mirror of https://github.com/qt/qtgrpc.git
2e3fdd5c05
This patch adds support for 'oneof', a union-like type in protobuf, that need not contain a value, with the following features: - Setting a oneof field will automatically clear all other members of the oneof. - If the parser encounters multiple members of the same oneof on the wire, only the last member seen is used in the parsed message. - A oneof cannot be repeated. - A oneof cannot contain repeated or map fields. - If you set a oneof field to the default value (even the default, such as 0 for an int32 oneof field), the "case" of that oneof field will be set, and the value will be serialized on the wire. Unlike the reference C++ implementation, the Qt implementation of 'oneof' fields adds the 'has<PropertyName>' functions for every 'oneof' member. The protobuf generator generates a Q_PROPERTY for each member of the 'oneof'; these properties are collectively implemented as a single class member. 'oneof' fields are represented by the QtProtobufPrivate::QProtobufOptional class. The class holds the 'oneof' field number and the value that it contains as QVariant. A QExplicitSharedDataPointer is used as reference counter, and to copy and to free the memory of protobuf messages that are stored inside the nested QVariant as pointers. The class could also be used to hold 'optional' fields in follow up commits, but has small overhead since it holds field number, that is not used by optional fields. The generated classes also allows reading field number that is currently stored in the 'oneof' field. The QtProtobuf::InvalidFieldNumber constant indicates that oneof fields is uninitialized. The serialization and deserialization tests use the expected values from the results of the reference C++ serialization(protobuf version 3.19). Task-number: QTBUG-103981 Change-Id: Ie4053cb164bba6bc5f14f8cedb34bad62a638c43 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io> |
||
|---|---|---|
| .. | ||
| auto | ||
| manual/qprotobuf | ||
| CMakeLists.txt | ||