QGrpcCallOptions: transform into implicitly shared value class

As this class is copyable and really looks like a implicitly shared
value class transform it into such.

Also provide the missing testcase to this class.

Task-number: QTBUG-123625
Pick-to: 6.8
Change-Id: Ibdd24155a04b0ba8a622998cbc482428965e2288
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>

src/grpc/qgrpccalloptions.cpp

@@ -1,10 +1,10 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
-#include <QtGrpc/private/qtgrpcglobal_p.h>
 #include <QtGrpc/qgrpccalloptions.h>
 
 #include <QtCore/qdebug.h>
+#include <QtCore/qvariant.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -20,22 +20,19 @@ using namespace Qt::StringLiterals;
     that are used by gRPC channels to communicate with the services.
 */
 
-class QGrpcCallOptionsPrivate
+class QGrpcCallOptionsPrivate : public QSharedData
 {
 public:
     std::optional<QGrpcDuration> deadline;
     QGrpcMetadata metadata;
 };
 
-static void dPtrDeleter(QGrpcCallOptionsPrivate *ptr)
-{
-    delete ptr;
-}
+QT_DEFINE_QESDP_SPECIALIZATION_DTOR(QGrpcCallOptionsPrivate)
 
 /*!
     Constructs an empty QGrpcCallOptions object.
 */
-QGrpcCallOptions::QGrpcCallOptions() : dPtr(new QGrpcCallOptionsPrivate(), dPtrDeleter)
+QGrpcCallOptions::QGrpcCallOptions() : d_ptr(new QGrpcCallOptionsPrivate())
 {
 }
 
@@ -47,21 +44,13 @@ QGrpcCallOptions::~QGrpcCallOptions() = default;
 /*!
     Construct a copy of QGrpcCallOptions with \a other object.
 */
-QGrpcCallOptions::QGrpcCallOptions(const QGrpcCallOptions &other)
-    : dPtr(new QGrpcCallOptionsPrivate(*other.dPtr), dPtrDeleter)
-{
-}
+QGrpcCallOptions::QGrpcCallOptions(const QGrpcCallOptions &other) = default;
 
 /*!
     Assigns \a other to this QGrpcCallOptions and returns a reference to this
     QGrpcCallOptions.
 */
-QGrpcCallOptions &QGrpcCallOptions::operator=(const QGrpcCallOptions &other)
-{
-    if (this != &other)
-        *dPtr = *other.dPtr;
-    return *this;
-}
+QGrpcCallOptions &QGrpcCallOptions::operator=(const QGrpcCallOptions &other) = default;
 
 /*!
     \fn QGrpcCallOptions::QGrpcCallOptions(QGrpcCallOptions &&other) noexcept
@@ -82,6 +71,15 @@ QGrpcCallOptions &QGrpcCallOptions::operator=(const QGrpcCallOptions &other)
     value.
 */
 
+/*!
+    \since 6.8
+    Constructs a new QVariant object from this QGrpcCallOptions.
+*/
+QGrpcCallOptions::operator QVariant() const
+{
+    return QVariant::fromValue(*this);
+}
+
 /*!
     \since 6.8
     \fn void QGrpcCallOptions::swap(QGrpcCallOptions &other) noexcept
@@ -93,7 +91,11 @@ QGrpcCallOptions &QGrpcCallOptions::operator=(const QGrpcCallOptions &other)
 */
 QGrpcCallOptions &QGrpcCallOptions::setDeadline(QGrpcDuration deadline)
 {
-    dPtr->deadline = deadline;
+    if (d_ptr->deadline == deadline)
+        return *this;
+    d_ptr.detach();
+    Q_D(QGrpcCallOptions);
+    d->deadline = deadline;
     return *this;
 }
 
@@ -105,7 +107,11 @@ QGrpcCallOptions &QGrpcCallOptions::setDeadline(QGrpcDuration deadline)
 */
 QGrpcCallOptions &QGrpcCallOptions::setMetadata(const QGrpcMetadata &metadata)
 {
-    dPtr->metadata = metadata;
+    if (d_ptr->metadata == metadata)
+        return *this;
+    d_ptr.detach();
+    Q_D(QGrpcCallOptions);
+    d->metadata = metadata;
     return *this;
 }
 
@@ -114,9 +120,13 @@ QGrpcCallOptions &QGrpcCallOptions::setMetadata(const QGrpcMetadata &metadata)
 
     \sa setMetadata()
 */
-QGrpcCallOptions &QGrpcCallOptions::setMetadata(QGrpcMetadata &&metadata) noexcept
+QGrpcCallOptions &QGrpcCallOptions::setMetadata(QGrpcMetadata &&metadata)
 {
-    dPtr->metadata = std::move(metadata);
+    if (d_ptr->metadata == metadata)
+        return *this;
+    d_ptr.detach();
+    Q_D(QGrpcCallOptions);
+    d->metadata = std::move(metadata);
     return *this;
 }
 
@@ -131,7 +141,8 @@ QGrpcCallOptions &QGrpcCallOptions::setMetadata(QGrpcMetadata &&metadata) noexce
 */
 std::optional<QGrpcDuration> QGrpcCallOptions::deadline() const noexcept
 {
-    return dPtr->deadline;
+    Q_D(const QGrpcCallOptions);
+    return d->deadline;
 }
 
