.. _program_listing_file_src_ompl_util_Hash.h:

Program Listing for File Hash.h
===============================

|exhale_lsh| :ref:`Return to documentation for file <file_src_ompl_util_Hash.h>` (``src/ompl/util/Hash.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

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   /* Author: Mark Moll */
   
   #ifndef OMPL_UTIL_HASH_
   #define OMPL_UTIL_HASH_
   
   #include <functional>
   #include <type_traits>
   #include <utility>
   #include <vector>
   #include <boost/functional/hash.hpp>
   
   namespace ompl
   {
       // copied from <boost/functional/hash.hpp>
       template <class T>
       inline void hash_combine(std::size_t &seed, const T &v)
       {
           std::hash<T> hasher;
           seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
       }
   }  // namespace ompl
   
   namespace std
   {
       template <class U, class V>
       struct hash<std::pair<U, V>>
       {
           using argument_type = std::pair<U, V>;
           using result_type = std::size_t;
           result_type operator()(argument_type const &p) const
           {
               result_type h = std::hash<std::remove_cv_t<U>>()(p.first);
               ompl::hash_combine(h, p.second);
               return h;
           }
       };
   
       template <class T>
       struct hash<std::vector<T>>
       {
           using argument_type = std::vector<T>;
           using result_type = std::size_t;
           result_type operator()(argument_type const &v) const
           {
               result_type h = 0;
               boost::hash_range(h, v.begin(), v.end());
               return h;
           }
       };
   }  // namespace std
   
   #endif