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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 itkNeighborhoodAllocator_h
#define itkNeighborhoodAllocator_h
#include "itkMakeUniqueForOverwrite.h"
#include <algorithm>
#include <iostream>
#include <memory>
#include "itkMacro.h"
namespace itk
{
/** \class NeighborhoodAllocator
* \brief A memory allocator for use as the default allocator type in
* Neighborhood.
*
* This is a memory allocator for use as the default allocator type in
* Neighborhood. The API is designed to mimic that of vnl_vector so that
* vnl_vector can also be used as an allocator for Neighborhood.
*
* The decision to create this allocator with the vnl_vector api (versus
* using an STL allocator and wrapping the vnl_vector API) was made because
* the STL allocator API is not guaranteed stable at this time.
*
* \ingroup Operators
* \ingroup ITKCommon
*/
template <typename TPixel>
class NeighborhoodAllocator
{
public:
/** Standard class type aliases. */
using Self = NeighborhoodAllocator;
/** Iterator support. Note that the naming of the type alias is on purpose.
* itk::Neighborhood makes reference to the allocator, which because it may
* be vnl or other type, uses the lower case/underscore forms iterator and
* const_iterator. */
using iterator = TPixel *;
using const_iterator = const TPixel *;
/** Default constructor */
NeighborhoodAllocator() = default;
/** Defaulted destructor */
~NeighborhoodAllocator() = default;
/** Allocates memory. */
void
Allocate(unsigned int n)
{
m_Data = make_unique_for_overwrite<TPixel[]>(n);
m_ElementCount = n;
}
/** Deallocates memory. */
void
Deallocate()
{
m_Data.reset();
m_ElementCount = 0;
}
/** Copy constructor. */
NeighborhoodAllocator(const Self & other)
: m_ElementCount(other.m_ElementCount)
, m_Data(make_unique_for_overwrite<TPixel[]>(other.m_ElementCount))
{
std::copy_n(other.m_Data.get(), m_ElementCount, m_Data.get());
}
/** Move-constructor. */
NeighborhoodAllocator(Self && other) noexcept
: m_ElementCount{ other.m_ElementCount }
, m_Data{ std::move(other.m_Data) }
{
other.m_ElementCount = 0;
}
/** Assignment operator. */
Self &
operator=(const Self & other)
{
if (this != &other)
{
this->set_size(other.m_ElementCount);
std::copy_n(other.m_Data.get(), m_ElementCount, m_Data.get());
}
return *this;
}
/** Move-assignment. */
Self &
operator=(Self && other) noexcept
{
if (this != &other)
{
m_ElementCount = other.m_ElementCount;
m_Data = std::move(other.m_Data);
other.m_ElementCount = 0;
}
return *this;
}
/** STL-style iterator support for the memory buffer. */
iterator
begin()
{
return m_Data.get();
}
const_iterator
begin() const
{
return m_Data.get();
}
iterator
end()
{
return (m_Data.get() + m_ElementCount);
}
const_iterator
end() const
{
return (m_Data.get() + m_ElementCount);
}
unsigned int
size() const
{
return m_ElementCount;
}
/** Data access methods */
const TPixel & operator[](unsigned int i) const { return m_Data[i]; }
TPixel & operator[](unsigned int i) { return m_Data[i]; }
/** Allocates a buffer of size n */
void
set_size(unsigned int n)
{
if (n != m_ElementCount)
{
*this = NeighborhoodAllocator();
m_Data = make_unique_for_overwrite<TPixel[]>(n);
m_ElementCount = n;
}
}
TPixel *
data() noexcept
{
return m_Data.get();
}
const TPixel *
data() const noexcept
{
return m_Data.get();
}
private:
unsigned int m_ElementCount{ 0 };
std::unique_ptr<TPixel[]> m_Data;
};
template <typename TPixel>
inline std::ostream &
operator<<(std::ostream & o, const NeighborhoodAllocator<TPixel> & a)
{
o << "NeighborhoodAllocator { this = " << &a << ", begin = " << static_cast<const void *>(a.begin())
<< ", size=" << a.size() << " }";
return o;
}
// Equality operator.
template <typename TPixel>
inline bool
operator==(const NeighborhoodAllocator<TPixel> & lhs, const NeighborhoodAllocator<TPixel> & rhs)
{
const unsigned int size = lhs.size();
return (size == rhs.size()) && ((size == 0) || std::equal(lhs.begin(), lhs.end(), rhs.begin()));
}
// Inequality operator.
template <typename TPixel>
inline bool
operator!=(const NeighborhoodAllocator<TPixel> & lhs, const NeighborhoodAllocator<TPixel> & rhs)
{
return !(lhs == rhs);
}
} // end namespace itk
#endif
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