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
46namespace 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
57namespace 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.
STL namespace.