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math/sign.hh
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26 
27 #ifndef MLN_MATH_SIGN_HH
28 # define MLN_MATH_SIGN_HH
29 
36 namespace mln
37 {
38 
39  namespace math
40  {
41 
42  enum sign_t
43  {
44  negative = -1,
45  null = 0,
46  positive = +1
47  };
48 
49 
53  template <typename T>
54  sign_t sign(const T& v);
55 
56 
57 # ifndef MLN_INCLUDE_ONLY
58 
59  template <typename T>
60  inline
61  sign_t sign(const T& v)
62  {
63  return v > 0 ? positive : (v < 0 ? negative : null);
64  }
65 
66 # endif // ! MLN_INCLUDE_ONLY
67 
68  } // end of namespace mln::math
69 
70 } // end of namespace mln
71 
72 
73 #endif // ! MLN_MATH_SIGN_HH