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CommonUtils.hh
1 //----------------------------------------------------------------------
2 // This file distributed with FastJet has been obtained from SpartyJet
3 // v2.20.0 by Pierre-Antoine Delsart, Kurtis L. Geerlings, Joey
4 // Huston, Brian T. Martin and Chris Vermilion
5 // For details, see http://www.pa.msu.edu/~huston/SpartyJet/
6 // http://projects.hepforge.org/spartyjet/
7 //
8 // Changes from the original file are listed below.
9 //----------------------------------------------------------------------
10 
11 // History of changes from the original CommonUtils.hh file in
12 // SpartyJet v2.20
13 //
14 // 2009-01-15 Gregory Soyez <soyez@fastjet.fr>
15 //
16 // * put the code in the fastjet::atlas namespace
17 
18 #ifndef _JETCOMMONUTILS_HH_
19 #define _JETCOMMONUTILS_HH_
20 
21 #include <ctime>
22 #include <algorithm>
23 #include <cmath>
24 
25 #include <fastjet/internal/base.hh>
26 
27 FASTJET_BEGIN_NAMESPACE
28 
29 namespace atlas{
30 
31 // **************************************************************
32 // phi conversions
33 // **************************************************************
34 inline float to_minusPI_PI(float phi){
35  while(phi < -M_PI) phi += 2*M_PI;
36  while(phi >= M_PI) phi -= 2*M_PI;
37  return phi;
38 }
39 inline float to_zero_2PI(float phi){
40  while(phi < 0) phi += 2*M_PI;
41  while(phi >= 2*M_PI) phi -= 2*M_PI;
42  return phi;
43 }
44 
45 
46 
47 // **************************************************************
48 // List utils
49 // **************************************************************
50 // Destroy all pointers in a container, and clear it
51 // T must be a container of pointers ex. list<T2*>
52 template<class T>
53 void clear_list(T & list){
54  typedef typename T::iterator it_t;
55  it_t it = list.begin();
56  it_t itE = list.end();
57  for(; it != itE; ++it){
58  delete *it;
59  }
60  list.clear();
61 }
62 
63 
64 
65 
66 
67 // **************************************************************
68 // timing
69 // **************************************************************
70 class stopwatch {
71 public :
72  stopwatch() : m_total(0){};
73  void start(){m_last = std::clock();};
74  void resume(){m_last = std::clock();};
75  float pause() {
76  std::clock_t now=std::clock();
77  m_total = m_total + now - m_last;
78  m_last = now;
79  return convert();
80  }
81  float stop(){float t=pause(); m_total = std::clock_t(0); return t;}
82 protected:
83  std::clock_t m_last;
84  std::clock_t m_total;
85 
86  float convert(){ return float(m_total)*1000/CLOCKS_PER_SEC;}
87 };
88 
89 
90 } // namespace atlas
91 
92 FASTJET_END_NAMESPACE
93 #endif