Fix off-by-one error in PRNG.
BUG=
Review URL: https://codereview.webrtc.org/1412183002
Cr-Commit-Position: refs/heads/master@{#10328}
diff --git a/webrtc/test/random.cc b/webrtc/test/random.cc
index 8877ed4..c4c405f 100644
--- a/webrtc/test/random.cc
+++ b/webrtc/test/random.cc
@@ -22,11 +22,11 @@
}
float Random::Rand() {
- const float kScale = 1.0f / 0xffffffff;
- float result = kScale * b_;
+ const double kScale = 1.0f / (static_cast<uint64_t>(1) << 32);
+ double result = kScale * b_;
a_ ^= b_;
b_ += a_;
- return result;
+ return static_cast<float>(result);
}
int Random::Rand(int low, int high) {
diff --git a/webrtc/test/random.h b/webrtc/test/random.h
index 9a0bc9e..5cc54f2 100644
--- a/webrtc/test/random.h
+++ b/webrtc/test/random.h
@@ -22,10 +22,10 @@
public:
explicit Random(uint32_t seed);
- // Return pseudo-random number in the interval [0.0, 1.0].
+ // Return pseudo-random number in the interval [0.0, 1.0).
float Rand();
- // Return pseudo rounded random number in interval [low, high].
+ // Return pseudo-random number mapped to the interval [low, high].
int Rand(int low, int high);
// Normal Distribution.
