sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 1 | // This file was GENERATED by command: |
| 2 | // pump.py callback.h.pump |
| 3 | // DO NOT EDIT BY HAND!!! |
| 4 | |
| 5 | /* |
| 6 | * libjingle |
| 7 | * Copyright 2012 Google Inc. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright notice, |
| 13 | * this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 15 | * this list of conditions and the following disclaimer in the documentation |
| 16 | * and/or other materials provided with the distribution. |
| 17 | * 3. The name of the author may not be used to endorse or promote products |
| 18 | * derived from this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 23 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 26 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 28 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 29 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | // To generate callback.h from callback.h.pump, execute: |
| 33 | // /home/build/google3/third_party/gtest/scripts/pump.py callback.h.pump |
| 34 | |
| 35 | // Callbacks are callable object containers. They can hold a function pointer |
| 36 | // or a function object and behave like a value type. Internally, data is |
| 37 | // reference-counted, making copies and pass-by-value inexpensive. |
| 38 | // |
| 39 | // Callbacks are typed using template arguments. The format is: |
| 40 | // CallbackN<ReturnType, ParamType1, ..., ParamTypeN> |
| 41 | // where N is the number of arguments supplied to the callable object. |
| 42 | // Callbacks are invoked using operator(), just like a function or a function |
| 43 | // object. Default-constructed callbacks are "empty," and executing an empty |
| 44 | // callback does nothing. A callback can be made empty by assigning it from |
| 45 | // a default-constructed callback. |
| 46 | // |
| 47 | // Callbacks are similar in purpose to std::function (which isn't available on |
| 48 | // all platforms we support) and a lightweight alternative to sigslots. Since |
| 49 | // they effectively hide the type of the object they call, they're useful in |
| 50 | // breaking dependencies between objects that need to interact with one another. |
| 51 | // Notably, they can hold the results of Bind(), std::bind*, etc, without |
| 52 | // needing |
| 53 | // to know the resulting object type of those calls. |
| 54 | // |
| 55 | // Sigslots, on the other hand, provide a fuller feature set, such as multiple |
| 56 | // subscriptions to a signal, optional thread-safety, and lifetime tracking of |
| 57 | // slots. When these features are needed, choose sigslots. |
| 58 | // |
| 59 | // Example: |
| 60 | // int sqr(int x) { return x * x; } |
| 61 | // struct AddK { |
| 62 | // int k; |
| 63 | // int operator()(int x) const { return x + k; } |
| 64 | // } add_k = {5}; |
| 65 | // |
| 66 | // Callback1<int, int> my_callback; |
| 67 | // cout << my_callback.empty() << endl; // true |
| 68 | // |
| 69 | // my_callback = Callback1<int, int>(&sqr); |
| 70 | // cout << my_callback.empty() << endl; // false |
| 71 | // cout << my_callback(3) << endl; // 9 |
| 72 | // |
| 73 | // my_callback = Callback1<int, int>(add_k); |
| 74 | // cout << my_callback(10) << endl; // 15 |
| 75 | // |
| 76 | // my_callback = Callback1<int, int>(); |
| 77 | // cout << my_callback.empty() << endl; // true |
| 78 | |
| 79 | #ifndef TALK_BASE_CALLBACK_H_ |
| 80 | #define TALK_BASE_CALLBACK_H_ |
| 81 | |
| 82 | #include "talk/base/logging.h" |
| 83 | #include "talk/base/refcount.h" |
| 84 | #include "talk/base/scoped_ref_ptr.h" |
| 85 | |
| 86 | namespace talk_base { |
| 87 | |
| 88 | template <class R> |
| 89 | class Callback0 { |
| 90 | public: |
| 91 | // Default copy operations are appropriate for this class. |
| 92 | Callback0() {} |
| 93 | template <class T> Callback0(const T& functor) |
| 94 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 95 | R operator()() { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 96 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 97 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 98 | return helper_->Run(); |
| 99 | } |
| 100 | bool empty() const { return !helper_; } |
| 101 | |
| 102 | private: |
| 103 | struct Helper : RefCountInterface { |
| 104 | virtual ~Helper() {} |
| 105 | virtual R Run() = 0; |
| 106 | }; |
| 107 | template <class T> struct HelperImpl : Helper { |
| 108 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 109 | virtual R Run() { |
| 110 | return functor_(); |
| 111 | } |
| 112 | T functor_; |
| 113 | }; |
| 114 | scoped_refptr<Helper> helper_; |
| 115 | }; |
| 116 | |
| 117 | template <class R, |
| 118 | class P1> |
| 119 | class Callback1 { |
| 120 | public: |
| 121 | // Default copy operations are appropriate for this class. |
| 122 | Callback1() {} |
| 123 | template <class T> Callback1(const T& functor) |
| 124 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 125 | R operator()(P1 p1) { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 126 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 127 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 128 | return helper_->Run(p1); |
| 129 | } |
| 130 | bool empty() const { return !helper_; } |
| 131 | |
| 132 | private: |
| 133 | struct Helper : RefCountInterface { |
| 134 | virtual ~Helper() {} |
