Abseil Common Libraries (C++) (grcp 依赖)
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60 lines
2.0 KiB
60 lines
2.0 KiB
// |
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// Copyright 2018 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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#ifndef ABSL_STRINGS_CORD_TEST_HELPERS_H_ |
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#define ABSL_STRINGS_CORD_TEST_HELPERS_H_ |
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#include "absl/strings/cord.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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// Creates a multi-segment Cord from an iterable container of strings. The |
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// resulting Cord is guaranteed to have one segment for every string in the |
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// container. This allows code to be unit tested with multi-segment Cord |
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// inputs. |
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// |
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// Example: |
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// |
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// absl::Cord c = absl::MakeFragmentedCord({"A ", "fragmented ", "Cord"}); |
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// EXPECT_FALSE(c.GetFlat(&unused)); |
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// |
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// The mechanism by which this Cord is created is an implementation detail. Any |
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// implementation that produces a multi-segment Cord may produce a flat Cord in |
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// the future as new optimizations are added to the Cord class. |
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// MakeFragmentedCord will, however, always be updated to return a multi-segment |
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// Cord. |
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template <typename Container> |
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Cord MakeFragmentedCord(const Container& c) { |
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Cord result; |
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for (const auto& s : c) { |
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auto* external = new std::string(s); |
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Cord tmp = absl::MakeCordFromExternal( |
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*external, [external](absl::string_view) { delete external; }); |
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tmp.Prepend(result); |
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result = tmp; |
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} |
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return result; |
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} |
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inline Cord MakeFragmentedCord(std::initializer_list<absl::string_view> list) { |
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return MakeFragmentedCord<std::initializer_list<absl::string_view>>(list); |
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} |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_STRINGS_CORD_TEST_HELPERS_H_
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