source.h

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/****************************************************************************
 *
 * fkie_message_filters
 * Copyright © 2018-2020 Fraunhofer FKIE
 * Author: Timo Röhling
 *
 * 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
 *
 *     http://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.
 *
 ****************************************************************************/
#ifndef INCLUDE_FKIE_MESSAGE_FILTERS_SOURCE_H_
#define INCLUDE_FKIE_MESSAGE_FILTERS_SOURCE_H_
 
#include "types.h"
#include "filter_base.h"
#include <boost/signals2.hpp>
 
namespace fkie_message_filters
{
 
template<typename...> class Sink;
 
template<typename... Outputs>
class Source : public virtual FilterBase
{
    template<typename...> friend class Sink;
public:
    static constexpr std::size_t NUM_OUTPUTS = sizeof...(Outputs);
    using Output = IO<Outputs...>;
 
    virtual ~Source() {}
    Connection connect_to_sink (Sink<Outputs...>& dst) noexcept;
    void disconnect_from_all_sinks() noexcept;
    virtual void disconnect() noexcept override;
protected:
    void send (const Outputs&... out);
private:
    boost::signals2::signal<void(const Outputs&...)> signal_;
};
 
template<typename... Outputs>
class Source<IO<Outputs...>> : public Source<Outputs...>
{
};
 
} // namespace fkie_message_filters
 
#include "sink.h"
#include "source_impl.h"
 
#endif /* INCLUDE_FKIE_MESSAGE_FILTERS_SOURCE_H_ */