Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.8 KiB
90 lines
2.8 KiB
// |
|
// Copyright 2020 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. |
|
// |
|
// ----------------------------------------------------------------------------- |
|
// File: reflection.h |
|
// ----------------------------------------------------------------------------- |
|
// |
|
// This file defines the routines to access and operate on an Abseil Flag's |
|
// reflection handle. |
|
|
|
#ifndef ABSL_FLAGS_REFLECTION_H_ |
|
#define ABSL_FLAGS_REFLECTION_H_ |
|
|
|
#include <string> |
|
|
|
#include "absl/base/config.h" |
|
#include "absl/container/flat_hash_map.h" |
|
#include "absl/flags/commandlineflag.h" |
|
#include "absl/flags/internal/commandlineflag.h" |
|
|
|
namespace absl { |
|
ABSL_NAMESPACE_BEGIN |
|
namespace flags_internal { |
|
class FlagSaverImpl; |
|
} // namespace flags_internal |
|
|
|
// FindCommandLineFlag() |
|
// |
|
// Returns the reflection handle of an Abseil flag of the specified name, or |
|
// `nullptr` if not found. This function will emit a warning if the name of a |
|
// 'retired' flag is specified. |
|
absl::CommandLineFlag* FindCommandLineFlag(absl::string_view name); |
|
|
|
// Returns current state of the Flags registry in a form of mapping from flag |
|
// name to a flag reflection handle. |
|
absl::flat_hash_map<absl::string_view, absl::CommandLineFlag*> GetAllFlags(); |
|
|
|
//------------------------------------------------------------------------------ |
|
// FlagSaver |
|
//------------------------------------------------------------------------------ |
|
// |
|
// A FlagSaver object stores the state of flags in the scope where the FlagSaver |
|
// is defined, allowing modification of those flags within that scope and |
|
// automatic restoration of the flags to their previous state upon leaving the |
|
// scope. |
|
// |
|
// A FlagSaver can be used within tests to temporarily change the test |
|
// environment and restore the test case to its previous state. |
|
// |
|
// Example: |
|
// |
|
// void MyFunc() { |
|
// absl::FlagSaver fs; |
|
// ... |
|
// absl::SetFlag(&FLAGS_myFlag, otherValue); |
|
// ... |
|
// } // scope of FlagSaver left, flags return to previous state |
|
// |
|
// This class is thread-safe. |
|
|
|
class FlagSaver { |
|
public: |
|
FlagSaver(); |
|
~FlagSaver(); |
|
|
|
FlagSaver(const FlagSaver&) = delete; |
|
void operator=(const FlagSaver&) = delete; |
|
|
|
private: |
|
flags_internal::FlagSaverImpl* impl_; |
|
}; |
|
|
|
//----------------------------------------------------------------------------- |
|
|
|
ABSL_NAMESPACE_END |
|
} // namespace absl |
|
|
|
#endif // ABSL_FLAGS_REFLECTION_H_
|
|
|