diff options
Diffstat (limited to 'absl/random/exponential_distribution.h')
| -rw-r--r-- | absl/random/exponential_distribution.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/absl/random/exponential_distribution.h b/absl/random/exponential_distribution.h index ed5551ae..b5caf8a1 100644 --- a/absl/random/exponential_distribution.h +++ b/absl/random/exponential_distribution.h @@ -21,12 +21,13 @@ #include <limits> #include <type_traits> -#include "absl/random/internal/distribution_impl.h" +#include "absl/meta/type_traits.h" #include "absl/random/internal/fast_uniform_bits.h" +#include "absl/random/internal/generate_real.h" #include "absl/random/internal/iostream_state_saver.h" namespace absl { -inline namespace lts_2019_08_08 { +ABSL_NAMESPACE_BEGIN // absl::exponential_distribution: // Generates a number conforming to an exponential distribution and is @@ -119,9 +120,14 @@ typename exponential_distribution<RealType>::result_type exponential_distribution<RealType>::operator()( URBG& g, // NOLINT(runtime/references) const param_type& p) { - using random_internal::NegativeValueT; - const result_type u = random_internal::RandU64ToReal< - result_type>::template Value<NegativeValueT, false>(fast_u64_(g)); + using random_internal::GenerateNegativeTag; + using random_internal::GenerateRealFromBits; + using real_type = + absl::conditional_t<std::is_same<RealType, float>::value, float, double>; + + const result_type u = GenerateRealFromBits<real_type, GenerateNegativeTag, + false>(fast_u64_(g)); // U(-1, 0) + // log1p(-x) is mathematically equivalent to log(1 - x) but has more // accuracy for x near zero. return p.neg_inv_lambda_ * std::log1p(u); @@ -153,7 +159,7 @@ std::basic_istream<CharT, Traits>& operator>>( return is; } -} // inline namespace lts_2019_08_08 +ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_RANDOM_EXPONENTIAL_DISTRIBUTION_H_ |