gate_operation.h

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/*
Copyright 2025 SQUANDER Contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#pragma once

#include "Gate.h"
#include "density_operation.h"
#include "matrix_real.h"

namespace squander {
namespace density {

class GateOperation : public IDensityOperation {
public:
  GateOperation(Gate *gate, bool owns_gate = true);

  ~GateOperation() override;

  // Disable copy (use clone() instead)
  GateOperation(const GateOperation &) = delete;
  GateOperation &operator=(const GateOperation &) = delete;

  // Move semantics
  GateOperation(GateOperation &&other) noexcept;
  GateOperation &operator=(GateOperation &&other) noexcept;

  void apply_to_density(const double *params, int param_count,
                        DensityMatrix &rho) override;

  int get_parameter_num() const override;
  std::string get_name() const override;
  bool is_unitary() const override { return true; }

  std::unique_ptr<IDensityOperation> clone() const override;

  Gate *get_gate() const { return gate_; }

  int get_target_qbit() const;

  int get_control_qbit() const;

private:
  Gate *gate_;
  bool owns_gate_;
};

} // namespace density
} // namespace squander