 /*!
@@ -144,12 +155,16 @@ std::optional<QGrpcDuration> QGrpcCallOptions::deadline() const noexcept
 */
 const QGrpcMetadata &QGrpcCallOptions::metadata() const & noexcept
 {
-    return dPtr->metadata;
+    Q_D(const QGrpcCallOptions);
+    return d->metadata;
 }
 
-QGrpcMetadata QGrpcCallOptions::metadata() && noexcept
+QGrpcMetadata QGrpcCallOptions::metadata() &&
 {
-    return std::move(dPtr->metadata);
+    Q_D(QGrpcCallOptions);
+    if (d->ref.loadRelaxed() != 1) // return copy if shared
+        return { d->metadata };
+    return std::move(d->metadata);
 }
 
 #ifndef QT_NO_DEBUG_STREAM
@@ -160,9 +175,8 @@ QGrpcMetadata QGrpcCallOptions::metadata() && noexcept
 */
 QDebug operator<<(QDebug debug, const QGrpcCallOptions &callOpts)
 {
-    QDebugStateSaver save(debug);
-    debug.nospace();
-    debug.noquote();
+    const QDebugStateSaver save(debug);
+    debug.nospace().noquote();
     debug << "QGrpcCallOptions(deadline: " << callOpts.deadline()
           << ", metadata: " << callOpts.metadata() << ')';
     return debug;

src/grpc/qgrpccalloptions.h

@@ -7,15 +7,19 @@
 #include <QtGrpc/qgrpcdefs.h>
 #include <QtGrpc/qtgrpcglobal.h>
 
+#include <QtCore/qshareddata.h>
+#include <QtCore/qstringfwd.h>
 #include <QtCore/qtclasshelpermacros.h>
 
-#include <memory>
 #include <optional>
 
 QT_BEGIN_NAMESPACE
 
 class QDebug;
+class QVariant;
+
 class QGrpcCallOptionsPrivate;
+QT_DECLARE_QESDP_SPECIALIZATION_DTOR_WITH_EXPORT(QGrpcCallOptionsPrivate, Q_GRPC_EXPORT)
 
 class QGrpcCallOptions final
 {
@@ -27,26 +31,32 @@ public:
     Q_GRPC_EXPORT QGrpcCallOptions &operator=(const QGrpcCallOptions &other);
 
     QGrpcCallOptions(QGrpcCallOptions &&other) noexcept = default;
-    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QGrpcCallOptions)
+    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QGrpcCallOptions)
 
-    void swap(QGrpcCallOptions &other) noexcept { dPtr.swap(other.dPtr); }
+    Q_GRPC_EXPORT Q_IMPLICIT operator QVariant() const;
+
+    void swap(QGrpcCallOptions &other) noexcept { d_ptr.swap(other.d_ptr); }
 
     Q_GRPC_EXPORT QGrpcCallOptions &setDeadline(QGrpcDuration deadline);
     Q_GRPC_EXPORT QGrpcCallOptions &setMetadata(const QGrpcMetadata &metadata);
-    Q_GRPC_EXPORT QGrpcCallOptions &setMetadata(QGrpcMetadata &&metadata) noexcept;
+    Q_GRPC_EXPORT QGrpcCallOptions &setMetadata(QGrpcMetadata &&metadata);
 
     [[nodiscard]] Q_GRPC_EXPORT std::optional<QGrpcDuration> deadline() const noexcept;
     [[nodiscard]] Q_GRPC_EXPORT const QGrpcMetadata &metadata() const & noexcept;
-    [[nodiscard]] Q_GRPC_EXPORT QGrpcMetadata metadata() && noexcept;
+    [[nodiscard]] Q_GRPC_EXPORT QGrpcMetadata metadata() &&;
 
 private:
-    std::unique_ptr<QGrpcCallOptionsPrivate, void (*)(QGrpcCallOptionsPrivate *)> dPtr;
+    QExplicitlySharedDataPointer<QGrpcCallOptionsPrivate> d_ptr;
 
 #ifndef QT_NO_DEBUG_STREAM
     friend Q_GRPC_EXPORT QDebug operator<<(QDebug debug, const QGrpcCallOptions &callOpts);
 #endif
+
+    Q_DECLARE_PRIVATE(QGrpcCallOptions)
 };
 
