SignalResponseType.h

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#ifndef art_Framework_Services_Registry_detail_SignalResponseType_h
#define art_Framework_Services_Registry_detail_SignalResponseType_h

// Definition for ActivityRegistry and friends of the two available
// signal response types and a suitable overload set for a function to
// connect a slot to a signal in the desired way.

#include <type_traits>

namespace art {
  namespace detail {
    enum class SignalResponseType { FIFO, LIFO };

    template <SignalResponseType STYPE, typename SIGNAL, typename FUNC>
    std::enable_if_t<STYPE == SignalResponseType::FIFO>
    connect_to_signal(SIGNAL& s, FUNC f)
    {
      s.emplace_back(f);
    }

    template <SignalResponseType STYPE, typename SIGNAL, typename FUNC>
    std::enable_if_t<STYPE == SignalResponseType::LIFO>
    connect_to_signal(SIGNAL& s, FUNC f)
    {
      s.emplace_front(f);
    }
  }
}

#endif /* art_Framework_Services_Registry_detail_SignalResponseType_h */

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