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Alex Rivera
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The boost::hash_combine template function takes a reference to a hash (called seed ) and an object v . According to the docs , it combines seed with the hash of v by seed ^= hash_value(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2); I can see that this is deterministic. I see why a XOR is used. I bet the addition helps in mapping similar values widely apart so probing hash tables won't break down, but can someone explain what the magic constant is?
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