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208 lines
9.6 KiB
208 lines
9.6 KiB
/* |
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Copyright 2005-2007 Adobe Systems Incorporated |
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Use, modification and distribution are subject to the Boost Software License, |
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Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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http://www.boost.org/LICENSE_1_0.txt). |
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See http://opensource.adobe.com/gil for most recent version including documentation. |
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*/ |
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/*************************************************************************************************/ |
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#ifndef GIL_PIXEL_ITERATOR_ADAPTOR_H |
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#define GIL_PIXEL_ITERATOR_ADAPTOR_H |
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//////////////////////////////////////////////////////////////////////////////////////// |
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/// \file |
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/// \brief pixel step iterator, pixel image iterator and pixel dereference iterator |
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/// \author Lubomir Bourdev and Hailin Jin \n |
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/// Adobe Systems Incorporated |
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/// \date 2005-2007 \n Last updated on February 16, 2007 |
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/// |
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//////////////////////////////////////////////////////////////////////////////////////// |
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#include <iterator> |
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#include <boost/iterator/iterator_facade.hpp> |
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#include "gil_config.hpp" |
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#include "gil_concept.hpp" |
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#include "pixel_iterator.hpp" |
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namespace boost { namespace gil { |
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/// \defgroup PixelIteratorModelDerefPtr dereference_iterator_adaptor |
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/// \ingroup PixelIteratorModel |
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/// \brief An iterator that invokes a provided function object upon dereference. Models: IteratorAdaptorConcept, PixelIteratorConcept |
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/// \ingroup PixelIteratorModelDerefPtr PixelBasedModel |
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/// \brief An adaptor over an existing iterator that provides for custom filter on dereferencing the object. Models: IteratorAdaptorConcept, PixelIteratorConcept |
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template <typename Iterator, // Models Iterator |
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typename DFn> // Models Returns the result of dereferencing a given iterator of type Iterator |
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class dereference_iterator_adaptor : public iterator_adaptor<dereference_iterator_adaptor<Iterator,DFn>, |
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Iterator, |
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typename DFn::value_type, |
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typename std::iterator_traits<Iterator>::iterator_category, |
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typename DFn::reference, |
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use_default> { |
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DFn _deref_fn; |
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public: |
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typedef iterator_adaptor<dereference_iterator_adaptor<Iterator,DFn>, |
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Iterator, |
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typename DFn::value_type, |
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typename std::iterator_traits<Iterator>::iterator_category, |
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typename DFn::reference, |
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use_default> parent_t; |
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typedef typename DFn::result_type reference; |
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typedef typename std::iterator_traits<Iterator>::difference_type difference_type; |
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typedef DFn dereference_fn; |
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dereference_iterator_adaptor() {} |
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template <typename Iterator1> |
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dereference_iterator_adaptor(const dereference_iterator_adaptor<Iterator1,DFn>& dit) : parent_t(dit.base()), _deref_fn(dit._deref_fn) {} |
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dereference_iterator_adaptor(Iterator it, DFn deref_fn=DFn()) : parent_t(it), _deref_fn(deref_fn) {} |
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template <typename Iterator1, typename DFn1> |
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dereference_iterator_adaptor(const dereference_iterator_adaptor<Iterator1,DFn1>& it) : parent_t(it.base()), _deref_fn(it._deref_fn) {} |
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/// For some reason operator[] provided by iterator_facade returns a custom class that is convertible to reference |
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/// We require our own reference because it is registered in iterator_traits |
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reference operator[](difference_type d) const { return *(*this+d);} |
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// although iterator_adaptor defines these, the default implementation computes distance and compares for zero. |
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// it is often faster to just apply the relation operator to the base |
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bool operator> (const dereference_iterator_adaptor& p) const { return this->base_reference()> p.base_reference(); } |
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bool operator< (const dereference_iterator_adaptor& p) const { return this->base_reference()< p.base_reference(); } |
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bool operator>=(const dereference_iterator_adaptor& p) const { return this->base_reference()>=p.base_reference(); } |
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bool operator<=(const dereference_iterator_adaptor& p) const { return this->base_reference()<=p.base_reference(); } |
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bool operator==(const dereference_iterator_adaptor& p) const { return this->base_reference()==p.base_reference(); } |
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bool operator!=(const dereference_iterator_adaptor& p) const { return this->base_reference()!=p.base_reference(); } |
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Iterator& base() { return this->base_reference(); } |
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const Iterator& base() const { return this->base_reference(); } |
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const DFn& deref_fn() const { return _deref_fn; } |
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private: |
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template <typename Iterator1, typename DFn1> |
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friend class dereference_iterator_adaptor; |
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friend class boost::iterator_core_access; |
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reference dereference() const { return _deref_fn(*(this->base_reference())); } |
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}; |
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template <typename I, typename DFn> |
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struct const_iterator_type<dereference_iterator_adaptor<I,DFn> > { |
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typedef dereference_iterator_adaptor<typename const_iterator_type<I>::type,typename DFn::const_t> type; |
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}; |
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template <typename I, typename DFn> |
