density_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 <memory>
#include <string>

namespace squander {
namespace density {

// Forward declaration
class DensityMatrix;

class IDensityOperation {
public:
  virtual ~IDensityOperation() = default;

  virtual void apply_to_density(const double *params, int param_count,
                                DensityMatrix &rho) = 0;

  virtual int get_parameter_num() const = 0;

  virtual std::string get_name() const = 0;

  virtual bool is_unitary() const = 0;

  virtual std::unique_ptr<IDensityOperation> clone() const = 0;
};

} // namespace density
} // namespace squander