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, 47 insertions, 0 deletions

diff --git a/third_party/abseil_cpp/absl/random/internal/distribution_caller.h b/third_party/abseil_cpp/absl/random/internal/distribution_caller.h
new file mode 100644
index 000000000000..4e0724440cbc
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+++ b/third_party/abseil_cpp/absl/random/internal/distribution_caller.h
@@ -0,0 +1,47 @@
+//
+// Copyright 2018 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_DISTRIBUTION_CALLER_H_
+#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
+
+#include <utility>
+
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace random_internal {
+
+// DistributionCaller provides an opportunity to overload the general
+// mechanism for calling a distribution, allowing for mock-RNG classes
+// to intercept such calls.
+template <typename URBG>
+struct DistributionCaller {
+  // Call the provided distribution type. The parameters are expected
+  // to be explicitly specified.
+  // DistrT is the distribution type.
+  template <typename DistrT, typename... Args>
+  static typename DistrT::result_type Call(URBG* urbg, Args&&... args) {
+    DistrT dist(std::forward<Args>(args)...);
+    return dist(*urbg);
+  }
+};
+
+}  // namespace random_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_