SSSSAdapter.h

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#ifndef WIRECELL_SSSSADAPTER
#define WIRECELL_SSSSADAPTER

namespace WireCell {

    /** An adapter which drives the push-pull sink/process/source
     * paradigm to the pure-pull signal/slot execution model.
     */
    template<typename InputType, typename OutputType, class Processor>
    class SigSlotSinkSourceAdapter {
    public:
        typedef boost::signals2::signal<InputType ()> signal_type;
        typedef signal_type::slot_type input_slot_type;

        SigSlotSinkSourceAdapter(Processor& proc) : m_proc(proc) {}

        OutputType operator()() {
            InputType input = m_proc();
            m_proc.sink(input);

            OutputType ot;
            m_proc.source(ot);
            return ot;
        }
        
        void connect(const input_slot_type& s) { m_input.connect(s); }

    private:
        Processor& m_proc;
        signal_type m_input;
    };

}
#endif