source: src/Fragmentation/Summation/ZeroInstance.hpp@ 562b0a

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Last change on this file since 562b0a was 58952a, checked in by Frederik Heber <heber@…>, 12 years ago

SetValue treats ZeroInstance as value special.

  • ZeroInstance in value indicates omit contribution in summation.
  • Property mode set to 100644
File size: 854 bytes
RevLine 
[beb16e]1/*
2 * ZeroInstance.hpp
3 *
4 * Created on: Aug 10, 2012
5 * Author: heber
6 */
7
8#ifndef ZEROINSTANCE_HPP_
9#define ZEROINSTANCE_HPP_
10
11
12// include config.h
13#ifdef HAVE_CONFIG_H
14#include <config.h>
15#endif
16
17/** This functions returns an instance equal to zero.
[58952a]18 *
19 * This serves two functions: One the one hand we need a zero value to intialize
20 * the (Orthogonal)Summation. On the other hand, ZeroInstance<T> also marks a
21 * special (Set)Value of a subset that should not contribute, i.e. whose
22 * contribution is set to zero.
[beb16e]23 *
24 * @return instance initialized to zero
25 */
26template <typename T> T ZeroInstance()
27{
28 return NULL;
29}
30
31template<> inline double ZeroInstance<double>() { return 0.; }
32template<> inline int ZeroInstance<int>() { return 0; }
33template<> inline size_t ZeroInstance<size_t>() { return (size_t)0; }
34
35
36#endif /* ZEROINSTANCE_HPP_ */
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