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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 itkBitCast_h
#define itkBitCast_h
#include <cstring> // For memcpy.
#include <type_traits> // For is_trivially_copyable and remove_const_t.
namespace itk
{
/** Rudimentary `bit_cast` implementation for C++14/C++17. From C++20, `std::bit_cast` would be preferred, at least if
* the C++20 feature macro `__cpp_lib_bit_cast` is defined.
*/
template <typename TDestination, class TSource>
TDestination
bit_cast(const TSource & source)
{
static_assert(sizeof(TDestination) == sizeof(TSource),
"The destination type should have the same size as the source type.");
static_assert(std::is_trivially_copyable_v<TDestination>, "The destination type should be trivially copyable");
static_assert(std::is_trivially_copyable_v<TSource>, "The source type should be trivially copyable.");
std::remove_const_t<TDestination> result;
std::memcpy(&result, &source, sizeof(TSource));
return result;
}
} // namespace itk
#endif // itkBitCast_h
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