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Olena  User documentation 2.1
An Image Processing Platform
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proxy.cc
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
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19 // instantiate templates or use macros or inline functions from this
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25 
26 #include <map>
27 #include <mln/value/proxy.hh>
28 
29 
30 template <typename T>
31 struct test
32 {
33  // Interface required by mln::value::proxy.
34 
35  typedef int psite;
36  typedef T value;
37 
38  void write_(const psite& p, const value& v)
39  {
40  // std::cout << "write value " << v << " at " << p << std::endl;
41  data_[p] = v;
42  }
43 
44  value read_(const psite& p) const
45  {
46  // std::cout << "read at " << p << " -> value " << data_[p] << std::endl;
47  return data_[p];
48  }
49 
50  mutable std::map<psite,value> data_;
51 
52  // Some extra interface of an Image.
53 
54  value operator()(const psite& p) const
55  {
56  return read_(p); // Read only!
57  }
58 
59  mln::value::proxy<test> operator()(const psite& p)
60  {
61  mln::value::proxy<test> prx(*this, p);
62  return prx;
63  }
64 };
65 
66 
67 
68 int main()
69 {
70  using namespace mln;
71 
72  test<float> ima;
73 
74  int p = 3;
75 
76  ima(p) = 8.5;
77  ima(p) = 6 * ima(p);
78  mln_assertion(ima(p) == 51);
79 
80  test<int> ima_;
81  ima_(p) = 51;
82  ima_(p) = ima_(p);
83  mln_assertion(ima_(p) == 51);
84 }