circuit.h

// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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
//
//     https://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.

#ifndef CIRCUIT_H_
#define CIRCUIT_H_

#include <vector>

namespace qsim {

/**
 * A collection of gates. This object is consumed by `QSim[h]Runner.Run()`.
 */
template <typename Gate>
struct Circuit {
  unsigned num_qubits;
  /**
   * The set of gates to be run. Gate times should be ordered.
   */
  std::vector<Gate> gates;
};

namespace detail {

/**
 * An adapter for vectors of gates.
 */
template <typename Circuit>
struct Gates;

template <typename Gate>
struct Gates<qsim::Circuit<Gate>> {
  static const std::vector<Gate>& get(const qsim::Circuit<Gate>& circuit) {
    return circuit.gates;
  }

  static const Gate& gate(const Gate& g) {
    return g;
  }
};

template <typename Gate>
struct Gates<std::vector<Gate>> {
  static const std::vector<Gate>& get(const std::vector<Gate>& gates) {
    return gates;
  }

  static const Gate& gate(const Gate& g) {
    return g;
  }
};

template <typename Gate>
struct Gates<std::vector<Gate*>> {
  static const std::vector<Gate*>& get(const std::vector<Gate*>& gates) {
    return gates;
  }

  static const Gate& gate(const Gate* g) {
    return *g;
  }
};

}  // namespace detail

}  // namespace qsim

#endif  // CIRCUIT_H_