examples: Use QOverload to select overloaded signals and slots

We can use QOverload since Qt 5.7 (it depends on Q_COMPILER_VARIADIC_TEMPLATES
which is required since Qt 5.7).
Use it in the examples to show the best practice.
qOverload currently can't be used because it requires c++14.

Change-Id: I94a3c0db9d551fe169fa3d19c07ec0b329d5946c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

3 files changed, 6 insertions, 8 deletions

diff --git a/examples/widgets/tools/codecs/previewform.cpp b/examples/widgets/tools/codecs/previewform.cpp
index e5ca13f011..d19b9c0833 100644
--- a/examples/widgets/tools/codecs/previewform.cpp
+++ b/examples/widgets/tools/codecs/previewform.cpp
@@ -159,8 +159,7 @@ PreviewForm::PreviewForm(QWidget *parent)
         new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
     okButton = buttonBox->button(QDialogButtonBox::Ok);
 
-    typedef void(QComboBox::*ComboBoxIntSignal)(int);
-    connect(encodingComboBox, static_cast<ComboBoxIntSignal>(&QComboBox::activated),
+    connect(encodingComboBox, QOverload<int>::of(&QComboBox::activated),
             this, &PreviewForm::updateTextEdit);
     connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
diff --git a/examples/widgets/tools/regularexpression/regularexpressiondialog.cpp b/examples/widgets/tools/regularexpression/regularexpressiondialog.cpp
index f13240d06f..7a67c763d8 100644
--- a/examples/widgets/tools/regularexpression/regularexpressiondialog.cpp
+++ b/examples/widgets/tools/regularexpression/regularexpressiondialog.cpp
@@ -94,10 +94,10 @@ RegularExpressionDialog::RegularExpressionDialog(QWidget *parent)
     connect(optimizeOnFirstUsageOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
     connect(dontAutomaticallyOptimizeOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
 
-    connect(offsetSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
+    connect(offsetSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
             this, &RegularExpressionDialog::refresh);
 
-    connect(matchTypeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+    connect(matchTypeComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged),
             this, &RegularExpressionDialog::refresh);
 
     connect(anchoredMatchOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
diff --git a/examples/widgets/tools/settingseditor/locationdialog.cpp b/examples/widgets/tools/settingseditor/locationdialog.cpp
index 4aa1e6073f..5b6e2652bb 100644
--- a/examples/widgets/tools/settingseditor/locationdialog.cpp
+++ b/examples/widgets/tools/settingseditor/locationdialog.cpp
@@ -106,10 +106,9 @@ LocationDialog::LocationDialog(QWidget *parent)
 
     buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
 
-    typedef void (QComboBox::*QComboIntSignal)(int);
-    connect(formatComboBox, static_cast<QComboIntSignal>(&QComboBox::activated),
+    connect(formatComboBox, QOverload<int>::of(&QComboBox::activated),
             this, &LocationDialog::updateLocationsTable);
-    connect(scopeComboBox, static_cast<QComboIntSignal>(&QComboBox::activated),
+    connect(scopeComboBox, QOverload<int>::of(&QComboBox::activated),
             this, &LocationDialog::updateLocationsTable);
     connect(organizationComboBox->lineEdit(),
             &QLineEdit::editingFinished,
@@ -117,7 +116,7 @@ LocationDialog::LocationDialog(QWidget *parent)
     connect(applicationComboBox->lineEdit(),
             &QLineEdit::editingFinished,
             this, &LocationDialog::updateLocationsTable);
-    connect(applicationComboBox, static_cast<QComboIntSignal>(&QComboBox::activated),
+    connect(applicationComboBox, QOverload<int>::of(&QComboBox::activated),
             this, &LocationDialog::updateLocationsTable);
     connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);