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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libstdc++-v3/] [include/] [bits/] [unique_ptr.h] - Rev 424
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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 */