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/********************* */
/*! \file hash.h
** \verbatim
** Original author: cconway
** Major contributors: mdeters
** Minor contributors (to current version): taking
** This file is part of the CVC4 prototype.
** Copyright (c) 2009-2012 New York University and The University of Iowa
** 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 __CVC4__HASH_H
#define __CVC4__HASH_H
// in case it's not been declared as a namespace yet
namespace __gnu_cxx {}
#include <ext/hash_map>
#include <ext/hash_set>
namespace __gnu_cxx {
#ifdef CVC4_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 /* CVC4_NEED_HASH_UINT64_T */
}/* __gnu_cxx namespace */
// hackish: treat hash stuff as if it were in std namespace
namespace std { using namespace __gnu_cxx; }
namespace CVC4 {
struct StringHashFunction {
size_t operator()(const std::string& str) const {
return std::hash<const char*>()(str.c_str());
}
};/* struct StringHashFunction */
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 {
return HashT()(pr.first) ^ HashU()(pr.second);
}
};/* struct PairHashFunction */
}/* CVC4 namespace */
#endif /* __CVC4__HASH_H */
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