+Q_DECLARE_SHARED(QGrpcCallOptions)
+
 QT_END_NAMESPACE
 
 #endif // QGRPCALLOPTIONS_H

tests/auto/grpc/CMakeLists.txt

@@ -10,4 +10,5 @@ if(TARGET WrapgRPC::WrapLibgRPC)
     add_subdirectory(qgrpchttp2channel)
     add_subdirectory(qgrpcserializationformat)
     add_subdirectory(qgrpcstatus)
+    add_subdirectory(qgrpccalloptions)
 endif()

tests/auto/grpc/qgrpccalloptions/CMakeLists.txt

@@ -0,0 +1,17 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+if(NOT QT_BUILD_STANDALONE_TESTS AND NOT QT_BUILDING_QT)
+    cmake_minimum_required(VERSION 3.16)
+    project(tst_qgrpccalloptions LANGUAGES CXX)
+    find_package(Qt6BuildInternals REQUIRED COMPONENTS STANDALONE_TEST)
+endif()
+
+qt_internal_add_test(tst_qgrpccalloptions
+    SOURCES
+        tst_qgrpccalloptions.cpp
+    LIBRARIES
+        Qt::Core
+        Qt::Test
+        Qt::Grpc
+)

tests/auto/grpc/qgrpccalloptions/tst_qgrpccalloptions.cpp

@@ -0,0 +1,129 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#include <QtGrpc/qgrpccalloptions.h>
+
+#include <QtTest/qtest.h>
+
+#include <cstring>
+
+using namespace std::chrono_literals;
+
+class QGrpcCallOptionsTest : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void hasSpecialMemberFunctions() const;
+    void hasImplicitQVariant() const;
+    void hasMemberSwap() const;
+    void propertyMetadata() const;
+    void propertyDeadline() const;
+    void streamsToDebug() const;
+};
+
+void QGrpcCallOptionsTest::hasSpecialMemberFunctions() const
+{
+    QGrpcCallOptions o1;
+    QVERIFY(!o1.deadline());
+    QVERIFY(o1.metadata().empty());
+
+    o1.setDeadline(100ms);
+
+    QGrpcCallOptions o2(o1);
+    QCOMPARE_EQ(o1.deadline(), o2.deadline());
+
+    QGrpcCallOptions o3 = o1;
+    QCOMPARE_EQ(o1.deadline(), o3.deadline());
+
+    QGrpcCallOptions o4(std::move(o1));
+    QCOMPARE_EQ(o4.deadline(), o2.deadline());
+
+    o1 = std::move(o4);
+    QCOMPARE_EQ(o1.deadline(), o2.deadline());
+}
+
+void QGrpcCallOptionsTest::hasImplicitQVariant() const
+{
+    QGrpcCallOptions o1;
+    o1.setDeadline(250ms);
+    o1.setMetadata({
+        { "keyA", "valA" },
+        { "keyB", "valB" },
+    });
+
+    QVariant v = o1;
+    QCOMPARE_EQ(v.metaType(), QMetaType::fromType<QGrpcCallOptions>());
+    const auto o2 = v.value<QGrpcCallOptions>();
+    QCOMPARE_EQ(o1.metadata(), o2.metadata());
+    QCOMPARE_EQ(o1.deadline(), o2.deadline());
+}
+
+void QGrpcCallOptionsTest::hasMemberSwap() const
+{
+    constexpr QGrpcDuration Dur = 50ms;
+
+    QGrpcCallOptions o1;
+    o1.setDeadline(Dur);
+    QGrpcCallOptions o2;
+
+    QCOMPARE_EQ(o1.deadline(), Dur);
+    QVERIFY(!o2.deadline());
+    o2.swap(o1);
+    QCOMPARE_EQ(o2.deadline(), Dur);
+    QVERIFY(!o1.deadline());
+    swap(o2, o1);
+    QCOMPARE_EQ(o1.deadline(), Dur);
+    QVERIFY(!o2.deadline());
+}
+
+void QGrpcCallOptionsTest::propertyMetadata() const
+{
+    QGrpcMetadata md = {
+        { "keyA", "valA" },
+        { "keyB", "valB" },
+    };
+
+    QGrpcCallOptions o1;
+    auto o1Detach = o1;
+    o1.setMetadata(md);
+    QCOMPARE_EQ(o1.metadata(), md);
+    QCOMPARE_NE(o1.metadata(), o1Detach.metadata());
+
+    QGrpcCallOptions o2;
+    auto o2Detach = o2;
+    o2.setMetadata(std::move(md));
+    QCOMPARE_EQ(o2.metadata(), o1.metadata());
+    QCOMPARE_NE(o2.metadata(), o2Detach.metadata());
+
+    QCOMPARE_EQ(std::move(o1).metadata(), o2.metadata());
+}
+
+void QGrpcCallOptionsTest::propertyDeadline() const
+{
+    constexpr QGrpcDuration Dur = 50ms;
+
+    QGrpcCallOptions o1;
+    auto o1Detach = o1;
+    o1.setDeadline(Dur);
+    QCOMPARE_EQ(o1.deadline(), Dur);
+    QCOMPARE_NE(o1.deadline(), o1Detach.deadline());
+}
+
+void QGrpcCallOptionsTest::streamsToDebug() const
+{
+    QGrpcCallOptions o;
+    QString storage;
+    QDebug dbg(&storage);
+    dbg.noquote().nospace();
+
+    dbg << o;
+    QVERIFY(!storage.isEmpty());
+
+    std::unique_ptr<char[]> ustr(QTest::toString(o));
+    QCOMPARE_EQ(storage, QString::fromUtf8(ustr.get()));
+}
+
+QTEST_MAIN(QGrpcCallOptionsTest)
+
+#include "tst_qgrpccalloptions.moc"