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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
*
* 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 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
/** `make_unique_for_overwrite` implementation for C++14/C++17, specifically for dynamically sized ("unbounded")
* arrays. From C++20, `std::make_unique_for_overwrite` would be preferred, at least if the C++20 feature macro
* `__cpp_lib_smart_ptr_for_overwrite` is defined.
*
* Example (mind the square brackets):
\code
using ElementType = int;
size_t numberOfElements{ 42 };
// Create a buffer that may be used to store the specified number of elements.
auto buffer = make_unique_for_overwrite<ElementType[]>(numberOfElements);
\endcode
*
*/
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
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