forked from Kistler-Group/sdbus-cpp
d8fd053714
* Add preliminary changes for async server methods * Refactor the Message concept and break it into distinctive types * Continue working on async server methods (high-level API mainly) * Continue developing support for async server * Finishing async server methods * Finishing async server methods (fixing tests & cleaning up) * A little code cleaning * Add unit tests for type traits of free functions * Support for generating async server methods in stub headers * Update ChangeLog for v0.3.0 * Update the tutorial with how to use async server-side methods * Update the TOC in sdbus-c++ tutorial * Update numbering in TOC * Remove unnecessary code * Final cleanups
127 lines
3.6 KiB
C++
Executable File
127 lines
3.6 KiB
C++
Executable File
/**
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* (C) 2017 KISTLER INSTRUMENTE AG, Winterthur, Switzerland
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*
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* @file ConvenienceClasses.h
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*
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* Created on: Nov 8, 2016
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* Project: sdbus-c++
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* Description: High-level D-Bus IPC C++ library based on sd-bus
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*
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* This file is part of sdbus-c++.
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*
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* sdbus-c++ is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* sdbus-c++ is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with sdbus-c++. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SDBUS_CXX_METHODRESULT_H_
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#define SDBUS_CXX_METHODRESULT_H_
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#include <sdbus-c++/Message.h>
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#include <cassert>
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// Forward declaration
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namespace sdbus {
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namespace internal {
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class Object;
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}
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class Error;
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}
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namespace sdbus {
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/********************************************//**
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* @class MethodResult
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*
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* Represents result of an asynchronous server-side method.
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* An instance is provided to the method and shall be set
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* by the method to either method return value or an error.
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*
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***********************************************/
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class MethodResult
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{
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protected:
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friend sdbus::internal::Object;
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MethodResult() = default;
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MethodResult(const MethodCall& msg, sdbus::internal::Object& object);
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template <typename... _Results> void returnResults(const _Results&... results) const;
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void returnError(const Error& error) const;
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private:
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void send(const MethodReply& reply) const;
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private:
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MethodCall call_;
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sdbus::internal::Object* object_{};
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};
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template <typename... _Results>
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inline void MethodResult::returnResults(const _Results&... results) const
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{
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assert(call_.isValid());
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auto reply = call_.createReply();
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#ifdef __cpp_fold_expressions
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(reply << ... << results);
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#else
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using _ = std::initializer_list<int>;
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(void)_{(void(reply << results), 0)...};
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#endif
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send(reply);
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}
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inline void MethodResult::returnError(const Error& error) const
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{
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auto reply = call_.createErrorReply(error);
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send(reply);
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}
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/********************************************//**
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* @class Result
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*
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* Represents result of an asynchronous server-side method.
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* An instance is provided to the method and shall be set
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* by the method to either method return value or an error.
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*
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***********************************************/
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template <typename... _Results>
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class Result : protected MethodResult
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{
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public:
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Result() = default;
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Result(MethodResult result);
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void returnResults(const _Results&... results) const;
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void returnError(const Error& error) const;
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};
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template <typename... _Results>
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inline Result<_Results...>::Result(MethodResult result)
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: MethodResult(std::move(result))
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{
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}
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template <typename... _Results>
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inline void Result<_Results...>::returnResults(const _Results&... results) const
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{
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MethodResult::returnResults(results...);
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}
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template <typename... _Results>
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inline void Result<_Results...>::returnError(const Error& error) const
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{
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MethodResult::returnError(error);
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}
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}
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#endif /* SDBUS_CXX_METHODRESULT_H_ */
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