source: src/Fragmentation/Summation/ZeroInstanceInitializer.hpp@ 0ee9cb3

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Last change on this file since 0ee9cb3 was da098d2, checked in by Frederik Heber <heber@…>, 9 years ago

..Summators and AllLevel..Summators pass through ZeroInstance, added ZeroInstanceInitializer.

  • ZeroInstanceInitializer fills the boost::fusion::map with default values.
  • this is handed to AllLevel..Summators that use ..Summators::setZeroInstance() if the present entry in the fusion map is unequal to ZeroInstance<T>.
  • ..SumUpPerLevel instantiate a default set of zero instances and pass it on for the moment.
  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 * ZeroInstanceInitializer.hpp
3 *
4 * Created on: Jun 12, 2016
5 * Author: heber
6 */
7
8
9#ifndef ZEROINSTANCEINITIALIZER_HPP_
10#define ZEROINSTANCEINITIALIZER_HPP_
11
12// include config.h
13#ifdef HAVE_CONFIG_H
14#include <config.h>
15#endif
16
17#include <map>
18#include <vector>
19
20#include "Fragmentation/Summation/ZeroInstance.hpp"
21
22/** This struct initializes zero instances for Summation and OrthogonalSummation
23 * to use as default set of base values.
24 *
25 * Template MapType gives us a boost::fusion::map of types that we iterate over to
26 * fill.
27 */
28template <typename MapType>
29struct ZeroInstanceInitializer
30{
31 /** Constructor of class ZeroInstanceInitializer.
32 *
33 */
34 ZeroInstanceInitializer(
35 MapType &_ZeroInstances) :
36 ZeroInstances(_ZeroInstances)
37 {}
38
39 /** Operator that fills the specific type \a MapValue to \a MapKey in its given
40 * maps and vectors with false and the default ZeroInstance<T>.
41 *
42 */
43 template <typename MapKey>
44 void operator()(MapKey &) {
45 // We retrieve the type of the member variable from the boost::fusion::map.
46 typedef typename boost::fusion::result_of::value_at_key<MapType, MapKey>::type MapValue;
47
48 // fill vector with default value
49 const MapValue value = ZeroInstance<MapValue>();
50 boost::fusion::at_key<MapKey>(ZeroInstances) = value;
51 }
52
53 //!> vector of all zero instance, to be filled by operator()
54 MapType &ZeroInstances;
55};
56
57
58#endif /* ZEROINSTANCEINITIALIZER_HPP_ */
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