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/********************* */
/*! \file hash.h
** \verbatim
** Top contributors (to current version):
** Morgan Deters, Andres Noetzli, Mathias Preiner
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
** in the top-level source directory and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#include "cvc4_public.h"
#ifndef CVC5__HASH_H
#define CVC5__HASH_H
#include <functional>
#include <string>
namespace std {
#ifdef CVC5_NEED_HASH_UINT64_T
// on some versions and architectures of GNU C++, we need a
// specialization of hash for 64-bit values
template <>
struct hash<uint64_t> {
size_t operator()(uint64_t v) const {
return v;
}
};/* struct hash<uint64_t> */
#endif /* CVC5_NEED_HASH_UINT64_T */
}/* std namespace */
namespace cvc5 {
namespace fnv1a {
/**
* FNV-1a hash algorithm for 64-bit numbers.
*
* More details here: http://www.isthe.com/chongo/tech/comp/fnv/index.html
*/
inline uint64_t fnv1a_64(uint64_t v, uint64_t hash = 14695981039346656037U) {
hash ^= v;
// Compute (hash * 1099511628211)
return hash + (hash << 1) + (hash << 4) + (hash << 5) + (hash << 7) +
(hash << 8) + (hash << 40);
}
} // namespace fnv1a
template <class T, class U, class HashT = std::hash<T>, class HashU = std::hash<U> >
struct PairHashFunction {
size_t operator()(const std::pair<T, U>& pr) const {
uint64_t hash = fnv1a::fnv1a_64(HashT()(pr.first));
return static_cast<size_t>(fnv1a::fnv1a_64(HashU()(pr.second), hash));
}
};/* struct PairHashFunction */
} // namespace cvc5
#endif /* CVC5__HASH_H */
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