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Olena  User documentation 2.1
An Image Processing Platform
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positive.cc
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26 
28 
29 #include <mln/core/image/image2d.hh>
30 #include <mln/test/positive.hh>
31 
32 #include <mln/data/fill.hh>
33 #include <mln/debug/iota.hh>
34 
35 int main()
36 {
37  using namespace mln;
38  typedef image2d<int> I;
39 
40  /* Null values.
41 
42  Note that mln::test::positive actually checks whether all the
43  values of an image are non-negative, thus considering 0 as a
44  valid value (which is usually not the case of the term
45  ``positive'' in English). */
46  I zeros(3,3);
47  data::fill(zeros, 0);
48  mln_assertion(test::positive(zeros));
49 
50  /* Positive (non-null) natural numbers. */
51  I naturals(3,3);
52  debug::iota(naturals);
53  mln_assertion(test::positive(naturals));
54 
55  /* Negative (non-null) numbers. */
56  I negatives(3,3);
57  data::fill(negatives, -42);
58  mln_assertion(!test::positive(negatives));
59 }