itkMakeUniqueForOverwrite.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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.txt
 *
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 *  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
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 *
 *=========================================================================*/
 
#ifndef itkMakeUniqueForOverwrite_h
#define itkMakeUniqueForOverwrite_h
 
#include <memory>      // For unique_ptr.
#include <type_traits> // For remove_extent_t, false_type, etc.
 
namespace itk
{
 
// Namespace of implementation details (not part of the public ITK interface).
namespace MakeUniqueForOverwriteImplDetail
{
 
// `is_unbounded_array` implementation for C++14/C++17. From C++20, `std::is_unbounded_array` is preferred.
template <typename>
struct is_unbounded_array : std::false_type
{};
 
template <typename T>
struct is_unbounded_array<T[]> : std::true_type
{};
 
} // namespace MakeUniqueForOverwriteImplDetail
 

template <typename TUnboundedArray>
auto
make_unique_for_overwrite(const size_t numberOfElements)
{
  // The template argument must be something like `ElementType[]`, having an empty pair of square brackets.
  static_assert(MakeUniqueForOverwriteImplDetail::is_unbounded_array<TUnboundedArray>::value,
                "The specified template argument must be an unbounded array type!");
  return std::unique_ptr<TUnboundedArray>(new std::remove_extent_t<TUnboundedArray>[numberOfElements]);
}
 
} // namespace itk
 
#endif // itkMakeUniqueForOverwrite_h