SubDetHitStatistics.h File Reference

#include "AthenaKernel/CLASS_DEF.h"
#include <cstring>

Include dependency graph for SubDetHitStatistics.h:

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Classes
class	SubDetHitStatistics
class	SubDetHitStatistics::OverflowControlledRef
	A simple class to retrofit overflow protection into the existing code. More...

Functions
template<class Ostream >
Ostream &	operator<< (Ostream &os, const SubDetHitStatistics &m)

Detailed Description

A struture to keep per-subdetector numbers of hits for truth matching. The numbers are typically small, so only one byte (unsigned char) is per subdetector is allocated. However it's been observed that a low-energy track looping in the TRT may sometimes produce more than 255 hits, causing an integer overflow and producing "impossible" Tanimoto similarity measure > 1. This is now addressed by the OverflowControlledRef helper class that provides a protection layer for the hit count storage.

Counts of up to OVERFLOW_VALUE-1 hits can be stored unambiguously. If a SubDetHitStatistics counter is set to OVERFLOW_VALUE, that means there were OVERFLOW_VALUE or more hits.

Author

Andrei Gaponenko, 2006-2009

Definition in file SubDetHitStatistics.h.

Function Documentation

operator<<()

template<class Ostream >

Ostream& operator<<	(	Ostream &	os,
		const SubDetHitStatistics &	m
	)

Definition at line 97 of file SubDetHitStatistics.h.

                                                                                       {
  os<<"SubDetStat(";
  for(unsigned i=0; i<SubDetHitStatistics::NUM_SUBDETECTORS; i++) {
    os<<unsigned(m[SubDetHitStatistics::SubDetType(i)]);
    if(i!=SubDetHitStatistics::NUM_SUBDETECTORS) os<<",";
  }
  return os<<")";
}