Dune Core Modules (2.4.1)

power.hh
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1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_COMMON_POWER_HH
4#define DUNE_COMMON_POWER_HH
5
10namespace Dune {
11
18 template <int m, int p>
20 {
22 enum { power = (m * StaticPower<m,p-1>::power ) };
23 };
24
26 template <int m>
27 struct StaticPower< m , 0>
28 {
30 enum { power = 1 };
31 };
32
33
34 #ifndef DOXYGEN
35 template <int p, bool odd = p%2>
36 struct PowerImp {};
37#endif
38
45 template <int p>
46 struct Power
47 {
48 template <typename T>
49 static T eval(const T & a)
50 {
51 return PowerImp<p>::eval(a);
52 }
53 };
54
55#ifndef DOXYGEN
56 template <int p>
57 struct PowerImp<p,false>
58 {
59 template <typename T>
60 static T eval(const T & a)
61 {
62 T t = Power<p/2>::eval(a);
63 return t*t;
64 }
65 };
66
67 template <int p>
68 struct PowerImp<p,true>
69 {
70 template <typename T>
71 static T eval(const T & a)
72 {
73 return a*Power<p-1>::eval(a);;
74 }
75 };
76
77 template <>
78 struct PowerImp<1,true>
79 {
80 template <typename T>
81 static T eval(const T & a)
82 {
83 return a;
84 }
85 };
86#endif
87
88}
89
90#endif
Dune namespace.
Definition: alignment.hh:10
Compute power for a run-time mantissa and a compile-time integer exponent.
Definition: power.hh:47
Calculates m^p at compile time.
Definition: power.hh:20
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