Hash.h
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34 
35 /* Author: Mark Moll */
36 
37 #ifndef OMPL_UTIL_HASH_
38 #define OMPL_UTIL_HASH_
39 
40 #include <functional>
41 #include <type_traits>
42 #include <utility>
43 #include <vector>
44 #include <boost/functional/hash.hpp>
45 
46 namespace ompl
47 {
48  // copied from <boost/functional/hash.hpp>
49  template <class T>
50  inline void hash_combine(std::size_t &seed, const T &v)
51  {
52  std::hash<T> hasher;
53  seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
54  }
55 } // namespace ompl
56 
57 namespace std
58 {
59  template <class U, class V>
60  struct hash<std::pair<U, V>>
61  {
62  using argument_type = std::pair<U, V>;
63  using result_type = std::size_t;
64  result_type operator()(argument_type const &p) const
65  {
66  result_type h = std::hash<std::remove_cv_t<U>>()(p.first);
67  ompl::hash_combine(h, p.second);
68  return h;
69  }
70  };
71 
72  template <class T>
73  struct hash<std::vector<T>>
74  {
75  using argument_type = std::vector<T>;
76  using result_type = std::size_t;
77  result_type operator()(argument_type const &v) const
78  {
79  result_type h = 0;
80  boost::hash_range(h, v.begin(), v.end());
81  return h;
82  }
83  };
84 } // namespace std
85 
86 #endif
Main namespace. Contains everything in this library.
Definition: AppBase.h:22