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Olena  User documentation 2.1
An Image Processing Platform
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decorated_image.cc
1 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
4 //
5 // Olena is free software: you can redistribute it and/or modify it under
6 // the terms of the GNU General Public License as published by the Free
7 // Software Foundation, version 2 of the License.
8 //
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with Olena. If not, see <http://www.gnu.org/licenses/>.
16 //
17 // As a special exception, you may use this file as part of a free
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19 // instantiate templates or use macros or inline functions from this
20 // file, or you compile this file and link it with other files to produce
21 // an executable, this file does not by itself cause the resulting
22 // executable to be covered by the GNU General Public License. This
23 // exception does not however invalidate any other reasons why the
24 // executable file might be covered by the GNU General Public License.
25 
26 #include <mln/core/image/image2d.hh>
27 #include <mln/core/image/imorph/decorated_image.hh>
28 
29 
30 unsigned count_read = 0, count_write = 0;
31 
32 template <typename I>
33 struct counter
34 {
35  void reading(const I&, const mln_psite(I)&) const
36  {
37  ++count_read;
38  }
39  void writing(I&, const mln_psite(I)&, const mln_value(I)&)
40  {
41  ++count_write;
42  }
43 };
44 
45 
46 int main()
47 {
48  using namespace mln;
49 
50  typedef image2d<int> I;
51  I ima(1, 1);
52  point2d p = point2d(0, 0);
53 
54  decorated_image< I, counter<I> > ima_ = decorate(ima, counter<I>());
55  ima_(p) = ima_(p) = 51;
56  mln_assertion(count_read == 1 && count_write == 2);
57 
58  const I& imac = ima;
59  decorated_image< const I, counter<I> > cima_ = decorate(imac, counter<I>());
60  /* Note that the statement
61 
62  cima_(p);
63 
64  alone would *not* trigger a read. It seems the compiler
65  optimizes in our back... */
66  int v = cima_(p);
67  // Avoid a warning on unused value V.
68  v = v;
69  mln_assertion(count_read == 2 && count_write == 2);
70 }