<commit_before>/*=========================================================================
 *
 *  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
 *
 *         http://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 itkFFTWCommonExtended_h
#define itkFFTWCommonExtended_h

#if defined(ITK_USE_FFTWF) || defined(ITK_USE_FFTWD)
#  if defined(ITK_USE_CUFFTW)
#    include "cufftw.h"
#  else
#    include "itkFFTWGlobalConfiguration.h"
#    include "fftw3.h"
#  endif
#endif

#include <mutex>

namespace itk
{

namespace fftw
{
/**
 * \class Interface
 * \brief Wrapper for FFTW API
 *
 * \ingroup Ultrasound
 */
template <typename TPixel>
class ComplexToComplexProxy
{
  // empty -- only double and float specializations work
protected:
  ComplexToComplexProxy(){};
  ~ComplexToComplexProxy(){};
};

#if defined(ITK_USE_FFTWF)

template <>
class ComplexToComplexProxy<float>
{
public:
  using PixelType = float;
  using ComplexType = fftwf_complex;
  using PlanType = fftwf_plan;<commit_msg>DOC: Remove lingering Ultrasound dependency<commit_after>/*=========================================================================
 *
 *  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
 *
 *         http://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 itkFFTWCommonExtended_h
#define itkFFTWCommonExtended_h

#if defined(ITK_USE_FFTWF) || defined(ITK_USE_FFTWD)
#  if defined(ITK_USE_CUFFTW)
#    include "cufftw.h"
#  else
#    include "itkFFTWGlobalConfiguration.h"
#    include "fftw3.h"
#  endif
#endif

#include <mutex>

namespace itk
{

namespace fftw
{
/**
 * \class Interface
 * \brief Wrapper for FFTW API
 *
 * \ingroup ITKFFT
 * \ingroup FourierTransform
 */
template <typename TPixel>
class ComplexToComplexProxy
{
  // empty -- only double and float specializations work
protected:
  ComplexToComplexProxy(){};
  ~ComplexToComplexProxy(){};
};

#if defined(ITK_USE_FFTWF)

template <>
class ComplexToComplexProxy<float>
{
public:
  using PixelType = float;
  using ComplexType = fftwf_complex;
  using PlanType = fftwf_plan;
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