source: src/Potentials/helpers.hpp@ 610c11

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Last change on this file since 610c11 was 6bb72a, checked in by Frederik Heber <heber@…>, 13 years ago

Added general interface EmpiricalPotential and a first potential, the harmonic pair potential.

  • EmpiriCalPotential is to be derived from any potential function, setting the interface of how these are called.
  • PairPotential_Harmonic implements a simple harmonic potential.
  • EmpiricalPotential has subclass argument_t for the argument consisting of distance and index pair as we need to store the indices of the given distance.
  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 * helpers.hpp
3 *
4 * Created on: Sep 26, 2012
5 * Author: heber
6 */
7
8#ifndef POTENTIALS_HELPERS_HPP_
9#define POTENTIALS_HELPERS_HPP_
10
11
12// include config.h
13#ifdef HAVE_CONFIG_H
14#include <config.h>
15#endif
16
17namespace Helpers
18{
19
20 /** Integer-optimized version for power of n.
21 *
22 * This is taken from Julian Iseringhausen's VMG project which is under
23 * GPL.
24 *
25 * @param base base
26 * @param power power to take \a base to
27 * @return \a base to the power of \a power
28 */
29 inline int intpow(int base, unsigned int power)
30 {
31 int result = 1;
32 while (power != 0) {
33 if (power & 1)
34 result *= base;
35 base *= base;
36 power >>= 1;
37 }
38 return result;
39 }
40
41 /** Double-optimized version for power of n.
42 *
43 * This is taken from Julian Iseringhausen's VMG project which is under
44 * GPL.
45 *
46 * @param base base
47 * @param power power to take \a base to
48 * @return \a base to the power of \a power
49 */
50 inline double pow(double base, unsigned int power)
51 {
52 double result = 1.0;
53 while (power != 0) {
54 if (power & 1)
55 result *= base;
56 base *= base;
57 power >>= 1;
58 }
59 return result;
60 }
61
62}; /* namespace Helpers */
63
64
65#endif /* POTENTIALS_HELPERS_HPP_ */
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