SimulatorObserver.h

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#pragma once
 
#ifndef _SIMULATOR_OBSERVER_H_
#define _SIMULATOR_OBSERVER_H_
 
#include <memory>
#include <vector>
 
#include "../../Types.h"
 
namespace Simulators
{

// either derive from this or use the following proxy class (advantage for that:
// no need to derive the Impl class from the interface, just implement 'Update')
class ISimulatorObserver : public std::enable_shared_from_this<ISimulatorObserver>
{
  public:
    virtual ~ISimulatorObserver() = default;

    virtual void Update(const Types::qubits_vector &qubits) = 0;

    std::shared_ptr<ISimulatorObserver> getptr()
    {
        return shared_from_this();
    }
};

template <class Impl> class SimulatorObserverProxy : public ISimulatorObserver
{
  public:
    SimulatorObserverProxy(const std::shared_ptr<Impl> &impl) : impl(impl)
    {
    }

    void Update(const Types::qubits_vector &qubits) override
    {
        if (impl)
            impl->Update(qubits);
    }
 
  private:
    std::shared_ptr<Impl> impl; 
};
 
} // namespace Simulators
 
#endif // _SIMULATOR_OBSERVER_H_