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Diffstat (limited to 'absl/strings/cord_test_helpers.h')
-rw-r--r-- | absl/strings/cord_test_helpers.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/absl/strings/cord_test_helpers.h b/absl/strings/cord_test_helpers.h new file mode 100644 index 000000000000..f1036e3b1388 --- /dev/null +++ b/absl/strings/cord_test_helpers.h @@ -0,0 +1,60 @@ +// +// 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_ |