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/strings/cord_test_helpers.h b/third_party/abseil_cpp/absl/strings/cord_test_helpers.h
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index 000000000000..f1036e3b1388
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+++ b/third_party/abseil_cpp/absl/strings/cord_test_helpers.h
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+//
+// 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_STRINGS_CORD_TEST_HELPERS_H_
+#define ABSL_STRINGS_CORD_TEST_HELPERS_H_
+
+#include "absl/strings/cord.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Creates a multi-segment Cord from an iterable container of strings.  The
+// resulting Cord is guaranteed to have one segment for every string in the
+// container.  This allows code to be unit tested with multi-segment Cord
+// inputs.
+//
+// Example:
+//
+//   absl::Cord c = absl::MakeFragmentedCord({"A ", "fragmented ", "Cord"});
+//   EXPECT_FALSE(c.GetFlat(&unused));
+//
+// The mechanism by which this Cord is created is an implementation detail.  Any
+// implementation that produces a multi-segment Cord may produce a flat Cord in
+// the future as new optimizations are added to the Cord class.
+// MakeFragmentedCord will, however, always be updated to return a multi-segment
+// Cord.
+template <typename Container>
+Cord MakeFragmentedCord(const Container& c) {
+  Cord result;
+  for (const auto& s : c) {
+    auto* external = new std::string(s);
+    Cord tmp = absl::MakeCordFromExternal(
+        *external, [external](absl::string_view) { delete external; });
+    tmp.Prepend(result);
+    result = tmp;
+  }
+  return result;
+}
+
+inline Cord MakeFragmentedCord(std::initializer_list<absl::string_view> list) {
+  return MakeFragmentedCord<std::initializer_list<absl::string_view>>(list);
+}
+
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_STRINGS_CORD_TEST_HELPERS_H_