Export of internal Abseil changes

--
a0847bf19789c97689f1a8b0133a53b8af5e5caa by Samuel Benzaquen <sbenza@google.com>:

Add support for absl::(u)int128 to random distributions and generators.

PiperOrigin-RevId: 411565479
GitOrigin-RevId: a0847bf19789c97689f1a8b0133a53b8af5e5caa
Change-Id: Ide434bdd93fcab8e90f791796498de14833b667c

1 files changed, 7 insertions, 4 deletions

diff --git a/absl/random/poisson_distribution.h b/absl/random/poisson_distribution.h
index cb5f5d5d..f4573082 100644
--- a/absl/random/poisson_distribution.h
+++ b/absl/random/poisson_distribution.h
@@ -26,6 +26,7 @@
 #include "absl/random/internal/fastmath.h"
 #include "absl/random/internal/generate_real.h"
 #include "absl/random/internal/iostream_state_saver.h"
+#include "absl/random/internal/traits.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
@@ -80,7 +81,7 @@ class poisson_distribution {
     double log_k_;
     int split_;
 
-    static_assert(std::is_integral<IntType>::value,
+    static_assert(random_internal::IsIntegral<IntType>::value,
                   "Class-template absl::poisson_distribution<> must be "
                   "parameterized using an integral type.");
   };
@@ -133,7 +134,8 @@ template <typename IntType>
 poisson_distribution<IntType>::param_type::param_type(double mean)
     : mean_(mean), split_(0) {
   assert(mean >= 0);
-  assert(mean <= (std::numeric_limits<result_type>::max)());
+  assert(mean <=
+         static_cast<double>((std::numeric_limits<result_type>::max)()));
   // As a defensive measure, avoid large values of the mean.  The rejection
   // algorithm used does not support very large values well.  It my be worth
   // changing algorithms to better deal with these cases.
@@ -222,8 +224,9 @@ poisson_distribution<IntType>::operator()(
     // clang-format on
     const double lhs = 2.0 * std::log(u) + p.log_k_ + s;
     if (lhs < rhs) {
-      return x > (max)() ? (max)()
-                         : static_cast<result_type>(x);  // f(x)/k >= u^2
+      return x > static_cast<double>((max)())
+                 ? (max)()
+                 : static_cast<result_type>(x);  // f(x)/k >= u^2
     }
   }
 }