diff options
Diffstat (limited to 'src/corelib/tools/qarraydataops.h')
| -rw-r--r-- | src/corelib/tools/qarraydataops.h | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/src/corelib/tools/qarraydataops.h b/src/corelib/tools/qarraydataops.h index 3548424b53..c2414f22f2 100644 --- a/src/corelib/tools/qarraydataops.h +++ b/src/corelib/tools/qarraydataops.h @@ -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); - - 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)...); + 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); + + 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)...); } } |