#pragma once

#include "caffe2/core/net.h"
#include "caffe2/core/observer.h"
#include "caffe2/core/operator.h"

namespace caffe2 {

// Thin class that attaches the observer to all operators in the net
template <typename TOpObserver, typename TNetObserver>
class OperatorAttachingNetObserver : public ObserverBase<NetBase> {
 public:
  explicit OperatorAttachingNetObserver(
      NetBase* subject_,
      TNetObserver* netObserver)
      : ObserverBase<NetBase>(subject_) {
    const auto& operators = subject_->GetOperators();
    for (auto* op : operators) {
      auto observer = std::make_unique<TOpObserver>(op, netObserver);
      const auto* ob = observer.get();
      op->AttachObserver(std::move(observer));
      operator_observers_.push_back(ob);
    }
  }
  virtual ~OperatorAttachingNetObserver(){};

 protected:
  std::vector<const TOpObserver*> operator_observers_;
};

} // namespace caffe2