diff --git a/src/libs/3rdparty/modeling/qmt/controller/namecontroller.h b/src/libs/3rdparty/modeling/qmt/controller/namecontroller.h
index 3a792d7a287..336a4e18683 100644
--- a/src/libs/3rdparty/modeling/qmt/controller/namecontroller.h
+++ b/src/libs/3rdparty/modeling/qmt/controller/namecontroller.h
@@ -44,7 +44,7 @@ class QMT_EXPORT NameController : public QObject
     Q_OBJECT
 
 private:
-    NameController(QObject *parent = 0);
+    explicit NameController(QObject *parent = 0);
     ~NameController() override;
 
 public:
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_controller/dflatassignmentvisitor.h b/src/libs/3rdparty/modeling/qmt/diagram_controller/dflatassignmentvisitor.h
index a60a2678993..0eb1b218a68 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_controller/dflatassignmentvisitor.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_controller/dflatassignmentvisitor.h
@@ -39,7 +39,7 @@ namespace qmt {
 class QMT_EXPORT DFlatAssignmentVisitor : public DConstVisitor
 {
 public:
-    DFlatAssignmentVisitor(DElement *target);
+    explicit DFlatAssignmentVisitor(DElement *target);
 
     void visitDElement(const DElement *element) override;
     void visitDObject(const DObject *object) override;
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramgraphicsscene.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramgraphicsscene.h
index e48b05e0d2d..364c2d66a38 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramgraphicsscene.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramgraphicsscene.h
@@ -43,7 +43,7 @@ class QMT_EXPORT DiagramGraphicsScene : public QGraphicsScene
     Q_OBJECT
 
 public:
-    DiagramGraphicsScene(DiagramSceneModel *diagramSceneModel, QObject *parent = 0);
+    explicit DiagramGraphicsScene(DiagramSceneModel *diagramSceneModel, QObject *parent = 0);
     ~DiagramGraphicsScene() override;
 
 signals:
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodel.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodel.h
index 627ecfb187a..74e8e8da606 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodel.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodel.h
@@ -78,7 +78,7 @@ public:
         CollidingOuterItems
     };
 
-    DiagramSceneModel(QObject *parent = 0);
+    explicit DiagramSceneModel(QObject *parent = 0);
     ~DiagramSceneModel() override;
 
 signals:
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodelitemvisitors.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodelitemvisitors.h
index c402e796108..5eeb7d81308 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodelitemvisitors.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/diagramscenemodelitemvisitors.h
@@ -40,7 +40,7 @@ namespace qmt {
 class QMT_EXPORT DiagramSceneModel::CreationVisitor : public DVisitor
 {
 public:
-    CreationVisitor(DiagramSceneModel *diagramSceneModel);
+    explicit CreationVisitor(DiagramSceneModel *diagramSceneModel);
 
     QGraphicsItem *createdGraphicsItem() const { return m_graphicsItem; }
 
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/latchcontroller.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/latchcontroller.h
index 364aca085c7..cd22e660d8c 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/latchcontroller.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/latchcontroller.h
@@ -52,7 +52,7 @@ class QMT_EXPORT LatchController : public QObject
     Q_OBJECT
 
 public:
-    LatchController(QObject *parent = 0);
+    explicit LatchController(QObject *parent = 0);
     ~LatchController() override;
 
     void setDiagramSceneModel(DiagramSceneModel *diagramSceneModel);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignbuttonsitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignbuttonsitem.h
index cc92399ba58..5f80a32233f 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignbuttonsitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignbuttonsitem.h
@@ -54,7 +54,7 @@ public:
         VerticalDistanceToObejct = HorizontalDistanceToObject
     };
 
-    AlignButtonsItem(IAlignable *alignable, QGraphicsItem *parent = 0);
+    explicit AlignButtonsItem(IAlignable *alignable, QGraphicsItem *parent = 0);
     ~AlignButtonsItem() override;
 
     QRectF boundingRect() const override;
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignlineitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignlineitem.h
index 8677e4b0e51..12cf8b4e049 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignlineitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/alignlineitem.h
@@ -43,7 +43,7 @@ public:
         Vertical
     };
 
-    AlignLineItem(Direction direction, QGraphicsItem *parent = 0);
+    explicit AlignLineItem(Direction direction, QGraphicsItem *parent = 0);
     ~AlignLineItem() override;
 
     void setLine(qreal pos);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/arrowitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/arrowitem.h
index 53b6353f8d1..843191e3ce7 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/arrowitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/arrowitem.h
@@ -64,8 +64,8 @@ public:
         HeadFilledDiamondFilledTriangle
     };
 
