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| author | Aina Niemetz <aina.niemetz@gmail.com> | 2017-12-29 18:08:41 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-12-29 18:08:41 -0800 |
| commit | 2d147b72e1339f4c281caf7786dfa9b4d79ed21c (patch) | |
| tree | f4b2d78feea05ccbf4ff774d1c9bd3c6f473d9dd /src/util/random.h | |
| parent | 47d542f312ac8e22e8d3aae1007cfd13701983a6 (diff) | |
Fix RNG for seed = 0. (#1459)
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.
Diffstat (limited to 'src/util/random.h')
| -rw-r--r-- | src/util/random.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/util/random.h b/src/util/random.h index 9083c63e4..1e837642e 100644 --- a/src/util/random.h +++ b/src/util/random.h @@ -28,7 +28,7 @@ namespace CVC4 { class Random { public: - Random(uint64_t seed) : d_seed(seed), d_state(seed) {} + Random(uint64_t seed) { setSeed(seed); } /* Get current RNG (singleton). */ static Random& getRandom() @@ -40,8 +40,8 @@ class Random /* Set seed of Random. */ void setSeed(uint64_t seed) { - d_seed = seed; - d_state = seed; + d_seed = seed == 0 ? ~seed : seed; + d_state = d_seed; } /* Next random uint64_t number. */ |