Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace, with manual
unstaging of the actual definition and documentation in dist/,
src/corelib/doc/ and src/corelib/global/.

Task-number: QTBUG-99313
Change-Id: I4c7114444a325ad4e62d0fcbfd347d2bbfb21541
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 5 insertions, 5 deletions

diff --git a/examples/widgets/painting/painterpaths/window.cpp b/examples/widgets/painting/painterpaths/window.cpp
index 4fc3e8efd9..01b62d6988 100644
--- a/examples/widgets/painting/painterpaths/window.cpp
+++ b/examples/widgets/painting/painterpaths/window.cpp
@@ -156,7 +156,7 @@ Window::Window()
     connect(penColorComboBox, &QComboBox::activated,
             this, &Window::penColorChanged);
 
-    for (RenderArea *area : qAsConst(renderAreas)) {
+    for (RenderArea *area : std::as_const(renderAreas)) {
         connect(penWidthSpinBox, &QSpinBox::valueChanged,
                 area, &RenderArea::setPenWidth);
         connect(rotationAngleSpinBox, &QSpinBox::valueChanged,
@@ -167,7 +167,7 @@ Window::Window()
     QGridLayout *topLayout = new QGridLayout;
 
     int i = 0;
-    for (RenderArea *area : qAsConst(renderAreas)) {
+    for (RenderArea *area : std::as_const(renderAreas)) {
         topLayout->addWidget(area, i / 3, i % 3);
         ++i;
     }
@@ -204,7 +204,7 @@ void Window::fillRuleChanged()
 {
     Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();
 
-    for (RenderArea *area : qAsConst(renderAreas))
+    for (RenderArea *area : std::as_const(renderAreas))
         area->setFillRule(rule);
 }
 //! [19]
@@ -215,7 +215,7 @@ void Window::fillGradientChanged()
     QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
     QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));
 
-    for (RenderArea *area : qAsConst(renderAreas))
+    for (RenderArea *area : std::as_const(renderAreas))
         area->setFillGradient(color1, color2);
 }
 //! [20]
@@ -225,7 +225,7 @@ void Window::penColorChanged()
 {
     QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));
 
-    for (RenderArea *area : qAsConst(renderAreas))
+    for (RenderArea *area : std::as_const(renderAreas))
         area->setPenColor(color);
 }
 //! [21]