1 /* 2 * Copyright (C) 2016 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 #ifndef CUTTLEFISH_COMMON_COMMON_LIBS_THREADS_THUNKERS_H_ 17 #define CUTTLEFISH_COMMON_COMMON_LIBS_THREADS_THUNKERS_H_ 18 19 namespace cvd { 20 namespace internal { 21 22 template <typename HalType, typename F> 23 struct ThunkerImpl; 24 25 template <typename HalType, typename Impl, typename R, typename... Args> 26 struct ThunkerImpl<HalType, R (Impl::*)(Args...)> { 27 template <R (Impl::*MemFn)(Args...)> 28 static R call(HalType* in, Args... args) { 29 return (reinterpret_cast<Impl*>(in)->*MemFn)(args...); 30 } 31 }; 32 33 template <typename HalType, typename Impl, typename R, typename... Args> 34 struct ThunkerImpl<HalType, R (Impl::*)(Args...) const> { 35 template <R (Impl::*MemFn)(Args...) const> 36 static R call(const HalType* in, Args... args) { 37 return (reinterpret_cast<const Impl*>(in)->*MemFn)(args...); 38 } 39 }; 40 41 template <typename HalType, auto MemFunc> 42 struct Thunker { 43 static constexpr auto call = 44 ThunkerImpl<HalType, decltype(MemFunc)>::template call<MemFunc>; 45 }; 46 47 } // namespace internal 48 49 template <typename HalType, auto MemFunc> 50 constexpr auto thunk = internal::Thunker<HalType, MemFunc>::call; 51 52 } // namespace cvd 53 54 #endif 55