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Remove QUuid(quint128) constructor again

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This constructor matches way too many argument types (integral,
unscoped enums, FP types), so it's likely to cause mayhem, even if
left in as an explicit constructor.

We now have a named constructor for the same functionality, so just
drop the "unnamed" constructor.

"Unnamed" constructors are important when emplacement is more
efficient than construction + move, or when implicit conversion is
required.  Neither is the case here: The named as well as the
"unnamed" constructors just copy ten bytes around, and the compiler
can optimize those extra copies away just fine.

Found in API review.

Pick-to: 6.6
Change-Id: I7faafd3ebf522fb2b0e450112fb95d643fece5ce
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
This commit is contained in:
Marc Mutz 2023-08-10 16:03:46 +02:00 committed by Thiago Macieira
parent 3693dd74fe
commit 9c1d20337a
3 changed files with 14 additions and 28 deletions
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13
src/corelib/plugin/quuid.cpp
View File

@ -310,19 +310,6 @@ static QUuid createFromName(const QUuid &ns, const QByteArray &baseData, QCrypto
\sa fromBytes(), toBytes(), toRfc4122(), toUInt128()
*/
/*!
\fn QUuid::QUuid(quint128 uuid, QSysInfo::Endian order) noexcept
\since 6.6
Creates a QUuid based on the integral \a uuid parameter and respecting the
byte order \a order.
\note This function is only present on platforms that offer a 128-bit
integer type.
\sa toUInt128(), fromUInt128(), fromBytes(), toBytes(), toRfc4122()
*/
/*!
\fn QUuid::fromUInt128(quint128 uuid, QSysInfo::Endian order) noexcept
\since 6.6

25
src/corelib/plugin/quuid.h
View File

@ -101,9 +101,7 @@ public:
bool isNull() const noexcept;
#ifdef QT_SUPPORTS_INT128
constexpr explicit QUuid(quint128 uuid, QSysInfo::Endian order = QSysInfo::BigEndian) noexcept;
static constexpr QUuid fromUInt128(quint128 uuid, QSysInfo::Endian order = QSysInfo::BigEndian) noexcept
{ return QUuid{uuid, order}; }
static constexpr QUuid fromUInt128(quint128 uuid, QSysInfo::Endian order = QSysInfo::BigEndian) noexcept;
constexpr quint128 toUInt128(QSysInfo::Endian order = QSysInfo::BigEndian) const noexcept;
#endif
@ -245,22 +243,23 @@ inline QUuid QUuid::fromBytes(const void *bytes, QSysInfo::Endian order) noexcep
}
#ifdef QT_SUPPORTS_INT128
constexpr QUuid::QUuid(quint128 uuid, QSysInfo::Endian order) noexcept
: QUuid()
constexpr QUuid QUuid::fromUInt128(quint128 uuid, QSysInfo::Endian order) noexcept
{
QUuid result = {};
if (order == QSysInfo::BigEndian) {
data1 = qFromBigEndian<quint32>(int(uuid));
data2 = qFromBigEndian<quint16>(ushort(uuid >> 32));
data3 = qFromBigEndian<quint16>(ushort(uuid >> 48));
result.data1 = qFromBigEndian<quint32>(int(uuid));
result.data2 = qFromBigEndian<quint16>(ushort(uuid >> 32));
result.data3 = qFromBigEndian<quint16>(ushort(uuid >> 48));
for (int i = 0; i < 8; ++i)
data4[i] = uchar(uuid >> (64 + i * 8));
result.data4[i] = uchar(uuid >> (64 + i * 8));
} else {
data1 = qFromLittleEndian<quint32>(uint(uuid >> 96));
data2 = qFromLittleEndian<quint16>(ushort(uuid >> 80));
data3 = qFromLittleEndian<quint16>(ushort(uuid >> 64));
result.data1 = qFromLittleEndian<quint32>(uint(uuid >> 96));
result.data2 = qFromLittleEndian<quint16>(ushort(uuid >> 80));
result.data3 = qFromLittleEndian<quint16>(ushort(uuid >> 64));
for (int i = 0; i < 8; ++i)
data4[i] = uchar(uuid >> (56 - i * 8));
result.data4[i] = uchar(uuid >> (56 - i * 8));
}
return result;
}
constexpr quint128 QUuid::toUInt128(QSysInfo::Endian order) const noexcept

4
tests/auto/corelib/plugin/quuid/tst_quuid.cpp
View File

@ -252,7 +252,7 @@ void tst_QUuid::uint128()
constexpr quint128 u = quint128(Q_UINT64_C(0xfc69b59ecc344436)) << 64
| Q_UINT64_C(0xa43cee95d128b8c5); // This is LE
constexpr quint128 be = qToBigEndian(u);
constexpr QUuid uuid(be);
constexpr QUuid uuid = QUuid::fromUInt128(be);
static_assert(uuid.toUInt128() == be, "Round-trip through QUuid failed");
QCOMPARE(uuid, uuidA);
@ -262,7 +262,7 @@ void tst_QUuid::uint128()
quint128 le = qFromBigEndian(be);
QCOMPARE(quint64(uuid.toUInt128(QSysInfo::LittleEndian) >> 64), quint64(le >> 64));
QCOMPARE(quint64(uuid.toUInt128(QSysInfo::LittleEndian)), quint64(le));
QCOMPARE(QUuid(le, QSysInfo::LittleEndian), uuidA);
QCOMPARE(QUuid::fromUInt128(le, QSysInfo::LittleEndian), uuidA);
QUuid::Id128Bytes bytes = { .data128 = { qToBigEndian(u) } };
QUuid uuid2(bytes);