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Use std::shuffle (with Random as the unified random generator) instead
of std::random_shuffle for deterministic, reproducable random shuffling.
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Removes some hacks due to Swig 2's incomplete C++11 support and adds
checks for version 3 at configuration time as well as in swig.h
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The default value for the seed for CVC4's RNG is 0. However, xorshift* requires a non-zero seed, else it generates only zero values. This fixes and prevents this behavior by resetting a given zero seed to ~0.
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This adds a deterministic (seeded) random number generator (RNG). It implements the xorshift* generator (see S. Vigna, An experimental exploration of Marsaglia's xorshift generators, scrambled. ACM Trans. Math. Softw. 42(4): 30:1-30:23, 2016).
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