1 /* 2 * Copyright 2019 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 #pragma once 18 19 #include "bind.h" 20 #include "callback.h" 21 #include "i_postable_context.h" 22 23 namespace bluetooth { 24 namespace common { 25 26 template <typename R, typename... Args> 27 class ContextualOnceCallback; 28 29 // A callback bound to an execution context that can be invoked only once. 30 template <typename R, typename... Args> 31 class ContextualOnceCallback<R(Args...)> { 32 public: ContextualOnceCallback(common::OnceCallback<R (Args...)> && callback,IPostableContext * context)33 ContextualOnceCallback(common::OnceCallback<R(Args...)>&& callback, IPostableContext* context) 34 : callback_(std::move(callback)), context_(context) {} 35 36 constexpr ContextualOnceCallback() = default; 37 ContextualOnceCallback(const ContextualOnceCallback&) = delete; 38 ContextualOnceCallback& operator=(const ContextualOnceCallback&) = delete; 39 40 ContextualOnceCallback(ContextualOnceCallback&&) noexcept = default; 41 ContextualOnceCallback& operator=(ContextualOnceCallback&&) noexcept = default; 42 operator()43 void operator()(Args... args) { 44 context_->Post(common::BindOnce(std::move(callback_), std::forward<Args>(args)...)); 45 } 46 47 operator bool() const { return context_ && callback_; } 48 49 private: 50 common::OnceCallback<R(Args...)> callback_; 51 IPostableContext* context_; 52 }; 53 54 template <typename Callback> 55 ContextualOnceCallback(Callback&& callback, IPostableContext* context) 56 -> ContextualOnceCallback<typename Callback::RunType>; 57 58 template <typename R, typename... Args> 59 class ContextualCallback; 60 61 // A callback bound to an execution context that can be invoked multiple times. 62 template <typename R, typename... Args> 63 class ContextualCallback<R(Args...)> { 64 public: ContextualCallback(common::Callback<R (Args...)> && callback,IPostableContext * context)65 ContextualCallback(common::Callback<R(Args...)>&& callback, IPostableContext* context) 66 : callback_(std::move(callback)), context_(context) {} 67 68 constexpr ContextualCallback() = default; 69 70 ContextualCallback(const ContextualCallback&) = default; 71 ContextualCallback& operator=(const ContextualCallback&) = default; 72 ContextualCallback(ContextualCallback&&) noexcept = default; 73 ContextualCallback& operator=(ContextualCallback&&) noexcept = default; 74 operator()75 void operator()(Args... args) { 76 context_->Post(common::BindOnce(callback_, std::forward<Args>(args)...)); 77 } 78 79 operator bool() const { return context_ && callback_; } 80 81 private: 82 common::Callback<R(Args...)> callback_; 83 IPostableContext* context_; 84 }; 85 86 template <typename Callback> 87 ContextualCallback(Callback&& callback, 88 IPostableContext* context) -> ContextualCallback<typename Callback::RunType>; 89 90 } // namespace common 91 } // namespace bluetooth 92