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v2v/linear.hh
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25 
26 #ifndef MLN_FUN_V2V_LINEAR_HH
27 # define MLN_FUN_V2V_LINEAR_HH
28 
32 
33 # include <mln/core/concept/function.hh>
34 # include <mln/convert/to.hh>
35 
36 
37 namespace mln
38 {
39 
40  namespace fun
41  {
42 
43  namespace v2v
44  {
45 
54  template <typename V, typename T = V, typename R = T>
55  struct linear : public Function_v2v< linear<V,T,R> >
56  {
57  typedef R result;
58 
59  R operator()(const V& v) const;
60 
61  template <typename U>
62  R operator()(const U& u) const;
63 
64  linear(T a, T b);
65  T a, b;
66  };
67 
68 
69  template <typename V, typename T = V, typename R = T>
70  struct linear_sat : public Function_v2v< linear_sat<V,T,R> >
71  {
72  typedef R result;
73 
74  R operator()(const V& v) const;
75 
76  template <typename U>
77  R operator()(const U& u) const;
78 
79  linear_sat(T a, T b);
80  T a, b;
81  };
82 
83 
84 # ifndef MLN_INCLUDE_ONLY
85 
86 
87  // linear.
88 
89  template <typename V, typename T, typename R>
90  inline
92  : a(a),
93  b(b)
94  {
95  }
96 
97  template <typename V, typename T, typename R>
98  inline
99  R
100  linear<V,T,R>::operator()(const V& v) const
101  {
102  return mln::convert::to<R>(a * static_cast<T>(v) + b);
103  }
104 
105  template <typename V, typename T, typename R>
106  template <typename U>
107  inline
108  R
109  linear<V,T,R>::operator()(const U& u) const
110  {
111  return this->operator()(static_cast<V>(u));
112  }
113 
114 
115  // linear_sat.
116 
117  template <typename V, typename T, typename R>
118  inline
120  : a(a),
121  b(b)
122  {
123  }
124 
125  template <typename V, typename T, typename R>
126  inline
127  R
128  linear_sat<V,T,R>::operator()(const V& v) const
129  {
130  T res = a * static_cast<T>(v) + b;
131  if (res > mln_max(R))
132  res = mln_max(R);
133  else if (res < mln_min(R))
134  res = mln_min(R);
135  return mln::convert::to<R>(res);
136  }
137 
138  template <typename V, typename T, typename R>
139  template <typename U>
140  inline
141  R
142  linear_sat<V,T,R>::operator()(const U& u) const
143  {
144  mlc_converts_to(U, V)::check();
145  return this->operator()(static_cast<V>(u));
146  }
147 
148 
149 # endif // ! MLN_INCLUDE_ONLY
150 
151  } // end of namespace mln::fun::v2v
152 
153  } // end of namespace mln::fun
154 
155 } // end of namespace mln
156 
157 
158 #endif // ! MLN_FUN_V2V_LINEAR_HH