Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | // <memory> |
| 11 | |
| 12 | // unique_ptr |
| 13 | |
| 14 | // Example move-only deleter |
| 15 | |
| 16 | #ifndef DELETER_H |
| 17 | #define DELETER_H |
| 18 | |
| 19 | #include <type_traits> |
| 20 | #include <cassert> |
| 21 | |
| 22 | template <class T> |
| 23 | class Deleter |
| 24 | { |
| 25 | int state_; |
| 26 | |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 27 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 28 | Deleter(const Deleter&); |
| 29 | Deleter& operator=(const Deleter&); |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 30 | #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 31 | Deleter(Deleter&); |
| 32 | Deleter& operator=(Deleter&); |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 33 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 34 | |
| 35 | public: |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 36 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 37 | Deleter(Deleter&& r) : state_(r.state_) {r.state_ = 0;} |
| 38 | Deleter& operator=(Deleter&& r) |
| 39 | { |
| 40 | state_ = r.state_; |
| 41 | r.state_ = 0; |
| 42 | return *this; |
| 43 | } |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 44 | #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 45 | operator std::__rv<Deleter>() {return std::__rv<Deleter>(*this);} |
| 46 | Deleter(std::__rv<Deleter> r) : state_(r->state_) {r->state_ = 0;} |
| 47 | Deleter& operator=(std::__rv<Deleter> r) |
| 48 | { |
| 49 | state_ = r->state_; |
| 50 | r->state_ = 0; |
| 51 | return *this; |
| 52 | } |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 53 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 54 | |
| 55 | Deleter() : state_(0) {} |
| 56 | explicit Deleter(int s) : state_(s) {} |
| 57 | ~Deleter() {assert(state_ >= 0); state_ = -1;} |
| 58 | |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 59 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 60 | template <class U> |
| 61 | Deleter(Deleter<U>&& d, |
| 62 | typename std::enable_if<!std::is_same<U, T>::value>::type* = 0) |
| 63 | : state_(d.state()) {d.set_state(0);} |
| 64 | |
| 65 | private: |
| 66 | template <class U> |
| 67 | Deleter(const Deleter<U>& d, |
| 68 | typename std::enable_if<!std::is_same<U, T>::value>::type* = 0); |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 69 | #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 70 | template <class U> |
| 71 | Deleter(Deleter<U> d, |
| 72 | typename std::enable_if<!std::is_same<U, T>::value>::type* = 0) |
| 73 | : state_(d.state()) {} |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 74 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 75 | public: |
| 76 | int state() const {return state_;} |
| 77 | void set_state(int i) {state_ = i;} |
| 78 | |
| 79 | void operator()(T* p) {delete p;} |
| 80 | }; |
| 81 | |
| 82 | template <class T> |
| 83 | class Deleter<T[]> |
| 84 | { |
| 85 | int state_; |
| 86 | |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 87 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 88 | Deleter(const Deleter&); |
| 89 | Deleter& operator=(const Deleter&); |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 90 | #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 91 | Deleter(Deleter&); |
| 92 | Deleter& operator=(Deleter&); |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 93 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 94 | |
| 95 | public: |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 96 | #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 97 | Deleter(Deleter&& r) : state_(r.state_) {r.state_ = 0;} |
| 98 | Deleter& operator=(Deleter&& r) |
| 99 | { |
| 100 | state_ = r.state_; |
| 101 | r.state_ = 0; |
| 102 | return *this; |
| 103 | } |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 104 | #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 105 | operator std::__rv<Deleter>() {return std::__rv<Deleter>(*this);} |
| 106 | Deleter(std::__rv<Deleter> r) : state_(r->state_) {r->state_ = 0;} |
| 107 | Deleter& operator=(std::__rv<Deleter> r) |
| 108 | { |
| 109 | state_ = r->state_; |
| 110 | r->state_ = 0; |
| 111 | return *this; |
| 112 | } |
Howard Hinnant | 73d21a4 | 2010-09-04 23:28:19 +0000 | [diff] [blame^] | 113 | #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES |
Howard Hinnant | c52f43e | 2010-08-22 00:59:46 +0000 | [diff] [blame] | 114 | |
| 115 | Deleter() : state_(0) {} |
| 116 | explicit Deleter(int s) : state_(s) {} |
| 117 | ~Deleter() {assert(state_ >= 0); state_ = -1;} |
| 118 | |
| 119 | int state() const {return state_;} |
| 120 | void set_state(int i) {state_ = i;} |
| 121 | |
| 122 | void operator()(T* p) {delete [] p;} |
| 123 | }; |
| 124 | |
| 125 | template <class T> |
| 126 | void |
| 127 | swap(Deleter<T>& x, Deleter<T>& y) |
| 128 | { |
| 129 | Deleter<T> t(std::move(x)); |
| 130 | x = std::move(y); |
| 131 | y = std::move(t); |
| 132 | } |
| 133 | |
| 134 | template <class T> |
| 135 | class CDeleter |
| 136 | { |
| 137 | int state_; |
| 138 | |
| 139 | public: |
| 140 | |
| 141 | CDeleter() : state_(0) {} |
| 142 | explicit CDeleter(int s) : state_(s) {} |
| 143 | ~CDeleter() {assert(state_ >= 0); state_ = -1;} |
| 144 | |
| 145 | template <class U> |
| 146 | CDeleter(const CDeleter<U>& d) |
| 147 | : state_(d.state()) {} |
| 148 | |
| 149 | int state() const {return state_;} |
| 150 | void set_state(int i) {state_ = i;} |
| 151 | |
| 152 | void operator()(T* p) {delete p;} |
| 153 | }; |
| 154 | |
| 155 | template <class T> |
| 156 | class CDeleter<T[]> |
| 157 | { |
| 158 | int state_; |
| 159 | |
| 160 | public: |
| 161 | |
| 162 | CDeleter() : state_(0) {} |
| 163 | explicit CDeleter(int s) : state_(s) {} |
| 164 | ~CDeleter() {assert(state_ >= 0); state_ = -1;} |
| 165 | |
| 166 | int state() const {return state_;} |
| 167 | void set_state(int i) {state_ = i;} |
| 168 | |
| 169 | void operator()(T* p) {delete [] p;} |
| 170 | }; |
| 171 | |
| 172 | template <class T> |
| 173 | void |
| 174 | swap(CDeleter<T>& x, CDeleter<T>& y) |
| 175 | { |
| 176 | CDeleter<T> t(std::move(x)); |
| 177 | x = std::move(y); |
| 178 | y = std::move(t); |
| 179 | } |
| 180 | |
| 181 | #endif // DELETER_H |