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QMessageBox: use optional<> instead of unique_ptr

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... to hold the optional QApplication.

Saves a memory allocation, and is more readable.

Amends 408fbd3f2d7a6b87521f5b3c27ecf6341dc06e13.

Change-Id: I390b9cfa367d01feb59bb5deadc5383c8e678749
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
(cherry picked from commit 2389b93b7991e96dc189e44cf5ea7ca894224d30)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Marc Mutz 2023-06-21 07:44:10 +02:00 committed by Qt Cherry-pick Bot
parent 1c79aab50d
commit 11e0a4fc5e
1 changed files with 3 additions and 3 deletions
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6
src/widgets/dialogs/qmessagebox.cpp
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@ -39,7 +39,7 @@
#include <qpa/qplatformnativeinterface.h>
#endif
#include <memory>
#include <optional>
QT_BEGIN_NAMESPACE
@ -2853,9 +2853,9 @@ Q_WIDGETS_EXPORT void _q_requireVersion(int argc, char *argv[], QAnyStringView r
const auto current = QVersionNumber::fromString(qVersion()).normalized();
if (current >= required)
return;
std::unique_ptr<QApplication> application;
std::optional<QApplication> application;
if (!qApp)
application = std::make_unique<QApplication>(argc, argv);
application.emplace(argc, argv);
const QString message = QApplication::tr("Application \"%1\" requires Qt %2, found Qt %3.")
.arg(qAppName(), required.toString(), current.toString());
QMessageBox::critical(nullptr, QApplication::tr("Incompatible Qt Library Error"),