| 135 | virtual R Run(P1 p1) = 0; |
| 136 | }; |
| 137 | template <class T> struct HelperImpl : Helper { |
| 138 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 139 | virtual R Run(P1 p1) { |
| 140 | return functor_(p1); |
| 141 | } |
| 142 | T functor_; |
| 143 | }; |
| 144 | scoped_refptr<Helper> helper_; |
| 145 | }; |
| 146 | |
| 147 | template <class R, |
| 148 | class P1, |
| 149 | class P2> |
| 150 | class Callback2 { |
| 151 | public: |
| 152 | // Default copy operations are appropriate for this class. |
| 153 | Callback2() {} |
| 154 | template <class T> Callback2(const T& functor) |
| 155 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 156 | R operator()(P1 p1, P2 p2) { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 157 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 158 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 159 | return helper_->Run(p1, p2); |
| 160 | } |
| 161 | bool empty() const { return !helper_; } |
| 162 | |
| 163 | private: |
| 164 | struct Helper : RefCountInterface { |
| 165 | virtual ~Helper() {} |
| 166 | virtual R Run(P1 p1, P2 p2) = 0; |
| 167 | }; |
| 168 | template <class T> struct HelperImpl : Helper { |
| 169 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 170 | virtual R Run(P1 p1, P2 p2) { |
| 171 | return functor_(p1, p2); |
| 172 | } |
| 173 | T functor_; |
| 174 | }; |
| 175 | scoped_refptr<Helper> helper_; |
| 176 | }; |
| 177 | |
| 178 | template <class R, |
| 179 | class P1, |
| 180 | class P2, |
| 181 | class P3> |
| 182 | class Callback3 { |
| 183 | public: |
| 184 | // Default copy operations are appropriate for this class. |
| 185 | Callback3() {} |
| 186 | template <class T> Callback3(const T& functor) |
| 187 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 188 | R operator()(P1 p1, P2 p2, P3 p3) { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 189 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 190 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 191 | return helper_->Run(p1, p2, p3); |
| 192 | } |
| 193 | bool empty() const { return !helper_; } |
| 194 | |
| 195 | private: |
| 196 | struct Helper : RefCountInterface { |
| 197 | virtual ~Helper() {} |
| 198 | virtual R Run(P1 p1, P2 p2, P3 p3) = 0; |
| 199 | }; |
| 200 | template <class T> struct HelperImpl : Helper { |
| 201 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 202 | virtual R Run(P1 p1, P2 p2, P3 p3) { |
| 203 | return functor_(p1, p2, p3); |
| 204 | } |
| 205 | T functor_; |
| 206 | }; |
| 207 | scoped_refptr<Helper> helper_; |
| 208 | }; |
| 209 | |
| 210 | template <class R, |
| 211 | class P1, |
| 212 | class P2, |
| 213 | class P3, |
| 214 | class P4> |
| 215 | class Callback4 { |
| 216 | public: |
| 217 | // Default copy operations are appropriate for this class. |
| 218 | Callback4() {} |
| 219 | template <class T> Callback4(const T& functor) |
| 220 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 221 | R operator()(P1 p1, P2 p2, P3 p3, P4 p4) { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 222 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 223 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 224 | return helper_->Run(p1, p2, p3, p4); |
| 225 | } |
| 226 | bool empty() const { return !helper_; } |
| 227 | |
| 228 | private: |
| 229 | struct Helper : RefCountInterface { |
| 230 | virtual ~Helper() {} |
| 231 | virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) = 0; |
| 232 | }; |
| 233 | template <class T> struct HelperImpl : Helper { |
| 234 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 235 | virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) { |
| 236 | return functor_(p1, p2, p3, p4); |
| 237 | } |
| 238 | T functor_; |
| 239 | }; |
| 240 | scoped_refptr<Helper> helper_; |
| 241 | }; |
| 242 | |
| 243 | template <class R, |
| 244 | class P1, |
| 245 | class P2, |
| 246 | class P3, |
| 247 | class P4, |
| 248 | class P5> |
| 249 | class Callback5 { |
| 250 | public: |
| 251 | // Default copy operations are appropriate for this class. |
| 252 | Callback5() {} |
| 253 | template <class T> Callback5(const T& functor) |
| 254 | : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {} |
| 255 | R operator()(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) { |
sergeyu@chromium.org | 9d89162 | 2014-02-08 03:18:03 +0000 | [diff] [blame] | 256 | if (empty()) |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 257 | return R(); |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 258 | return helper_->Run(p1, p2, p3, p4, p5); |
| 259 | } |
| 260 | bool empty() const { return !helper_; } |
| 261 | |
| 262 | private: |
| 263 | struct Helper : RefCountInterface { |
| 264 | virtual ~Helper() {} |
| 265 | virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) = 0; |
| 266 | }; |
| 267 | template <class T> struct HelperImpl : Helper { |
| 268 | explicit HelperImpl(const T& functor) : functor_(functor) {} |
| 269 | virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) { |
| 270 | return functor_(p1, p2, p3, p4, p5); |
| 271 | } |
| 272 | T functor_; |
| 273 | }; |
| 274 | scoped_refptr<Helper> helper_; |
| 275 | }; |
| 276 | } // namespace talk_base |
| 277 | |
sergeyu@chromium.org | 70022fa | 2014-02-07 19:03:26 +0000 | [diff] [blame] | 278 | #endif // TALK_BASE_CALLBACK_H_ |