-    ArrowItem(QGraphicsItem *parent = 0);
-    ArrowItem(const ArrowItem &rhs, QGraphicsItem *parent = 0);
+    explicit ArrowItem(QGraphicsItem *parent = 0);
+    explicit ArrowItem(const ArrowItem &rhs, QGraphicsItem *parent = 0);
     ~ArrowItem() override;
 
     void setShaft(Shaft shaft);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/contextlabelitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/contextlabelitem.h
index 2177eb97a4b..5de106bb100 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/contextlabelitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/contextlabelitem.h
@@ -38,7 +38,7 @@ namespace qmt {
 class ContextLabelItem : public QGraphicsSimpleTextItem
 {
 public:
-    ContextLabelItem(QGraphicsItem *parent = 0);
+    explicit ContextLabelItem(QGraphicsItem *parent = 0);
     ~ContextLabelItem() override;
 
     void setMaxWidth(double maxWidth);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/customiconitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/customiconitem.h
index 07f54b2b5d2..3caad04d38b 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/customiconitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/customiconitem.h
@@ -46,7 +46,7 @@ class DiagramSceneModel;
 class CustomIconItem : public QGraphicsItem
 {
 public:
-    CustomIconItem(DiagramSceneModel *diagramSceneModel, QGraphicsItem *parent = 0);
+    explicit CustomIconItem(DiagramSceneModel *diagramSceneModel, QGraphicsItem *parent = 0);
     ~CustomIconItem() override;
 
     void setStereotypeIconId(const QString &stereotypeIconId);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/pathselectionitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/pathselectionitem.h
index c6591ede290..535f91256e8 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/pathselectionitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/pathselectionitem.h
@@ -55,7 +55,7 @@ class PathSelectionItem : public QGraphicsItem
     };
 
 public:
-    PathSelectionItem(IWindable *windable, QGraphicsItem *parent = 0);
+    explicit PathSelectionItem(IWindable *windable, QGraphicsItem *parent = 0);
     ~PathSelectionItem() override;
 
     QRectF boundingRect() const override;
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/rectangularselectionitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/rectangularselectionitem.h
index 8b59b95ded2..e4c104cd353 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/rectangularselectionitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/rectangularselectionitem.h
@@ -80,7 +80,7 @@ public:
         FreedomKeepRatio
     };
 
-    RectangularSelectionItem(IResizable *itemResizer, QGraphicsItem *parent = 0);
+    explicit RectangularSelectionItem(IResizable *itemResizer, QGraphicsItem *parent = 0);
     ~RectangularSelectionItem() override;
 
     QRectF boundingRect() const override;
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/stereotypesitem.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/stereotypesitem.h
index 4b2e3d58afc..a1254f4c127 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/stereotypesitem.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/stereotypesitem.h
@@ -39,7 +39,7 @@ namespace qmt {
 class StereotypesItem : public QGraphicsSimpleTextItem
 {
 public:
-    StereotypesItem(QGraphicsItem *parent = 0);
+    explicit StereotypesItem(QGraphicsItem *parent = 0);
     ~StereotypesItem() override;
 
     void setStereotypes(const QList<QString> &stereotypes);
diff --git a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/templateparameterbox.h b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/templateparameterbox.h
index e5d1b88c0e7..276f043c195 100644
--- a/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/templateparameterbox.h
+++ b/src/libs/3rdparty/modeling/qmt/diagram_scene/parts/templateparameterbox.h
@@ -38,7 +38,7 @@ namespace qmt {
 class TemplateParameterBox : public QGraphicsRectItem
 {
 public:
-    TemplateParameterBox(QGraphicsItem *parent = 0);
+    explicit TemplateParameterBox(QGraphicsItem *parent = 0);
     ~TemplateParameterBox() override;
 
     void setFont(const QFont &font);
diff --git a/src/libs/3rdparty/modeling/qmt/infrastructure/exceptions.h b/src/libs/3rdparty/modeling/qmt/infrastructure/exceptions.h
index 9bb7ac2df18..1389b69eb9b 100644
--- a/src/libs/3rdparty/modeling/qmt/infrastructure/exceptions.h
+++ b/src/libs/3rdparty/modeling/qmt/infrastructure/exceptions.h
@@ -40,7 +40,7 @@ namespace qmt {
 class QMT_EXPORT Exception
 {
 public:
-    Exception(const QString &errorMessage);
+    explicit Exception(const QString &errorMessage);
     virtual ~Exception() = default;
 
     QString errorMessage() const { return m_errorMessage; }
diff --git a/src/libs/3rdparty/modeling/qmt/infrastructure/ioexceptions.h b/src/libs/3rdparty/modeling/qmt/infrastructure/ioexceptions.h
index d40e741c306..e117cc9a888 100644
--- a/src/libs/3rdparty/modeling/qmt/infrastructure/ioexceptions.h
+++ b/src/libs/3rdparty/modeling/qmt/infrastructure/ioexceptions.h
@@ -82,7 +82,7 @@ public:
 class IllegalXmlFile : public FileIOException
 {
 public:
-    IllegalXmlFile(const QString &fileName, int lineNumber = -1);
+    explicit IllegalXmlFile(const QString &fileName, int lineNumber = -1);
 };
 
 class UnknownFileVersion : public FileIOException
diff --git a/src/libs/3rdparty/modeling/qmt/model/mclassmember.h b/src/libs/3rdparty/modeling/qmt/model/mclassmember.h
index 7e86c2c531a..26597122eac 100644
--- a/src/libs/3rdparty/modeling/qmt/model/mclassmember.h
+++ b/src/libs/3rdparty/modeling/qmt/model/mclassmember.h
@@ -72,7 +72,7 @@ public:
 
