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maj_h.hh
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25 
26 #ifndef MLN_ACCU_MAJ_H_HH
27 # define MLN_ACCU_MAJ_H_HH
28 
32 
33 
34 # include <mln/core/concept/meta_accumulator.hh>
35 # include <mln/accu/internal/base.hh>
36 # include <mln/trait/value_.hh>
37 # include <mln/util/pix.hh>
38 # include <mln/accu/histo.hh>
39 # include <vector>
40 
41 
42 namespace mln
43 {
44 
45  namespace accu
46  {
47 
48 
50 
56  template <typename T>
57  struct maj_h : public mln::accu::internal::base< const T& , maj_h<T> >
58  {
59  typedef T argument;
60 
61  maj_h();
62 
65  void init();
66  void take(const argument& t);
67  void untake(const argument& t);
68  void take(const maj_h<T>& other);
70 
72  const T& to_result() const;
73 
74  //operator T () const;
75 
78  bool is_valid() const;
79 
80  void update_() const;
81 
82  mutable bool valid_;
83 
84  const accu::histo<T>& histo() const;
85 
86  protected:
87 
88  mutable argument t_;
89  mutable accu::histo<T> h_;
90  };
91 
92 
93  template <typename I> struct maj_h< util::pix<I> >;
94 
95 
96  namespace meta
97  {
98 
100 
101  struct maj_h : public Meta_Accumulator< maj_h >
102  {
103  template <typename T>
104  struct with
105  {
107  };
108  };
109 
110  } // end of namespace mln::accu::meta
111 
112 
113 
114 # ifndef MLN_INCLUDE_ONLY
115 
116  template <typename T>
117  inline
119  {
120  init();
121  valid_ = true;
122  //FIXME: Not generic
123  t_ = literal::zero;
124  }
125 
126  template <typename T>
127  inline
128  void
130  {
131  h_.init();
132  }
133 
134  template <typename T>
135  inline
136  void
137  maj_h<T>::take(const argument& t)
138  {
139  h_.take(t);
140 
141  //update return value
142  if (h_(t) > h_(t_))
143  t_ = t;
144  }
145 
146  template <typename T>
147  inline
148  void
149  maj_h<T>::untake(const argument& t)
150  {
151  h_.untake(t);
152 
153  if (valid_)
154  valid_ = false;
155  }
156 
157  template <typename T>
158  inline
159  void
160  maj_h<T>::take(const maj_h<T>& other)
161  {
162  h_.take(other.h_);
163 
164  if (valid_)
165  valid_ = false;
166  }
167 
168  template <typename T>
169  inline
170  void
171  maj_h<T>::update_() const
172  {
173  const std::vector<unsigned>& v = h_.vect();
174 
175  for(unsigned i = 0; i != v.size(); i++)
176  {
177  // if nb referents of occurrence i > nb referents of t_
178  if (v[i] > h_(t_))
179  t_ = h_.vset()[i]; // t_ <- current
180  }
181  valid_ = true;
182  }
183 
184  template <typename T>
185  inline
186  const T&
187  maj_h<T>::to_result() const
188  {
189  if (not valid_)
190  update_();
191  return t_;
192  }
193 
194  template <typename T>
195  inline
196  bool
197  maj_h<T>::is_valid() const
198  {
199  return true;
200  }
201 
202  template <typename V>
203  inline
204  const accu::histo<V>&
205  maj_h<V>::histo() const
206  {
207  return h_;
208  }
209 
210 # endif // ! MLN_INCLUDE_ONLY
211 
212  } // end of namespace mln::accu
213 
214 } // end of namespace mln
215 
216 
217 #endif // ! MLN_ACCU_MAJ_H_HH