about summary refs log tree commit diff
path: root/third_party/abseil_cpp/absl/flags/reflection.h
diff options
context:
space:
mode:
authorVincent Ambo <tazjin@google.com>2020-06-17T13·53+0100
committerVincent Ambo <tazjin@google.com>2020-06-17T13·53+0100
commit543379ce4572a4015c62812f93acb02938caece1 (patch)
tree797b0cbcc4795bbc73d9d5b2913e06156fa8614a /third_party/abseil_cpp/absl/flags/reflection.h
parentc224a738e7524fd0b6c8bed134f43b307bdbc9e8 (diff)
parent8f2828c4b4ce502d242eca80a80269448857f4a6 (diff)
merge(3p/abseil_cpp): Merge upstream at 'ccdbb5941' r/1011
Change-Id: I6e85fc7b5f76bba1f1eef15e600a8acb64e97ef5
Diffstat (limited to 'third_party/abseil_cpp/absl/flags/reflection.h')
-rw-r--r--third_party/abseil_cpp/absl/flags/reflection.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/flags/reflection.h b/third_party/abseil_cpp/absl/flags/reflection.h
new file mode 100644
index 000000000000..045f9784e269
--- /dev/null
+++ b/third_party/abseil_cpp/absl/flags/reflection.h
@@ -0,0 +1,85 @@
+//
+// 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/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.
+CommandLineFlag* FindCommandLineFlag(absl::string_view name);
+
+//------------------------------------------------------------------------------
+// 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_