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pow.hh
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26 
27 #ifndef MLN_METAL_MATH_POW_HH
28 # define MLN_METAL_MATH_POW_HH
29 
35 # include <mln/metal/bool.hh>
36 # include <mln/metal/int.hh>
37 
38 
39 # define mlc_pow(X, N) typename mln::metal::math::pow< X, N >::ret
40 # define mlc_pow_int(x, n) mln::metal::math::pow_int< x, n >::value
41 
42 
43 
44 namespace mln
45 {
46 
47  namespace metal
48  {
49 
50  namespace math
51  {
52 
53  // pow_int<x, n>
54 
55  namespace impl
56  {
57 
58  template <int x, int n>
59  struct pow_int_
60  {
61  static const int value = x * pow_int_<x, n-1>::value;
62  };
63 
64  template <int x>
65  struct pow_int_< x, 0 >
66  {
67  static const int value = 1;
68  };
69 
70  template <>
71  struct pow_int_< 0, 0 >;
72 
73 
74  // Entry.
75 
76  template <int x, int n, bool b>
77  struct pow_int_if_ : pow_int_<x, n>
78  {
79  };
80 
81  template <int x, int n>
82  struct pow_int_if_< x, n, false >
83  {
84  };
85 
86  }
87 
88  template <int x, int n>
89  struct pow_int : impl::pow_int_if_< x, n,
90  (n >= 0 && ! (x == 0 && n == 0)) >
91  {
92  };
93 
94 
95  // pow<X, N>
96 
97  template <typename X, typename N>
98  struct pow;
99 
100  template <int x, int n>
101  struct pow< int_<x>, int_<n> >
102  {
104  };
105 
106 
107  } // end of namespace mln::metal::math
108 
109  } // end of namespace mln::metal
110 
111 } // end of namespace mln
112 
113 
114 #endif // ! MLN_METAL_MATH_POW_HH