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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 itkMakeFilled_h
#define itkMakeFilled_h
namespace itk
{
/** Yields a container of the specified type, filled by the specified value, assigned to each of its elements.
* Only intended for container types of a compile-time fixed size, including instances of FixedArray (and derived
* classes), Index, Offset, Size, and std::array. Moreover, their size (number of elements) should be greater than zero.
*/
template <typename TContainer>
constexpr TContainer
MakeFilled(typename TContainer::const_reference value)
{
// Note: The seemingly redundant {} initialization is required for C++14 and C++17, in order to declare MakeFilled
// constexpr. (C++20 does allow uninitialized variables in a constexpr function.)
TContainer container{};
static_assert(container.size() > 0, "MakeFilled requires TContainer with constant non-zero size!");
// Note that `std::fill` and `std::fill_n` are not `constexpr` until C++20.
for (auto & element : container)
{
element = value;
}
return container;
}
} // namespace itk
#endif // itkMakeFilled_h
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