1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SCOPE_GUARD_H 18 #define SCOPE_GUARD_H 19 20 // TODO: include explicit std::move when it becomes available 21 template<typename F> 22 class ScopeGuard { 23 public: ScopeGuard(F f)24 ScopeGuard(F f) : f_(f), active_(true) {} 25 ScopeGuard(ScopeGuard && that)26 ScopeGuard(ScopeGuard&& that) : f_(that.f_), active_(that.active_) { 27 that.active_ = false; 28 } 29 ~ScopeGuard()30 ~ScopeGuard() { 31 if (active_) { 32 f_(); 33 } 34 } 35 disable()36 void disable() { 37 active_ = false; 38 } 39 private: 40 F f_; 41 bool active_; 42 43 ScopeGuard() = delete; 44 ScopeGuard(const ScopeGuard&) = delete; 45 ScopeGuard& operator=(const ScopeGuard&) = delete; 46 }; 47 48 template<typename T> create_scope_guard(T f)49ScopeGuard<T> create_scope_guard(T f) { 50 return ScopeGuard<T>(f); 51 } 52 53 #endif // SCOPE_GUARD_H 54