8 #ifndef BOOST_GIL_PIXEL_ITERATOR_ADAPTOR_HPP
9 #define BOOST_GIL_PIXEL_ITERATOR_ADAPTOR_HPP
11 #include <boost/gil/concepts.hpp>
12 #include <boost/gil/pixel_iterator.hpp>
14 #include <boost/iterator/iterator_facade.hpp>
18 namespace boost {
namespace gil {
27 template <
typename Iterator,
31 typename DFn::value_type,
32 typename std::iterator_traits<Iterator>::iterator_category,
33 typename DFn::reference,
37 typedef iterator_adaptor<dereference_iterator_adaptor<Iterator,DFn>,
39 typename DFn::value_type,
40 typename std::iterator_traits<Iterator>::iterator_category,
41 typename DFn::reference,
42 use_default> parent_t;
43 typedef typename DFn::result_type reference;
44 typedef typename std::iterator_traits<Iterator>::difference_type difference_type;
45 typedef DFn dereference_fn;
48 template <
typename Iterator1>
51 template <
typename Iterator1,
typename DFn1>
55 reference
operator[](difference_type d)
const {
return *(*
this+d);}
60 bool operator< (
const dereference_iterator_adaptor& p)
const {
return this->base_reference()< p.base_reference(); }
61 bool operator>=(
const dereference_iterator_adaptor& p)
const {
return this->base_reference()>=p.base_reference(); }
62 bool operator<=(
const dereference_iterator_adaptor& p)
const {
return this->base_reference()<=p.base_reference(); }
63 bool operator==(
const dereference_iterator_adaptor& p)
const {
return this->base_reference()==p.base_reference(); }
64 bool operator!=(
const dereference_iterator_adaptor& p)
const {
return this->base_reference()!=p.base_reference(); }
66 Iterator& base() {
return this->base_reference(); }
67 const Iterator& base()
const {
return this->base_reference(); }
68 const DFn& deref_fn()
const {
return _deref_fn; }
70 template <
typename Iterator1,
typename DFn1>
71 friend class dereference_iterator_adaptor;
72 friend class boost::iterator_core_access;
74 reference dereference()
const {
return _deref_fn(*(this->base_reference())); }
77 template <
typename I,
typename DFn>
78 struct const_iterator_type<dereference_iterator_adaptor<I,DFn> > {
79 typedef dereference_iterator_adaptor<typename const_iterator_type<I>::type,
typename DFn::const_t> type;
82 template <
typename I,
typename DFn>
83 struct iterator_is_mutable<dereference_iterator_adaptor<I,DFn> > :
public mpl::bool_<DFn::is_mutable> {};
86 template <
typename I,
typename DFn>
87 struct is_iterator_adaptor<dereference_iterator_adaptor<I,DFn> > :
public mpl::true_{};
89 template <
typename I,
typename DFn>
90 struct iterator_adaptor_get_base<dereference_iterator_adaptor<I,DFn> > {
94 template <
typename I,
typename DFn,
typename NewBaseIterator>
95 struct iterator_adaptor_rebind<dereference_iterator_adaptor<I,DFn>,NewBaseIterator> {
96 typedef dereference_iterator_adaptor<NewBaseIterator,DFn> type;
103 template <
typename I,
typename DFn>
104 struct color_space_type<dereference_iterator_adaptor<I,DFn> > :
public color_space_type<typename DFn::value_type> {};
106 template <
typename I,
typename DFn>
107 struct channel_mapping_type<dereference_iterator_adaptor<I,DFn> > :
public channel_mapping_type<typename DFn::value_type> {};
109 template <
typename I,
typename DFn>
110 struct is_planar<dereference_iterator_adaptor<I,DFn> > :
public is_planar<typename DFn::value_type> {};
112 template <
typename I,
typename DFn>
113 struct channel_type<dereference_iterator_adaptor<I,DFn> > :
public channel_type<typename DFn::value_type> {};
120 template <
typename Iterator,
typename DFn>
121 struct byte_to_memunit<dereference_iterator_adaptor<Iterator,DFn> > :
public byte_to_memunit<Iterator> {};
123 template <
typename Iterator,
typename DFn>
124 inline typename std::iterator_traits<Iterator>::difference_type
125 memunit_step(
const dereference_iterator_adaptor<Iterator,DFn>& p) {
126 return memunit_step(p.base());
129 template <
typename Iterator,
typename DFn>
130 inline typename std::iterator_traits<Iterator>::difference_type
131 memunit_distance(
const dereference_iterator_adaptor<Iterator,DFn>& p1,
132 const dereference_iterator_adaptor<Iterator,DFn>& p2) {
133 return memunit_distance(p1.base(),p2.base());
136 template <
typename Iterator,
typename DFn>
137 inline void memunit_advance(dereference_iterator_adaptor<Iterator,DFn>& p,
138 typename std::iterator_traits<Iterator>::difference_type diff) {
139 memunit_advance(p.base(), diff);
142 template <
typename Iterator,
typename DFn>
143 inline dereference_iterator_adaptor<Iterator,DFn>
144 memunit_advanced(
const dereference_iterator_adaptor<Iterator,DFn>& p,
145 typename std::iterator_traits<Iterator>::difference_type diff) {
146 return dereference_iterator_adaptor<Iterator,DFn>(memunit_advanced(p.base(), diff), p.deref_fn());
150 template <
typename Iterator,
typename DFn>
152 typename std::iterator_traits<dereference_iterator_adaptor<Iterator,DFn> >::reference
153 memunit_advanced_ref(
const dereference_iterator_adaptor<Iterator,DFn>& p,
154 typename std::iterator_traits<Iterator>::difference_type diff) {
155 return *memunit_advanced(p, diff);
162 template <
typename Iterator,
typename DFn>
163 struct dynamic_x_step_type<dereference_iterator_adaptor<Iterator,DFn> > {
164 typedef dereference_iterator_adaptor<typename dynamic_x_step_type<Iterator>::type,DFn> type;
169 template <
typename Iterator,
typename Deref>
170 struct iterator_add_deref {
171 GIL_CLASS_REQUIRE(Deref, boost::gil, PixelDereferenceAdaptorConcept)
173 typedef dereference_iterator_adaptor<Iterator, Deref> type;
175 static type make(const Iterator& it, const Deref& d) {
return type(it,d); }
180 template <
typename Iterator,
typename PREV_DEREF,
typename Deref>
Returns the type (and creates an instance) of an iterator that invokes the given dereference adaptor ...
Definition: locator.hpp:25
An adaptor over an existing iterator that provides for custom filter on dereferencing the object...
Definition: pixel_iterator_adaptor.hpp:29
reference operator[](difference_type d) const
Definition: pixel_iterator_adaptor.hpp:55
Composes two dereference function objects. Similar to std::unary_compose but needs to pull some typed...
Definition: utilities.hpp:105