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Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/bits/unique_ptr.h')
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1 files changed, 781 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/include/bits/unique_ptr.h b/gcc-4.9/libstdc++-v3/include/bits/unique_ptr.h new file mode 100644 index 0000000..c72fbc7 --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/bits/unique_ptr.h @@ -0,0 +1,781 @@ +// unique_ptr implementation -*- C++ -*- + +// Copyright (C) 2008-2014 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 + * @{ + */ + +#if _GLIBCXX_USE_DEPRECATED + template<typename> class auto_ptr; +#endif + + /// Primary template of default_delete, used by unique_ptr + template<typename _Tp> + struct default_delete + { + /// Default constructor + constexpr default_delete() noexcept = default; + + /** @brief Converting constructor. + * + * Allows conversion from a deleter for arrays of another type, @p _Up, + * only if @p _Up* is convertible to @p _Tp*. + */ + template<typename _Up, typename = typename + enable_if<is_convertible<_Up*, _Tp*>::value>::type> + default_delete(const default_delete<_Up>&) noexcept { } + + /// Calls @c delete @p __ptr + void + operator()(_Tp* __ptr) const + { + static_assert(!is_void<_Tp>::value, + "can't delete pointer to incomplete type"); + 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 for arrays, default_delete. + template<typename _Tp> + struct default_delete<_Tp[]> + { + private: + template<typename _Up> + using __remove_cv = typename remove_cv<_Up>::type; + + // Like is_base_of<_Tp, _Up> but false if unqualified types are the same + template<typename _Up> + using __is_derived_Tp + = __and_< is_base_of<_Tp, _Up>, + __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >; + + public: + /// Default constructor + constexpr default_delete() noexcept = default; + + /** @brief Converting constructor. + * + * Allows conversion from a deleter for arrays of another type, such as + * a const-qualified version of @p _Tp. + * + * Conversions from types derived from @c _Tp are not allowed because + * it is unsafe to @c delete[] an array of derived types through a + * pointer to the base type. + */ + template<typename _Up, typename = typename + enable_if<!__is_derived_Tp<_Up>::value>::type> + default_delete(const default_delete<_Up[]>&) noexcept { } + + /// Calls @c delete[] @p __ptr + void + operator()(_Tp* __ptr) const + { + static_assert(sizeof(_Tp)>0, + "can't delete pointer to incomplete type"); + delete [] __ptr; + } + + template<typename _Up> + typename enable_if<__is_derived_Tp<_Up>::value>::type + operator()(_Up*) const = delete; + }; + + /// 20.7.1.2 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. + + /// Default constructor, creates a unique_ptr that owns nothing. + constexpr unique_ptr() noexcept + : _M_t() + { static_assert(!is_pointer<deleter_type>::value, + "constructed with null function pointer deleter"); } + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an object of @c element_type + * + * The deleter will be value-initialized. + */ + explicit + unique_ptr(pointer __p) noexcept + : _M_t(__p, deleter_type()) + { static_assert(!is_pointer<deleter_type>::value, + "constructed with null function pointer deleter"); } + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an object of @c element_type + * @param __d A reference to a deleter. + * + * The deleter will be initialized with @p __d + */ + unique_ptr(pointer __p, + typename conditional<is_reference<deleter_type>::value, + deleter_type, const deleter_type&>::type __d) noexcept + : _M_t(__p, __d) { } + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an object of @c element_type + * @param __d An rvalue reference to a deleter. + * + * The deleter will be initialized with @p std::move(__d) + */ + unique_ptr(pointer __p, + typename remove_reference<deleter_type>::type&& __d) noexcept + : _M_t(std::move(__p), std::move(__d)) + { static_assert(!std::is_reference<deleter_type>::value, + "rvalue deleter bound to reference"); } + + /// Creates a unique_ptr that owns nothing. + constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { } + + // Move constructors. + + /// Move constructor. + unique_ptr(unique_ptr&& __u) noexcept + : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { } + + /** @brief Converting constructor from another type + * + * Requires that the pointer owned by @p __u is convertible to the + * type of pointer owned by this object, @p __u does not own an array, + * and @p __u has a compatible deleter type. + */ + template<typename _Up, typename _Ep, typename = _Require< + is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>, + __not_<is_array<_Up>>, + typename conditional<is_reference<_Dp>::value, + is_same<_Ep, _Dp>, + is_convertible<_Ep, _Dp>>::type>> + unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept + : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) + { } + +#if _GLIBCXX_USE_DEPRECATED + /// Converting constructor from @c auto_ptr + template<typename _Up, typename = _Require< + is_convertible<_Up*, _Tp*>, is_same<_Dp, default_delete<_Tp>>>> + unique_ptr(auto_ptr<_Up>&& __u) noexcept; +#endif + + /// Destructor, invokes the deleter if the stored pointer is not null. + ~unique_ptr() noexcept + { + auto& __ptr = std::get<0>(_M_t); + if (__ptr != nullptr) + get_deleter()(__ptr); + __ptr = pointer(); + } + + // Assignment. + + /** @brief Move assignment operator. + * + * @param __u The object to transfer ownership from. + * + * Invokes the deleter first if this object owns a pointer. + */ + unique_ptr& + operator=(unique_ptr&& __u) noexcept + { + reset(__u.release()); + get_deleter() = std::forward<deleter_type>(__u.get_deleter()); + return *this; + } + + /** @brief Assignment from another type. + * + * @param __u The object to transfer ownership from, which owns a + * convertible pointer to a non-array object. + * + * Invokes the deleter first if this object owns a pointer. + */ + template<typename _Up, typename _Ep> + typename enable_if< __and_< + is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>, + __not_<is_array<_Up>> + >::value, + unique_ptr&>::type + operator=(unique_ptr<_Up, _Ep>&& __u) noexcept + { + reset(__u.release()); + get_deleter() = std::forward<_Ep>(__u.get_deleter()); + return *this; + } + + /// Reset the %unique_ptr to empty, invoking the deleter if necessary. + unique_ptr& + operator=(nullptr_t) noexcept + { + reset(); + return *this; + } + + // Observers. + + /// Dereference the stored pointer. + typename add_lvalue_reference<element_type>::type + operator*() const + { + _GLIBCXX_DEBUG_ASSERT(get() != pointer()); + return *get(); + } + + /// Return the stored pointer. + pointer + operator->() const noexcept + { + _GLIBCXX_DEBUG_ASSERT(get() != pointer()); + return get(); + } + + /// Return the stored pointer. + pointer + get() const noexcept + { return std::get<0>(_M_t); } + + /// Return a reference to the stored deleter. + deleter_type& + get_deleter() noexcept + { return std::get<1>(_M_t); } + + /// Return a reference to the stored deleter. + const deleter_type& + get_deleter() const noexcept + { return std::get<1>(_M_t); } + + /// Return @c true if the stored pointer is not null. + explicit operator bool() const noexcept + { return get() == pointer() ? false : true; } + + // Modifiers. + + /// Release ownership of any stored pointer. + pointer + release() noexcept + { + pointer __p = get(); + std::get<0>(_M_t) = pointer(); + return __p; + } + + /** @brief Replace the stored pointer. + * + * @param __p The new pointer to store. + * + * The deleter will be invoked if a pointer is already owned. + */ + void + reset(pointer __p = pointer()) noexcept + { + using std::swap; + swap(std::get<0>(_M_t), __p); + if (__p != pointer()) + get_deleter()(__p); + } + + /// Exchange the pointer and deleter with another object. + void + swap(unique_ptr& __u) noexcept + { + 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; + }; + + /// 20.7.1.3 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> + { + // 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; + + template<typename _Up> + using __remove_cv = typename remove_cv<_Up>::type; + + // like is_base_of<_Tp, _Up> but false if unqualified types are the same + template<typename _Up> + using __is_derived_Tp + = __and_< is_base_of<_Tp, _Up>, + __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >; + + template<typename _Up, typename _Ep, + typename _Tp_pointer = typename _Pointer::type, + typename _Up_pointer = typename unique_ptr<_Up, _Ep>::pointer> + using __safe_conversion = __and_< + is_convertible<_Up_pointer, _Tp_pointer>, + is_array<_Up>, + __or_<__not_<is_pointer<_Up_pointer>>, + __not_<is_pointer<_Tp_pointer>>, + __not_<__is_derived_Tp<typename remove_extent<_Up>::type>> + > + >; + + public: + typedef typename _Pointer::type pointer; + typedef _Tp element_type; + typedef _Dp deleter_type; + + // Constructors. + + /// Default constructor, creates a unique_ptr that owns nothing. + constexpr unique_ptr() noexcept + : _M_t() + { static_assert(!std::is_pointer<deleter_type>::value, + "constructed with null function