HashTrait< G3D::uint128 > Struct Template Reference

#include <HashTrait.h>

Static Public Member Functions
static size_t	hashCode (G3D::uint128 key)

Member Function Documentation

static size_t HashTrait< G3D::uint128 >::hashCode ( G3D::uint128  key )

inlinestatic

 {
 return G3D::superFastHash(&key, sizeof(key));
 //return HashTrait<G3D::uint64>::hashCode(key.hi) ^ HashTrait<G3D::uint64>::hashCode(key.lo);

#if 0 // Really slow under gcc
 // Use the FNV-1 hash (http://isthe.com/chongo/tech/comp/fnv/#FNV-1).
 static const G3D::uint128 FNV_PRIME_128(1 << 24, 0x159);
 static const G3D::uint128 FNV_OFFSET_128(0xCF470AAC6CB293D2ULL, 0xF52F88BF32307F8FULL);

 G3D::uint128 hash = FNV_OFFSET_128;
 G3D::uint128 mask(0, 0xFF);
 for (int i = 0; i < 16; ++i) {
 hash *= FNV_PRIME_128;
 hash ^= (mask & key);
 key >>= 8;
 }
 
 G3D::uint64 foldedHash = hash.hi ^ hash.lo;
 return static_cast<size_t>((foldedHash >> 32) ^ (foldedHash & 0xFFFFFFFF));
#endif
 }

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The documentation for this struct was generated from the following file:

• dep/g3dlite/include/G3D/HashTrait.h