep>&& __u)
+ : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
+ { }
+
+ // Destructor.
+ ~unique_ptr() { reset(); }
+
+ // Assignment.
+ unique_ptr&
+ operator=(unique_ptr&& __u)
+ {
+ reset(__u.release());
+ get_deleter() = std::forward<deleter_type>(__u.get_deleter());
+ return *this;
+ }
+
+ template<typename _Up, typename _Ep>
+ unique_ptr&
+ operator=(unique_ptr<_Up, _Ep>&& __u)
+ {
+ reset(__u.release());
+ get_deleter() = std::forward<_Ep>(__u.get_deleter());
+ return *this;
+ }
+
+ unique_ptr&
+ operator=(nullptr_t)
+ {
+ 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 != nullptr)
+ get_deleter()(__p);
+ }
+
+ void
+ reset(nullptr_t)
+ {
+ pointer __p = get();
+ std::get<0>(_M_t) = pointer();
+ if (__p != nullptr)
+ 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;
+ };
+
+ template<typename _Tp, typename _Dp>
+ inline void
+ swap(unique_ptr<_Tp, _Dp>& __x,
+ unique_ptr<_Tp, _Dp>& __y)
+ { __x.swap(__y); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator==(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return __x.get() == __y.get(); }
+
+ template<typename _Tp, typename _Dp>
+ inline bool
+ operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
+ { return __x.get() == nullptr; }
+
+ template<typename _Tp, typename _Dp>
+ inline bool
+ operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
+ { return nullptr == __y.get(); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator!=(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return !(__x.get() == __y.get()); }
+
+ template<typename _Tp, typename _Dp>
+ inline bool
+ operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
+ { return __x.get() != nullptr; }
+
+ template<typename _Tp, typename _Dp>
+ inline bool
+ operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
+ { return nullptr != __y.get(); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator<(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return __x.get() < __y.get(); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator<=(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return !(__y.get() < __x.get()); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator>(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return __y.get() < __x.get(); }
+
+ template<typename _Tp, typename _Dp,
+ typename _Up, typename _Ep>
+ inline bool
+ operator>=(const unique_ptr<_Tp, _Dp>& __x,
+ const unique_ptr<_Up, _Ep>& __y)
+ { return !(__x.get() < __y.get()); }
+
+ /// std::hash specialization for unique_ptr.
+ template<typename _Tp, typename _Dp>
+ struct hash<unique_ptr<_Tp, _Dp>>
+ : public std::unary_function<unique_ptr<_Tp, _Dp>, size_t>
+ {
+ size_t
+ operator()(const unique_ptr<_Tp, _Dp>& __u) const
+ {
+ typedef unique_ptr<_Tp, _Dp> _UP;
+ return std::hash<typename _UP::pointer>()(__u.get());
+ }
+ };
+
+ // @} group pointer_abstractions
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif /* _UNIQUE_PTR_H */
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