初始化工程

Protobuf/ProtobufCompiler/include/google/protobuf/cpp_features.proto

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+// Protocol Buffers - Google's data interchange format
+// Copyright 2023 Google Inc.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+syntax = "proto2";
+
+package pb;
+
+import "google/protobuf/descriptor.proto";
+
+extend google.protobuf.FeatureSet {
+  optional CppFeatures cpp = 1000;
+}
+
+message CppFeatures {
+  // Whether or not to treat an enum field as closed.  This option is only
+  // applicable to enum fields, and will be removed in the future.  It is
+  // consistent with the legacy behavior of using proto3 enum types for proto2
+  // fields.
+  optional bool legacy_closed_enum = 1 [
+    retention = RETENTION_RUNTIME,
+    targets = TARGET_TYPE_FIELD,
+    targets = TARGET_TYPE_FILE,
+    feature_support = {
+      edition_introduced: EDITION_2023,
+      edition_deprecated: EDITION_2023,
+      deprecation_warning: "The legacy closed enum behavior in C++ is "
+                           "deprecated and is scheduled to be removed in "
+                           "edition 2025.  See http://protobuf.dev/programming-guides/enum/#cpp for "
+                           "more information",
+    },
+    edition_defaults = { edition: EDITION_LEGACY, value: "true" },
+    edition_defaults = { edition: EDITION_PROTO3, value: "false" }
+  ];
+
+  enum StringType {
+    STRING_TYPE_UNKNOWN = 0;
+    VIEW = 1;
+    CORD = 2;
+    STRING = 3;
+  }
+
+  optional StringType string_type = 2 [
+    retention = RETENTION_RUNTIME,
+    targets = TARGET_TYPE_FIELD,
+    targets = TARGET_TYPE_FILE,
+    feature_support = {
+      edition_introduced: EDITION_2023,
+    },
+    edition_defaults = { edition: EDITION_LEGACY, value: "STRING" },
+    edition_defaults = { edition: EDITION_2024, value: "VIEW" }
+  ];
+
+  optional bool enum_name_uses_string_view = 3 [
+    retention = RETENTION_SOURCE,
+    targets = TARGET_TYPE_ENUM,
+    targets = TARGET_TYPE_FILE,
+    feature_support = {
+      edition_introduced: EDITION_2024,
+    },
+    edition_defaults = { edition: EDITION_LEGACY, value: "false" },
+    edition_defaults = { edition: EDITION_2024, value: "true" }
+  ];
+}