Abseil Common Libraries (C++) (grcp 依赖)
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85 lines
2.6 KiB
85 lines
2.6 KiB
// |
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// Copyright 2020 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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// ----------------------------------------------------------------------------- |
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// File: reflection.h |
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// ----------------------------------------------------------------------------- |
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// |
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// This file defines the routines to access and operate on an Abseil Flag's |
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// reflection handle. |
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#ifndef ABSL_FLAGS_REFLECTION_H_ |
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#define ABSL_FLAGS_REFLECTION_H_ |
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#include <string> |
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#include "absl/base/config.h" |
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#include "absl/flags/commandlineflag.h" |
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#include "absl/flags/internal/commandlineflag.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace flags_internal { |
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class FlagSaverImpl; |
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} // namespace flags_internal |
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// FindCommandLineFlag() |
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// |
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// Returns the reflection handle of an Abseil flag of the specified name, or |
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// `nullptr` if not found. This function will emit a warning if the name of a |
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// 'retired' flag is specified. |
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CommandLineFlag* FindCommandLineFlag(absl::string_view name); |
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//------------------------------------------------------------------------------ |
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// FlagSaver |
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//------------------------------------------------------------------------------ |
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// |
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// A FlagSaver object stores the state of flags in the scope where the FlagSaver |
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// is defined, allowing modification of those flags within that scope and |
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// automatic restoration of the flags to their previous state upon leaving the |
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// scope. |
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// |
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// A FlagSaver can be used within tests to temporarily change the test |
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// environment and restore the test case to its previous state. |
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// |
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// Example: |
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// |
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// void MyFunc() { |
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// absl::FlagSaver fs; |
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// ... |
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// absl::SetFlag(FLAGS_myFlag, otherValue); |
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// ... |
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// } // scope of FlagSaver left, flags return to previous state |
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// |
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// This class is thread-safe. |
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class FlagSaver { |
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public: |
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FlagSaver(); |
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~FlagSaver(); |
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FlagSaver(const FlagSaver&) = delete; |
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void operator=(const FlagSaver&) = delete; |
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private: |
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flags_internal::FlagSaverImpl* impl_; |
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}; |
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//----------------------------------------------------------------------------- |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_FLAGS_REFLECTION_H_
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