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#pragma once
#include <cstdint>
// Java doesn't have a default hash value for ints, however, the hashmap itself does some "supplemental" hashing, so
// our ints actually get hashed by code as implemented below. std templates *do* have a standard hash for ints, but it
// would appear to be a bit expensive so matching the java one for now anyway. This code implements the supplemental
// hashing that happens in java so we can match what their maps are doing with ints.
struct IntKeyHash
{
inline int operator()(const int &k) const
{
int h = k;
h += ~(h << 9);
h ^= (static_cast<unsigned int>(h) >> 14);
h += (h << 4);
h ^= (static_cast<unsigned int>(h) >> 10);
return h;
}
};
struct IntKeyEq
{
inline bool operator()(const int &x, const int &y) const
{ return x==y; }
};
// This hash functor is taken from the IntHashMap java class used by the game, so that we can use a standard std hashmap with this hash rather
// than implement the class itself
struct IntKeyHash2
{
inline int operator()(const int &k) const
{
unsigned int h = static_cast<unsigned int>(k);
h ^= (h >> 20) ^ (h >> 12);
return static_cast<int>(h ^ (h >> 7) ^ (h >> 4));
}
};
// This hash functor is taken from the LongHashMap java class used by the game, so that we can use a standard std hashmap with this hash rather
// than implement the class itself
struct LongKeyHash
{
inline int hash(const int &k) const
{
unsigned int h = static_cast<unsigned int>(k);
h ^= (h >> 20) ^ (h >> 12);
return static_cast<int>(h ^ (h >> 7) ^ (h >> 4));
}
inline int operator()(const int64_t &k) const
{
return hash(static_cast<int>(k ^ ((static_cast<uint64_t>(k)) >> 32)));
}
};
struct LongKeyEq
{
inline bool operator() (const int64_t &x, const int64_t &y) const
{ return x == y; }
};
enum eINSTANCEOF;
struct eINSTANCEOFKeyHash
{
int operator()(const eINSTANCEOF &k) const
{
unsigned int h = static_cast<unsigned int>(k);
h ^= (h >> 20) ^ (h >> 12);
return static_cast<int>(h ^ (h >> 7) ^ (h >> 4));
}
};
struct eINSTANCEOFKeyEq
{
inline bool operator()(const eINSTANCEOF &x, const eINSTANCEOF &y) const
{ return x == y; }
};
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