Composite.h

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#pragma once
#ifdef INCLUDED_BY_FACTORY
#include "../Fusion/FusionSimulator.h"
#include "ImmediateComposite.h"
 
namespace Simulators::Private
{
class CompositeSimulator : public FusionSimulator<FusionState>
{
  public:
    explicit CompositeSimulator(SimulatorType type = SimulatorType::kQCSim)
        : FusionSimulator(std::make_shared<ImmediateCompositeSimulator>(type)), childType_(type)
    {
    }
 
    unsigned GetGateFusionMaxQubits() const override
    {
        return childType_ == SimulatorType::kQCSim ? 3 : 0;
    }
 
    std::unique_ptr<ISimulator> Clone() override
    {
        auto copy = std::make_unique<CompositeSimulator>(childType_);
        CloneInto(*copy);
        return copy;
    }
 
    std::unique_ptr<ISimulator> CloneForExecution(uint64_t seed) override
    {
        auto copy = std::make_unique<CompositeSimulator>(childType_);
        CloneInto(*copy, &seed);
        return copy;
    }
 
  protected:
    // The composite keeps its separate cloned snapshot when rebuilding children.
    bool InitializationPreservesSnapshots() const override
    {
        return true;
    }
 
  private:
    SimulatorType childType_;
};
} // namespace Simulators::Private
#endif