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QFileSystemEngine: port a local QSet to QDuplicateTracker

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Apart from a more fitting, minimal, API, QDuplicateTracker also
transparently uses C++17 pmr::monotonic_buffer_resource to avoid, or
at least reduce, memory allocations.

Change-Id: Ife8e09b4a54060ef52c9aac43e400736ea398c29
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2020-05-02 23:03:39 +02:00
parent 7f02abd301
commit ea7d85457d
1 changed files with 4 additions and 4 deletions
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8
src/corelib/io/qfilesystemengine.cpp
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@ -45,6 +45,7 @@
#ifdef QT_BUILD_CORE_LIB
#include <QtCore/private/qresource_p.h>
#endif
#include <QtCore/private/qduplicatetracker_p.h>
QT_BEGIN_NAMESPACE
@ -64,9 +65,9 @@ QString QFileSystemEngine::slowCanonicalized(const QString &path)
QString tmpPath = path;
int separatorPos = 0;
QSet<QString> nonSymlinks;
QSet<QString> known;
QDuplicateTracker<QString> known;
known.insert(path);
(void)known.hasSeen(path);
do {
#ifdef Q_OS_WIN
if (separatorPos == 0) {
@ -94,9 +95,8 @@ QString QFileSystemEngine::slowCanonicalized(const QString &path)
tmpPath = QDir::cleanPath(target);
separatorPos = 0;
if (known.contains(tmpPath))
if (known.hasSeen(tmpPath))
return QString();
known.insert(tmpPath);
} else {
nonSymlinks.insert(prefix);
}