Program Listing for File GateIndices.hpp

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// Copyright 2018-2023 Xanadu Quantum Technologies Inc.

// 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 <cstdlib>
#include <set>
#include <vector>

#include "Util.hpp"

namespace Pennylane::LightningQubit::Gates {
auto getIndicesAfterExclusion(const std::vector<std::size_t> &indicesToExclude,
                              std::size_t num_qubits)
    -> std::vector<std::size_t>;

auto generateBitPatterns(const std::vector<std::size_t> &qubitIndices,
                         std::size_t num_qubits) -> std::vector<std::size_t>;

struct GateIndices {
    const std::vector<std::size_t> internal;
    const std::vector<std::size_t>
        external;
    GateIndices(const std::vector<std::size_t> &wires, std::size_t num_qubits)
        : internal{generateBitPatterns(wires, num_qubits)},
          external{generateBitPatterns(
              getIndicesAfterExclusion(wires, num_qubits), num_qubits)} {}
};
} // namespace Pennylane::LightningQubit::Gates

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