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Simplify the code for QList::emplace()

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Unify it with the code in QArrayDataOps and only have one
emplace method there that handles it all.

Adjust autotests to API changes in QArrayDataOps and fix a
wrong test case (that just happened to pass by chance before).

Change-Id: Ia08cadebe2f74b82c31f856b1ff8a3d8dc400a3c
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Lars Knoll 2020-11-06 15:57:03 +01:00
parent ee122077b0
commit fc172c4313
4 changed files with 31 additions and 48 deletions
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32
src/corelib/tools/qarraydataops.h
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@ -1345,22 +1345,28 @@ public:
}
template<typename... Args>
void emplace(T *where, Args &&... args)
void emplace(qsizetype i, Args &&... args)
{
Q_ASSERT(!this->isShared());
Q_ASSERT(where >= this->begin() && where <= this->end());
Q_ASSERT(this->allocatedCapacity() - this->size >= 1);
typename QArrayData::GrowthPosition pos = QArrayData::GrowsAtEnd;
if (this->size != 0 && i <= (this->size >> 1))
pos = QArrayData::GrowsAtBeginning;
if (this->needsDetach() ||
(pos == QArrayData::GrowsAtBeginning && !this->freeSpaceAtBegin()) ||
(pos == QArrayData::GrowsAtEnd && !this->freeSpaceAtEnd())) {
T tmp(std::forward<Args>(args)...);
this->reallocateAndGrow(pos, 1);
const T *begin = this->begin();
const T *end = this->end();
// Qt5 QList in insert(1): try to move less data around
// Now:
const bool shouldInsertAtBegin =
(where - begin) < (end - where) || this->freeSpaceAtEnd() <= 0;
if (this->freeSpaceAtBegin() > 0 && shouldInsertAtBegin) {
Base::emplace(GrowsBackwardsTag{}, where, std::forward<Args>(args)...);
T *where = this->begin() + i;
if (pos == QArrayData::GrowsAtBeginning)
Base::emplace(GrowsBackwardsTag{}, where, std::move(tmp));
else
Base::emplace(GrowsForwardTag{}, where, std::move(tmp));
} else {
Base::emplace(GrowsForwardTag{}, where, std::forward<Args>(args)...);
T *where = this->begin() + i;
if (pos == QArrayData::GrowsAtBeginning)
Base::emplace(GrowsBackwardsTag{}, where, std::forward<Args>(args)...);
else
Base::emplace(GrowsForwardTag{}, where, std::forward<Args>(args)...);
}
}

20
src/corelib/tools/qlist.h
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@ -743,25 +743,7 @@ typename QList<T>::iterator
QList<T>::emplace(qsizetype i, Args&&... args)
{
Q_ASSERT_X(i >= 0 && i <= d->size, "QList<T>::insert", "index out of range");
if (d->needsDetach() || (d.size == d.constAllocatedCapacity())) {
typename QArrayData::GrowthPosition pos = QArrayData::GrowsAtEnd;
if (d.size != 0 && i <= (d.size >> 1))
pos = QArrayData::GrowsAtBeginning;
DataPointer detached(DataPointer::allocateGrow(d, 1, pos));
const_iterator where = constBegin() + i;
// protect against args being an element of the container
T tmp(std::forward<Args>(args)...);
detached->copyAppend(constBegin(), where);
detached->emplace(detached.end(), std::move(tmp));
detached->copyAppend(where, constEnd());
d.swap(detached);
} else {
d->emplace(d.begin() + i, std::forward<Args>(args)...);
}
d->emplace(i, std::forward<Args>(args)...);
return d.begin() + i;
}

11
tests/auto/corelib/tools/qarraydata/simplevector.h
View File

@ -216,15 +216,10 @@ public:
auto requiredSize = qsizetype(last - first);
if (d->needsDetach() || d.freeSpaceAtEnd() < requiredSize) {
SimpleVector detached(DataPointer::allocateGrow(d, requiredSize, QArrayData::GrowsAtEnd));
if (d->size) {
const T *const begin = constBegin();
detached.d->copyAppend(begin, begin + d->size);
}
detached.d->copyAppend(first, last);
detached.swap(*this);
DataPointer oldData;
d.reallocateAndGrow(QArrayData::GrowsAtEnd, requiredSize, &oldData);
d->copyAppend(first, last);
return;
}

16
tests/auto/corelib/tools/qarraydata/tst_qarraydata.cpp
View File

@ -1632,7 +1632,7 @@ void tst_QArrayData::arrayOpsExtra()
const size_t originalSize = dataPointer.size;
auto copy = cloneArrayDataPointer(dataPointer, dataPointer.size);
dataPointer->emplace(dataPointer.begin() + pos, value);
dataPointer->emplace(pos, value);
QCOMPARE(size_t(dataPointer.size), originalSize + 1);
size_t i = 0;
for (; i < pos; ++i)
@ -2136,7 +2136,7 @@ struct MyQStringWrapper : public QString
bool movedFrom = false;
MyQStringWrapper() = default;
MyQStringWrapper(QChar c) : QString(c) { }
MyQStringWrapper(MyQStringWrapper &&other) : QString(std::move(static_cast<QString>(other)))
MyQStringWrapper(MyQStringWrapper &&other) : QString(std::move(static_cast<QString &>(other)))
{
movedTo = true;
movedFrom = other.movedFrom;
@ -2144,7 +2144,7 @@ struct MyQStringWrapper : public QString
}
MyQStringWrapper &operator=(MyQStringWrapper &&other)
{
QString::operator=(std::move(static_cast<QString>(other)));
QString::operator=(std::move(static_cast<QString &>(other)));
movedTo = true;
movedFrom = other.movedFrom;
other.movedFrom = true;
@ -2216,13 +2216,13 @@ void tst_QArrayData::selfEmplaceBackwards()
QVERIFY(!adp.freeSpaceAtEnd());
QVERIFY(adp.freeSpaceAtBegin());
adp->emplace(adp.end(), adp.data()[0]);
adp->emplace(adp.size, adp.data()[0]);
for (qsizetype i = 0; i < adp.size - 1; ++i) {
QCOMPARE(adp.data()[i], initValues[i]);
}
QCOMPARE(adp.data()[adp.size - 1], initValues[0]);
adp->emplace(adp.end(), std::move(adp.data()[0]));
adp->emplace(adp.size, std::move(adp.data()[0]));
for (qsizetype i = 1; i < adp.size - 2; ++i) {
QCOMPARE(adp.data()[i], initValues[i]);
}
@ -2259,14 +2259,14 @@ void tst_QArrayData::selfEmplaceForward()
QVERIFY(!adp.freeSpaceAtBegin());
QVERIFY(adp.freeSpaceAtEnd());
adp->emplace(adp.begin(), adp.data()[adp.size - 1]);
adp->emplace(0, adp.data()[adp.size - 1]);
for (qsizetype i = 1; i < adp.size; ++i) {
QCOMPARE(adp.data()[i], initValues[i - 1]);
}
QCOMPARE(adp.data()[0], initValues[spaceAtBegin - 1]);
adp->emplace(adp.begin(), std::move(adp.data()[adp.size - 1]));
for (qsizetype i = 2; i < adp.size; ++i) {
adp->emplace(0, std::move(adp.data()[adp.size - 1]));
for (qsizetype i = 2; i < adp.size - 1; ++i) {
QCOMPARE(adp.data()[i], initValues[i - 2]);
}
QCOMPARE(adp.data()[1], initValues[spaceAtBegin - 1]);