pointer deleter"); } + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an array of @c element_type + * + * The deleter will be value-initialized. + */ + explicit + unique_ptr(pointer __p) noexcept + : _M_t(__p, deleter_type()) + { static_assert(!is_pointer<deleter_type>::value, + "constructed with null function pointer deleter"); } + + // Disable construction from convertible pointer types. + template<typename _Up, typename = _Require<is_pointer<pointer>, + is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> + explicit + unique_ptr(_Up* __p) = delete; + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an array of @c element_type + * @param __d A reference to a deleter. + * + * The deleter will be initialized with @p __d + */ + unique_ptr(pointer __p, + typename conditional<is_reference<deleter_type>::value, + deleter_type, const deleter_type&>::type __d) noexcept + : _M_t(__p, __d) { } + + /** Takes ownership of a pointer. + * + * @param __p A pointer to an array of @c element_type + * @param __d A reference to a deleter. + * + * The deleter will be initialized with @p std::move(__d) + */ + unique_ptr(pointer __p, typename + remove_reference<deleter_type>::type&& __d) noexcept + : _M_t(std::move(__p), std::move(__d)) + { static_assert(!is_reference<deleter_type>::value, + "rvalue deleter bound to reference"); } + + /// Move constructor. + unique_ptr(unique_ptr&& __u) noexcept + : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { } + + /// Creates a unique_ptr that owns nothing. + constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { } + + template<typename _Up, typename _Ep, + typename = _Require<__safe_conversion<_Up, _Ep>, + typename conditional<is_reference<_Dp>::value, + is_same<_Ep, _Dp>, + is_convertible<_Ep, _Dp>>::type + >> + unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept + : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) + { } + + /// Destructor, invokes the deleter if the stored pointer is not null. + ~unique_ptr() + { + auto& __ptr = std::get<0>(_M_t); + if (__ptr != nullptr) + get_deleter()(__ptr); + __ptr = pointer(); + } + + // Assignment. + + /** @brief Move assignment operator. + * + * @param __u The object to transfer ownership from. + * + * Invokes the deleter first if this object owns a pointer. + */ + unique_ptr& + operator=(unique_ptr&& __u) noexcept + { + reset(__u.release()); + get_deleter() = std::forward<deleter_type>(__u.get_deleter()); + return *this; + } + + /** @brief Assignment from another type. + * + * @param __u The object to transfer ownership from, which owns a + * convertible pointer to an array object. + * + * Invokes the deleter first if this object owns a pointer. + */ + template<typename _Up, typename _Ep> + typename + enable_if<__safe_conversion<_Up, _Ep>::value, unique_ptr&>::type + operator=(unique_ptr<_Up, _Ep>&& __u) noexcept + { + reset(__u.release()); + get_deleter() = std::forward<_Ep>(__u.get_deleter()); + return *this; + } + + /// Reset the %unique_ptr to empty, invoking the deleter if necessary. + unique_ptr& + operator=(nullptr_t) noexcept + { + reset(); + return *this; + } + + // Observers. + + /// Access an element of owned array. + typename std::add_lvalue_reference<element_type>::type + operator[](size_t __i) const + { + _GLIBCXX_DEBUG_ASSERT(get() != pointer()); + return get()[__i]; + } + + /// Return the stored pointer. + pointer + get() const noexcept + { return std::get<0>(_M_t); } + + /// Return a reference to the stored deleter. + deleter_type& + get_deleter() noexcept + { return std::get<1>(_M_t); } + + /// Return a reference to the stored deleter. + const deleter_type& + get_deleter() const noexcept + { return std::get<1>(_M_t); } + + /// Return @c true if the stored pointer is not null. + explicit operator bool() const noexcept + { return get() == pointer() ? false : true; } + + // Modifiers. + + /// Release ownership of any stored pointer. + pointer + release() noexcept + { + pointer __p = get(); + std::get<0>(_M_t) = pointer(); + return __p; + } + + /** @brief Replace the stored pointer. + * + * @param __p The new pointer to store. + * + * The deleter will be invoked if a pointer is already owned. + */ + void + reset(pointer __p = pointer()) noexcept + { + using std::swap; + swap(std::get<0>(_M_t), __p); + if (__p != nullptr) + get_deleter()(__p); + } + + // Disable resetting from convertible pointer types. + template<typename _Up, typename = _Require<is_pointer<pointer>, + is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> + void reset(_Up*) = delete; + + /// Exchange the pointer and