diff options
author | Ahmad Samir <a.samirh78@gmail.com> | 2022-12-11 15:35:34 +0200 |
---|---|---|
committer | Ahmad Samir <a.samirh78@gmail.com> | 2023-02-09 16:50:02 +0200 |
commit | 3a3b76e040ec800e1f3214803c051afacfdb0f7b (patch) | |
tree | 874ed7dd87a00feab96c301228a2ade0ef3284c2 /src/corelib/text | |
parent | 5f73f485563719e133c849c8dbd93877095d5ff5 (diff) |
QString: don't detach in insert(qsizetype, QUtf8StringView)
If the string is shared, instead of detaching (which would copy the
whole string data before doing the insertion), create a new string and
copy characters to it as needed then swap it with "this".
[ChangeLog][QtCore][QString] Inserting Utf8 data (e.g. a
QUtf8StringView) into a currently shared QString is now done more
efficiently.
Task-number: QTBUG-106186
Change-Id: I832bde1494108685cc2f630750dfe9b38cd96931
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/text')
-rw-r--r-- | src/corelib/text/qstring.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp index b6c36e1b2f..e0415d65e0 100644 --- a/src/corelib/text/qstring.cpp +++ b/src/corelib/text/qstring.cpp @@ -3031,6 +3031,22 @@ QString &QString::insert(qsizetype i, QUtf8StringView s) if (Q_UNLIKELY(i > d.size)) difference = i - d.size; + const qsizetype newSize = d.size + difference + insert_size; + + if (d.needsDetach() || needsReallocate(*this, newSize)) { + const auto cbegin = this->cbegin(); + const auto insert_start = difference == 0 ? std::next(cbegin, i) : cend(); + QString other; + other.reserve(newSize); + other.append(QStringView(cbegin, insert_start)); + if (difference > 0) + other.resize(i, u' '); + other.append(s); + other.append(QStringView(insert_start, cend())); + swap(other); + return *this; + } + if (i >= d.size) { d.detachAndGrow(QArrayData::GrowsAtEnd, difference + insert_size, nullptr, nullptr); Q_CHECK_PTR(d.data()); |