Use override in more classes in core/

core/src/fpdfdoc/tagged_int.h

Index: core/src/fpdfdoc/tagged_int.h
diff --git a/core/src/fpdfdoc/tagged_int.h b/core/src/fpdfdoc/tagged_int.h
index 7cf368083c96cacc62cfea6b6edbf294b3c60ac9..de6854ea0b8bbf8d294205f011eac64bec7d1bf0 100644
--- a/core/src/fpdfdoc/tagged_int.h
+++ b/core/src/fpdfdoc/tagged_int.h
@@ -10,14 +10,18 @@
 #include "../../include/fpdfdoc/fpdf_tagged.h"
 
 class CPDF_StructElementImpl;
+
 class CPDF_StructTreeImpl : public CPDF_StructTree {
  public:
-  CPDF_StructTreeImpl(const CPDF_Document* pDoc);
-  ~CPDF_StructTreeImpl();
-  int CountTopElements() const { return m_Kids.GetSize(); }
-  CPDF_StructElement* GetTopElement(int i) const {
+  explicit CPDF_StructTreeImpl(const CPDF_Document* pDoc);
+  ~CPDF_StructTreeImpl() override;
+
+  // CPDF_StructTree
+  int CountTopElements() const override { return m_Kids.GetSize(); }
+  CPDF_StructElement* GetTopElement(int i) const override {
     return (CPDF_StructElement*)m_Kids.GetAt(i);
   }
+
   void LoadDocTree();
   void LoadPageTree(const CPDF_Dictionary* pPageDict);
   CPDF_StructElementImpl* AddPageNode(CPDF_Dictionary* pElement,
@@ -33,46 +37,48 @@ class CPDF_StructTreeImpl : public CPDF_StructTree {
   CFX_ArrayTemplate<CPDF_StructElementImpl*> m_Kids;
   friend class CPDF_StructElementImpl;
 };
+
 class CPDF_StructElementImpl final : public CPDF_StructElement {
  public:
   CPDF_StructElementImpl(CPDF_StructTreeImpl* pTree,
                          CPDF_StructElementImpl* pParent,
                          CPDF_Dictionary* pDict);
-  CPDF_StructTree* GetTree() const { return m_pTree; }
-  const CFX_ByteString& GetType() const { return m_Type; }
-  CPDF_StructElement* GetParent() const { return m_pParent; }
-  CPDF_Dictionary* GetDict() const { return m_pDict; }
-  int CountKids() const { return m_Kids.GetSize(); }
-  const CPDF_StructKid& GetKid(int index) const {
+
+  // CPDF_StructTreeImpl
+  CPDF_StructTree* GetTree() const override { return m_pTree; }
+  const CFX_ByteString& GetType() const override { return m_Type; }
+  CPDF_StructElement* GetParent() const override { return m_pParent; }
+  CPDF_Dictionary* GetDict() const override { return m_pDict; }
+  int CountKids() const override { return m_Kids.GetSize(); }
+  const CPDF_StructKid& GetKid(int index) const override {
     return m_Kids.GetData()[index];
   }
-  CFX_PtrArray* GetObjectArray() { return &m_ObjectArray; }
-
+  CFX_PtrArray* GetObjectArray() override { return &m_ObjectArray; }
   CPDF_Object* GetAttr(const CFX_ByteStringC& owner,
                        const CFX_ByteStringC& name,
                        FX_BOOL bInheritable = FALSE,
-                       FX_FLOAT fLevel = 0.0F);
-
+                       FX_FLOAT fLevel = 0.0F) override;
   CFX_ByteString GetName(const CFX_ByteStringC& owner,
                          const CFX_ByteStringC& name,
                          const CFX_ByteStringC& default_value,
                          FX_BOOL bInheritable = FALSE,
-                         int subindex = -1);
+                         int subindex = -1) override;
   FX_ARGB GetColor(const CFX_ByteStringC& owner,
                    const CFX_ByteStringC& name,
                    FX_ARGB default_value,
                    FX_BOOL bInheritable = FALSE,
-                   int subindex = -1);
+                   int subindex = -1) override;
   FX_FLOAT GetNumber(const CFX_ByteStringC& owner,
                      const CFX_ByteStringC& name,
                      FX_FLOAT default_value,
                      FX_BOOL bInheritable = FALSE,
-                     int subindex = -1);
+                     int subindex = -1) override;
   int GetInteger(const CFX_ByteStringC& owner,
                  const CFX_ByteStringC& name,
                  int default_value,
                  FX_BOOL bInheritable = FALSE,
-                 int subindex = -1);
+                 int subindex = -1) override;
+
   CFX_PtrArray m_ObjectArray;
   void LoadKids(CPDF_Dictionary* pDict);
   void LoadKid(FX_DWORD PageObjNum, CPDF_Object* pObj, CPDF_StructKid* pKid);
@@ -84,7 +90,7 @@ class CPDF_StructElementImpl final : public CPDF_StructElement {
   void Release();
 
  protected:
-  ~CPDF_StructElementImpl();
+  ~CPDF_StructElementImpl() override;
 
   CPDF_StructTreeImpl* m_pTree;
   CFX_ByteString m_Type;