/usr/include/ompl/util/Hash.h is in libompl-dev 1.2.1+ds1-1build1.
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/* Author: Mark Moll */
#ifndef OMPL_UTIL_HASH_
#define OMPL_UTIL_HASH_
#include <functional>
#include <type_traits>
#include <utility>
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 std
{
template <class U, class V>
struct hash<std::pair<U,V> >
{
typedef std::pair<U,V> argument_type;
typedef std::size_t result_type;
result_type operator()(argument_type const& p) const
{
result_type h = std::hash<typename std::remove_cv<U>::type>()(p.first);
ompl::hash_combine(h, p.second);
return h;
}
};
}
#endif
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