     Q_DECLARE_FLAGS(Properties, Property)
 
-    MClassMember(MemberType memberType = MemberUndefined);
+    explicit MClassMember(MemberType memberType = MemberUndefined);
     MClassMember(const MClassMember &rhs);
     ~MClassMember();
 
diff --git a/src/libs/3rdparty/modeling/qmt/model_controller/mflatassignmentvisitor.h b/src/libs/3rdparty/modeling/qmt/model_controller/mflatassignmentvisitor.h
index aad7b5b152d..39190e19c49 100644
--- a/src/libs/3rdparty/modeling/qmt/model_controller/mflatassignmentvisitor.h
+++ b/src/libs/3rdparty/modeling/qmt/model_controller/mflatassignmentvisitor.h
@@ -41,7 +41,7 @@ class MAssociationEnd;
 class QMT_EXPORT MFlatAssignmentVisitor : public MConstVisitor
 {
 public:
-    MFlatAssignmentVisitor(MElement *target);
+    explicit MFlatAssignmentVisitor(MElement *target);
 
     void visitMElement(const MElement *element) override;
     void visitMObject(const MObject *object) override;
diff --git a/src/libs/3rdparty/modeling/qmt/model_widgets_ui/propertiesviewmview.h b/src/libs/3rdparty/modeling/qmt/model_widgets_ui/propertiesviewmview.h
index 7031e90aae2..12ec141e1fd 100644
--- a/src/libs/3rdparty/modeling/qmt/model_widgets_ui/propertiesviewmview.h
+++ b/src/libs/3rdparty/modeling/qmt/model_widgets_ui/propertiesviewmview.h
@@ -66,7 +66,7 @@ class QMT_EXPORT PropertiesView::MView : public QObject, public MConstVisitor, p
     Q_OBJECT
 
 public:
-    MView(PropertiesView *propertiesView);
+    explicit MView(PropertiesView *propertiesView);
     ~MView() override;
 
     QWidget *topLevelWidget() const { return m_topWidget; }
diff --git a/src/libs/3rdparty/modeling/qmt/stereotype/shapevalue.h b/src/libs/3rdparty/modeling/qmt/stereotype/shapevalue.h
index b8443ee1c0f..f4710662cb8 100644
--- a/src/libs/3rdparty/modeling/qmt/stereotype/shapevalue.h
+++ b/src/libs/3rdparty/modeling/qmt/stereotype/shapevalue.h
@@ -66,7 +66,7 @@ public:
     {
     }
 
-    ShapeValueF(qreal value, Unit unit = UnitRelative, Origin origin = OriginSmart)
+    explicit ShapeValueF(qreal value, Unit unit = UnitRelative, Origin origin = OriginSmart)
         : m_value(value),
           m_unit(unit),
           m_origin(origin)
diff --git a/src/libs/3rdparty/modeling/qmt/tasks/diagramscenecontroller.h b/src/libs/3rdparty/modeling/qmt/tasks/diagramscenecontroller.h
index 2ffd74c006e..6956b4e1c4c 100644
--- a/src/libs/3rdparty/modeling/qmt/tasks/diagramscenecontroller.h
+++ b/src/libs/3rdparty/modeling/qmt/tasks/diagramscenecontroller.h
@@ -60,7 +60,7 @@ class QMT_EXPORT DiagramSceneController : public QObject
     Q_OBJECT
 
 public:
-    DiagramSceneController(QObject *parent = 0);
+    explicit DiagramSceneController(QObject *parent = 0);
     ~DiagramSceneController() override;
 
 signals:
diff --git a/src/libs/3rdparty/modeling/qstringparser/qstringparser.h b/src/libs/3rdparty/modeling/qstringparser/qstringparser.h
index 223b6c2cae9..e8a5ccbd567 100644
--- a/src/libs/3rdparty/modeling/qstringparser/qstringparser.h
+++ b/src/libs/3rdparty/modeling/qstringparser/qstringparser.h
@@ -51,7 +51,7 @@ private:
         class RefNode : public Node
         {
         public:
-            RefNode(V &v) : m_v(v) { }
+            explicit RefNode(V &v) : m_v(v) { }
             bool accept(Parser &visitor, int *index) override { return visitor.visit(this, index); }
             V &ref() const { return m_v; }
         private:
diff --git a/src/libs/3rdparty/modeling/qtserialization/inc/qark/parameters.h b/src/libs/3rdparty/modeling/qtserialization/inc/qark/parameters.h
index fde0229b8f4..142e25122f6 100644
--- a/src/libs/3rdparty/modeling/qtserialization/inc/qark/parameters.h
+++ b/src/libs/3rdparty/modeling/qtserialization/inc/qark/parameters.h
@@ -42,7 +42,7 @@ public:
     {
     }
 
-    Parameters(const Flag &flag)
+    explicit Parameters(const Flag &flag)
         : m_flags(flag.mask())
     {
     }