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Re:PCG, A Family of Better Random Number Generators by netheril96 on Wednesday July 15, 2015 @03:51AM (#9890213)
What is the stream parameter in the constructor `explicit ChaCha(uint64_t seedval, uint64_t stream = 0);`?
Re:PCG, A Family of Better Random Number Generators by nightcracker on Wednesday July 15, 2015 @06:15AM (#9890549)
It allows you to make multiple parallel streams of random data with the same seed.

If you prefer, you can see the seed + stream as a combined 128 bit seed.