random.h
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30 
31 #ifndef RTABMAP_FLANN_RANDOM_H
32 #define RTABMAP_FLANN_RANDOM_H
33 
34 #include <algorithm>
35 #include <cstdlib>
36 #include <cstddef>
37 #include <vector>
38 #include <random>
39 
40 #include "rtflann/general.h"
41 
42 namespace rtflann
43 {
44 
49 inline void seed_random(unsigned int seed)
50 {
51  srand(seed);
52 }
53 
54 /*
55  * Generates a random double value.
56  */
63 inline double rand_double(double high = 1.0, double low = 0)
64 {
65  return low + ((high-low) * (std::rand() / (RAND_MAX + 1.0)));
66 }
67 
74 inline int rand_int(int high = RAND_MAX, int low = 0)
75 {
76  return low + (int) ( double(high-low) * (std::rand() / (RAND_MAX + 1.0)));
77 }
78 
79 
84 class UniqueRandom
85 {
86  std::vector<int> vals_;
87  int size_;
88  int counter_;
89 
90 public:
96  UniqueRandom(int n)
97  {
98  init(n);
99  }
100 
105  void init(int n)
106  {
107  // create and initialize an array of size n
108  vals_.resize(n);
109  size_ = n;
110  for (int i = 0; i < size_; ++i) vals_[i] = i;
111 
112  // shuffle the elements in the array
113  std::random_device rd;
114  std::mt19937 g(rd());
115  std::shuffle(vals_.begin(), vals_.end(), g);
116 
117  counter_ = 0;
118  }
119 
125  int next()
126  {
127  if (counter_ == size_) {
128  return -1;
129  }
130  else {
131  return vals_[counter_++];
132  }
133  }
134 };
135 
136 }
137 
138 #endif //FLANN_RANDOM_H
139 
140 
int
int
general.h
rtflann::UniqueRandom::next
int next()
Definition: random.h:153
rtflann::UniqueRandom::init
void init(int n)
Definition: random.h:133
n
int n
rtflann::UniqueRandom::UniqueRandom
UniqueRandom(int n)
Definition: random.h:124
rtflann::rand_int
int rand_int(int high=RAND_MAX, int low=0)
Definition: random.h:102
rtflann::seed_random
void seed_random(unsigned int seed)
Definition: random.h:77
g
float g
rtflann::UniqueRandom::counter_
int counter_
Definition: random.h:116
rtflann::rand_double
double rand_double(double high=1.0, double low=0)
Definition: random.h:91
rtflann::UniqueRandom::size_
int size_
Definition: random.h:115
rtflann::UniqueRandom::vals_
std::vector< int > vals_
Definition: random.h:114
rtflann
Definition: all_indices.h:49
i
int i


rtabmap
Author(s): Mathieu Labbe
autogenerated on Thu Jul 25 2024 02:50:15