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struct iterator_is_mutable<dereference_iterator_adaptor<I,DFn> > : public mpl::bool_<DFn::is_mutable> {}; |
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template <typename I, typename DFn> |
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struct is_iterator_adaptor<dereference_iterator_adaptor<I,DFn> > : public mpl::true_{}; |
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template <typename I, typename DFn> |
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struct iterator_adaptor_get_base<dereference_iterator_adaptor<I,DFn> > { |
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typedef I type; |
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}; |
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template <typename I, typename DFn, typename NewBaseIterator> |
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struct iterator_adaptor_rebind<dereference_iterator_adaptor<I,DFn>,NewBaseIterator> { |
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typedef dereference_iterator_adaptor<NewBaseIterator,DFn> type; |
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}; |
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///////////////////////////// |
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// PixelBasedConcept |
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///////////////////////////// |
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template <typename I, typename DFn> |
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struct color_space_type<dereference_iterator_adaptor<I,DFn> > : public color_space_type<typename DFn::value_type> {}; |
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template <typename I, typename DFn> |
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struct channel_mapping_type<dereference_iterator_adaptor<I,DFn> > : public channel_mapping_type<typename DFn::value_type> {}; |
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template <typename I, typename DFn> |
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struct is_planar<dereference_iterator_adaptor<I,DFn> > : public is_planar<typename DFn::value_type> {}; |
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template <typename I, typename DFn> |
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struct channel_type<dereference_iterator_adaptor<I,DFn> > : public channel_type<typename DFn::value_type> {}; |
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///////////////////////////// |
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// MemoryBasedIteratorConcept |
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///////////////////////////// |
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template <typename Iterator, typename DFn> |
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struct byte_to_memunit<dereference_iterator_adaptor<Iterator,DFn> > : public byte_to_memunit<Iterator> {}; |
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template <typename Iterator, typename DFn> |
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inline typename std::iterator_traits<Iterator>::difference_type |
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memunit_step(const dereference_iterator_adaptor<Iterator,DFn>& p) { |
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return memunit_step(p.base()); |
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} |
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template <typename Iterator, typename DFn> |
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inline typename std::iterator_traits<Iterator>::difference_type |
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memunit_distance(const dereference_iterator_adaptor<Iterator,DFn>& p1, |
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const dereference_iterator_adaptor<Iterator,DFn>& p2) { |
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return memunit_distance(p1.base(),p2.base()); |
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} |
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template <typename Iterator, typename DFn> |
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inline void memunit_advance(dereference_iterator_adaptor<Iterator,DFn>& p, |
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typename std::iterator_traits<Iterator>::difference_type diff) { |
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memunit_advance(p.base(), diff); |
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} |
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template <typename Iterator, typename DFn> |
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inline dereference_iterator_adaptor<Iterator,DFn> |
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memunit_advanced(const dereference_iterator_adaptor<Iterator,DFn>& p, |
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typename std::iterator_traits<Iterator>::difference_type diff) { |
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return dereference_iterator_adaptor<Iterator,DFn>(memunit_advanced(p.base(), diff), p.deref_fn()); |
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} |
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template <typename Iterator, typename DFn> |
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inline |
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typename std::iterator_traits<dereference_iterator_adaptor<Iterator,DFn> >::reference |
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memunit_advanced_ref(const dereference_iterator_adaptor<Iterator,DFn>& p, |
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typename std::iterator_traits<Iterator>::difference_type diff) { |
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return *memunit_advanced(p, diff); |
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} |
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///////////////////////////// |
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// HasDynamicXStepTypeConcept |
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///////////////////////////// |
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template <typename Iterator, typename DFn> |
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struct dynamic_x_step_type<dereference_iterator_adaptor<Iterator,DFn> > { |
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typedef dereference_iterator_adaptor<typename dynamic_x_step_type<Iterator>::type,DFn> type; |
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}; |
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/// \brief Returns the type (and creates an instance) of an iterator that invokes the given dereference adaptor upon dereferencing |
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/// \ingroup PixelIteratorModelDerefPtr |
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template <typename Iterator, typename Deref> |
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struct iterator_add_deref { |
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GIL_CLASS_REQUIRE(Deref, boost::gil, PixelDereferenceAdaptorConcept) |
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typedef dereference_iterator_adaptor<Iterator, Deref> type; |
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static type make(const Iterator& it, const Deref& d) { return type(it,d); } |
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}; |
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/// \ingroup PixelIteratorModelDerefPtr |
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/// \brief For dereference iterator adaptors, compose the new function object after the old one |
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template <typename Iterator, typename PREV_DEREF, typename Deref> |
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struct iterator_add_deref<dereference_iterator_adaptor<Iterator, PREV_DEREF>,Deref> { |
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// GIL_CLASS_REQUIRE(Deref, boost::gil, PixelDereferenceAdaptorConcept) |
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typedef dereference_iterator_adaptor<Iterator, deref_compose<Deref,PREV_DEREF> > type; |
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static type make(const dereference_iterator_adaptor<Iterator, PREV_DEREF>& it, const Deref& d) { |
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return type(it.base(),deref_compose<Deref,PREV_DEREF>(d,it.deref_fn())); |
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} |
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}; |
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} } // namespace boost::gil |
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#endif
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