79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <android/hidl/base/1.0/IBase.h>
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#include <functional>
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namespace android::hardware::hidl_utils {
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/**
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* Helper functor to fetch results from multi-return HIDL calls.
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* It's meant to be used in place of _hidl_cb callbacks.
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*
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* Please note extracting these return variables outside of the callback scope requires making
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* a copy of each return variable. This may be costly for frequently called HIDL methods with
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* non-negligible return object size. Please be cautious about performance when using this.
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*
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* Example usage:
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* Result result;
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* sp<ISomeInterface> iface;
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* hidlObject->someMethod(arg1, arg2, hidl_utils::fill(&result, &iface)).assertOk();
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* // use result and iface
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*/
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template <typename... T>
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struct fill : public std::function<void(const T&...)> {
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/**
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* Create _hidl_cb functor that copies the call arguments to specified pointers.
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*
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* \param args... Targets to copy the call arguments to
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*/
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fill(T*... args) : mTargets(args...) {}
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void operator()(const T&... args) { copy<0, T...>(args...); }
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private:
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std::tuple<T*...> mTargets;
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template <int Pos, typename First>
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inline void copy(const First& first) {
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*std::get<Pos>(mTargets) = first;
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}
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template <int Pos, typename First, typename... Rest>
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inline void copy(const First& first, const Rest&... rest) {
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*std::get<Pos>(mTargets) = first;
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copy<Pos + 1, Rest...>(rest...);
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}
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};
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/**
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* Link to a given HALs death and restart the current process in such a case.
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* \param hal HAL to which death to link
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*/
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void linkDeathToDeath(sp<hidl::base::V1_0::IBase> hal);
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/**
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* List HAL instances of a given interface.
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*
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* \descriptor HIDL HAL descriptor
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*/
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hidl_vec<hidl_string> listManifestByInterface(const char* descriptor);
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} // namespace android::hardware::hidl_utils
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