diff options
Diffstat (limited to 'absl/random/poisson_distribution.h')
| -rw-r--r-- | absl/random/poisson_distribution.h | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/absl/random/poisson_distribution.h b/absl/random/poisson_distribution.h index 7750b1c9..23a953ff 100644 --- a/absl/random/poisson_distribution.h +++ b/absl/random/poisson_distribution.h @@ -22,9 +22,9 @@ #include <ostream> #include <type_traits> -#include "absl/random/internal/distribution_impl.h" #include "absl/random/internal/fast_uniform_bits.h" #include "absl/random/internal/fastmath.h" +#include "absl/random/internal/generate_real.h" #include "absl/random/internal/iostream_state_saver.h" namespace absl { @@ -164,9 +164,9 @@ typename poisson_distribution<IntType>::result_type poisson_distribution<IntType>::operator()( URBG& g, // NOLINT(runtime/references) const param_type& p) { - using random_internal::PositiveValueT; - using random_internal::RandU64ToDouble; - using random_internal::SignedValueT; + using random_internal::GeneratePositiveTag; + using random_internal::GenerateRealFromBits; + using random_internal::GenerateSignedTag; if (p.split_ != 0) { // Use Knuth's algorithm with range splitting to avoid floating-point @@ -186,7 +186,8 @@ poisson_distribution<IntType>::operator()( for (int split = p.split_; split > 0; --split) { double r = 1.0; do { - r *= RandU64ToDouble<PositiveValueT, true>(fast_u64_(g)); + r *= GenerateRealFromBits<double, GeneratePositiveTag, true>( + fast_u64_(g)); // U(-1, 0) ++n; } while (r > p.emu_); --n; @@ -205,10 +206,11 @@ poisson_distribution<IntType>::operator()( // and k = max(f). const double a = p.mean_ + 0.5; for (;;) { - const double u = - RandU64ToDouble<PositiveValueT, false>(fast_u64_(g)); // (0, 1) - const double v = - RandU64ToDouble<SignedValueT, false>(fast_u64_(g)); // (-1, 1) + const double u = GenerateRealFromBits<double, GeneratePositiveTag, false>( + fast_u64_(g)); // U(0, 1) + const double v = GenerateRealFromBits<double, GenerateSignedTag, false>( + fast_u64_(g)); // U(-1, 1) + const double x = std::floor(p.s_ * v / u + a); if (x < 0) continue; // f(negative) = 0 const double rhs = x * p.lmu_; |