port.hh

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#ifndef __SIM_PORT_HH__
#define __SIM_PORT_HH__

#include <string>

#include "base/types.hh"

class Port
{

  private:

    const std::string portName;

  protected:

    const PortID id;

    Port *_peer;


    bool _connected;

    Port(const std::string& _name, PortID _id);

  public:

    virtual ~Port();

    Port &getPeer() { return *_peer; }

    const std::string name() const { return portName; }

    PortID getId() const { return id; }

    virtual void
    bind(Port &peer)
    {
        _peer = &peer;
        _connected = true;
    }

    virtual void
    unbind()
    {
        _peer = nullptr;
        _connected = false;
    }

    bool isConnected() const { return _connected; }

    void
    takeOverFrom(Port *old)
    {
        assert(old);
        assert(old->isConnected());
        assert(!isConnected());
        Port &peer = old->getPeer();
        assert(peer.isConnected());

        // Disconnect the original binding.
        old->unbind();
        peer.unbind();

        // Connect the new binding.
        peer.bind(*this);
        bind(peer);
    }
};

static inline std::ostream &
operator << (std::ostream &os, const Port &port)
{
    os << port.name();
    return os;
}

#endif //__SIM_PORT_HH__