deleter with another object. + void + swap(unique_ptr& __u) noexcept + { + 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. + template<typename _Up, typename = _Require<is_pointer<pointer>, + is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> + unique_ptr(_Up*, typename + conditional<is_reference<deleter_type>::value, + deleter_type, const deleter_type&>::type) = delete; + + // Disable construction from convertible pointer types. + template<typename _Up, typename = _Require<is_pointer<pointer>, + is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>> + unique_ptr(_Up*, typename + remove_reference<deleter_type>::type&&) = delete; + }; + + template<typename _Tp, typename _Dp> + inline void + swap(unique_ptr<_Tp, _Dp>& __x, + unique_ptr<_Tp, _Dp>& __y) noexcept + { __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) noexcept + { return !__x; } + + template<typename _Tp, typename _Dp> + inline bool + operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept + { return !__x; } + + 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) noexcept + { return (bool)__x; } + + template<typename _Tp, typename _Dp> + inline bool + operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept + { return (bool)__x; } + + template<typename _Tp, typename _Dp, + typename _Up, typename _Ep> + inline bool + operator<(const unique_ptr<_Tp, _Dp>& __x, + const unique_ptr<_Up, _Ep>& __y) + { + typedef typename + std::common_type<typename unique_ptr<_Tp, _Dp>::pointer, + typename unique_ptr<_Up, _Ep>::pointer>::type _CT; + return std::less<_CT>()(__x.get(), __y.get()); + } + + template<typename _Tp, typename _Dp> + inline bool + operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) + { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), + nullptr); } + + template<typename _Tp, typename _Dp> + inline bool + operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) + { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, + __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 < __x); } + + template<typename _Tp, typename _Dp> + inline bool + operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) + { return !(nullptr < __x); } + + template<typename _Tp, typename _Dp> + inline bool + operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) + { return !(__x < nullptr); } + + 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 < __x); } + + template<typename _Tp, typename _Dp> + inline bool + operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) + { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, + __x.get()); } + + template<typename _Tp, typename _Dp> + inline bool + operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) + { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), + nullptr); } + + 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 < __y); } + + template<typename _Tp, typename _Dp> + inline bool + operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) + { return !(__x < nullptr); } + + template<typename _Tp, typename _Dp> + inline bool + operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) + { return !(nullptr < __x); } + + /// std::hash specialization for unique_ptr. + template<typename _Tp, typename _Dp> + struct hash<unique_ptr<_Tp, _Dp>> + : public __hash_base<size_t, unique_ptr<_Tp, _Dp>> + { + size_t + operator()(const unique_ptr<_Tp, _Dp>& __u) const noexcept + { + typedef unique_ptr<_Tp, _Dp> _UP; + return std::hash<typename _UP::pointer>()(__u.get()); + } + }; + +#if __cplusplus > 201103L + template<typename _Tp> + struct _MakeUniq + { typedef unique_ptr<_Tp> __single_object; }; + + template<typename _Tp> + struct _MakeUniq<_Tp[]> + { typedef unique_ptr<_Tp[]> __array; }; + + template<typename _Tp, size_t _Bound> + struct _MakeUniq<_Tp[_Bound]> + { struct __invalid_type { }; }; + + /// std::make_unique for single objects + template<typename _Tp, typename... _Args> + inline typename _MakeUniq<_Tp>::__single_object + make_unique(_Args&&... __args) + { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); } + + /// std::make_unique for arrays of unknown bound + template<typename _Tp> + inline typename _MakeUniq<_Tp>::__array + make_unique(size_t __num) + { return unique_ptr<_Tp>(new typename remove_extent<_Tp>::type[__num]()); } + + /// Disable std::make_unique for arrays of known bound + template<typename _Tp, typename... _Args> + inline typename _MakeUniq<_Tp>::__invalid_type + make_unique(_Args&&...) = delete; +#endif + + // @} group pointer_abstractions + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace + +#endif /* _UNIQUE_PTR_H */ |