Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3' r/781

git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54beb5796cd408fbe15d2d2da09ff37adf
git-subtree-split: 768eb2ca2857342673fcd462792ce04b8bac3fa3

1 files changed, 60 insertions, 0 deletions

diff --git a/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h b/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h
new file mode 100644
index 000000000000..bc96a12cd29c
--- /dev/null
+++ b/third_party/abseil_cpp/absl/random/internal/sequence_urbg.h
@@ -0,0 +1,60 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
+#define ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
+
+#include <cstdint>
+#include <cstring>
+#include <limits>
+#include <type_traits>
+#include <vector>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// `sequence_urbg` is a simple random number generator which meets the
+// requirements of [rand.req.urbg], and is solely for testing absl
+// distributions.
+class sequence_urbg {
+ public:
+  using result_type = uint64_t;
+
+  static constexpr result_type(min)() {
+    return (std::numeric_limits<result_type>::min)();
+  }
+  static constexpr result_type(max)() {
+    return (std::numeric_limits<result_type>::max)();
+  }
+
+  sequence_urbg(std::initializer_list<result_type> data) : i_(0), data_(data) {}
+  void reset() { i_ = 0; }
+
+  result_type operator()() { return data_[i_++ % data_.size()]; }
+
+  size_t invocations() const { return i_; }
+
+ private:
+  size_t i_;
+  std::vector<result_type> data_;
+};
+
+}  // namespace random_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_