diff options
Diffstat (limited to 'src/leveldb/util/random.h')
| -rw-r--r-- | src/leveldb/util/random.h | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/src/leveldb/util/random.h b/src/leveldb/util/random.h index ddd51b1c7b..76f7daf52a 100644 --- a/src/leveldb/util/random.h +++ b/src/leveldb/util/random.h @@ -15,6 +15,7 @@ namespace leveldb { class Random { private: uint32_t seed_; + public: explicit Random(uint32_t s) : seed_(s & 0x7fffffffu) { // Avoid bad seeds. @@ -23,8 +24,8 @@ class Random { } } uint32_t Next() { - static const uint32_t M = 2147483647L; // 2^31-1 - static const uint64_t A = 16807; // bits 14, 8, 7, 5, 2, 1, 0 + static const uint32_t M = 2147483647L; // 2^31-1 + static const uint64_t A = 16807; // bits 14, 8, 7, 5, 2, 1, 0 // We are computing // seed_ = (seed_ * A) % M, where M = 2^31-1 // @@ -54,9 +55,7 @@ class Random { // Skewed: pick "base" uniformly from range [0,max_log] and then // return "base" random bits. The effect is to pick a number in the // range [0,2^max_log-1] with exponential bias towards smaller numbers. - uint32_t Skewed(int max_log) { - return Uniform(1 << Uniform(max_log + 1)); - } + uint32_t Skewed(int max_log) { return Uniform(1 << Uniform(max_log + 1)); } }; } // namespace leveldb |