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QByteArray: optimize replace(char, char)

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Write every byte only once.

Amends 83c2c5055405f09043c35b93cd5ba9b9969f3174 (as well as the start
of the public history).

Pick-to: 6.8
Task-number: QTBUG-106185
Change-Id: I883b2f00c754806882131a09dc3cbc5613420151
Reviewed-by: Anton Kudryavtsev <antkudr@mail.ru>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
(cherry picked from commit 2753924fcbeb29fa5b34782bd6ad6ed4fe4b51f1)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Marc Mutz 2025-02-13 16:09:20 +01:00 committed by Qt Cherry-pick Bot
parent 0d36941a78
commit a5bafadf8e
1 changed files with 12 additions and 2 deletions
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14
src/corelib/text/qbytearray.cpp
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@ -2626,8 +2626,18 @@ QByteArray &QByteArray::replace(char before, char after)
{
if (before != after) {
if (const auto pos = indexOf(before); pos >= 0) {
const auto detachedData = data();
std::replace(detachedData + pos, detachedData + size(), before, after);
if (d.needsDetach()) {
QByteArray tmp(size(), Qt::Uninitialized);
auto dst = tmp.d.data();
dst = std::copy(d.data(), d.data() + pos, dst);
*dst++ = after;
std::replace_copy(d.data() + pos + 1, d.end(), dst, before, after);
swap(tmp);
} else {
// in-place
d.data()[pos] = after;
std::replace(d.data() + pos + 1, d.end(), before, after);
}
}
}
return *this;