src/iceberg/util/checked_cast.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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

/// \file iceberg/util/checked_cast.h
/// \brief Checked cast functions for dynamic_cast and static_cast.
/// Adapted from Apache Arrow
/// https://github.com/apache/arrow/blob/main/cpp/src/arrow/util/checked_cast.h

#include <memory>
#include <type_traits>
#include <utility>

namespace iceberg::internal {

template <typename OutputType, typename InputType>
inline OutputType checked_cast(InputType&& value) {
  static_assert(
      std::is_class_v<std::remove_pointer_t<std::remove_reference_t<InputType>>>,
      "checked_cast input type must be a class");
  static_assert(
      std::is_class_v<std::remove_pointer_t<std::remove_reference_t<OutputType>>>,
      "checked_cast output type must be a class");
#ifdef NDEBUG
  return static_cast<OutputType>(value);
#else
  return dynamic_cast<OutputType>(value);
#endif
}

template <class T, class U>
std::shared_ptr<T> checked_pointer_cast(std::shared_ptr<U> r) noexcept {
#ifdef NDEBUG
  return std::static_pointer_cast<T>(std::move(r));
#else
  return std::dynamic_pointer_cast<T>(std::move(r));
#endif
}

template <class T, class U>
std::unique_ptr<T> checked_pointer_cast(std::unique_ptr<U> r) noexcept {
#ifdef NDEBUG
  return std::unique_ptr<T>(static_cast<T*>(r.release()));
#else
  return std::unique_ptr<T>(dynamic_cast<T*>(r.release()));
#endif
}

}  // namespace iceberg::internal