Signal.hpp

/* ***** BEGIN LICENSE BLOCK *****
 * FW4SPL - Copyright (C) IRCAD, 2009-2017.
 * Distributed under the terms of the GNU Lesser General Public License (LGPL) as
 * published by the Free Software Foundation.
 * ****** END LICENSE BLOCK ****** */

#ifndef __FWCOM_SIGNAL_HPP__
#define __FWCOM_SIGNAL_HPP__

#include "fwCom/SignalBase.hpp"
#include <fwCom/SlotConnection.hpp>

#include <fwCore/mt/types.hpp>

#include <list>
#include <map>
#include <type_traits>
#include <utility>

namespace fwCom
{

struct SlotConnectionBase;
struct SlotBase;

template < typename F >
struct Signal;

template < typename F >
struct SlotRun;

template < typename R, typename ... A >
struct Signal< R(A ...) > : SignalBase
{
    typedef R SignatureType (A ...);

    typedef Signal< SignatureType > SelfType;

    typedef SPTR ( SelfType ) sptr;
    typedef WPTR ( SelfType ) wptr;

    typedef SlotRun< SignatureType > SlotRunType;
    typedef SPTR ( SlotRunType )      SlotSptr;

    typedef std::pair< bool, SlotRunType* > PairType;
    typedef std::list< PairType* > SlotContainerType;

    typedef std::map< WPTR( SlotBase ), WPTR( SlotConnectionBase ),
                      std::owner_less< WPTR( SlotBase ) > > ConnectionMapType;
    static sptr New();

    ~Signal()
    {
        this->disconnectAll();
    }

    Connection connect( SPTR( SlotBase ) slot );

    void disconnect( SPTR( SlotBase ) slot );

    void disconnectAll();

    void emit( A ... a ) const;

    void asyncEmit( A ... a ) const;

    size_t getNumberOfConnections() const
    {
        ::fwCore::mt::ReadLock lock(m_connectionsMutex);
        return m_slots.size();
    }

    Connection getConnection( SPTR( SlotBase ) slot, bool throws = false );

    protected:

        template < typename F >
        friend struct SlotConnection;
        template< typename FROM_F >
        Connection connect( SPTR( SlotBase ) slot );

        SlotContainerType m_slots;

        ConnectionMapType m_connections;

        mutable ::fwCore::mt::ReadWriteMutex m_connectionsMutex;

    private:
        BOOST_STATIC_ASSERT( (std::is_same<void, R>::value) );

};

} // namespace fwCom

#endif /* __FWCOM_SIGNAL_HPP__ */