| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| #pragma once |
| |
| #include "pw_rpc/internal/nanopb_method.h" |
| |
| namespace pw::rpc::internal { |
| |
| // Identifies a base class from a member function it defines. This should be |
| // used with decltype to retrieve the base class. |
| template <typename T, typename U> |
| T BaseFromMember(U T::*); |
| |
| // Gets information about a service and method at compile-time. Uses a pointer |
| // to a member function of the service implementation to identify the service |
| // class, generated service class, and Method object.This class is friended by |
| // the generated service classes to give it access to the internal method list. |
| template <auto impl_method> |
| class ServiceMethodTraits { |
| public: |
| ServiceMethodTraits() = delete; |
| |
| // Type of the service implementation derived class. |
| using Service = typename internal::RpcTraits<decltype(impl_method)>::Service; |
| |
| // Type of the generic service base class. |
| using BaseService = |
| decltype(BaseFromMember(&Service::_PwRpcInternalGeneratedBase)); |
| |
| // Reference to the Method object corresponding to this method. |
| static constexpr const NanopbMethod& method() { |
| return *BaseService::template MethodFor<impl_method>(); |
| } |
| |
| static_assert(BaseService::template MethodFor<impl_method>() != nullptr, |
| "The selected function is not an RPC service method"); |
| }; |
| |
| } // namespace pw::rpc::internal |