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_