ojhBitfield64co function hashes
64-bit Bitfield hash
Implementation
int ojhBitfield64co(Iterable<Card> cards) {
int h = 0;
for (Card c in cards) {
assert(0 == (h & (1 << (0x3F & c.index))));
h |= (1 << (0x3F & c.index));
}
return h;
}