adder.h

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#pragma once

#include <cstdint>
#include <memory>

#include "drake/systems/framework/continuous_system_interface.h"
#include "drake/systems/framework/cache.h"
#include "drake/systems/framework/system_output.h"
#include "drake/systems/framework/vector_interface.h"

namespace drake {
namespace systems {

template <typename T>
class Adder : public SystemInterface<T> {
 public:
  Adder(int num_inputs, int length);

  std::unique_ptr<Context<T>> CreateDefaultContext() const override;

  std::unique_ptr<SystemOutput<T>> AllocateOutput() const override;

  void EvalOutput(const Context<T>& context,
                  SystemOutput<T>* output) const override;

  std::string get_name() const override { return "adder"; }

 private:
  const int num_inputs_;
  const int length_;
};

}  // namespace systems
}  // namespace drake