Modernize C++ code using override

The modifications were done using this command:

    run-clang-tidy-8.py -header-filter='.*' -checks='-*,modernize-use-override' -fix

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/api/renderer.h

@@ -148,7 +148,7 @@ class TESS_API TessTextRenderer : public TessResultRenderer {
   explicit TessTextRenderer(const char *outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 /**
@@ -160,9 +160,9 @@ class TESS_API TessHOcrRenderer : public TessResultRenderer {
   explicit TessHOcrRenderer(const char *outputbase);
 
  protected:
-  virtual bool BeginDocumentHandler();
-  virtual bool AddImageHandler(TessBaseAPI* api);
-  virtual bool EndDocumentHandler();
+  bool BeginDocumentHandler() override;
+  bool AddImageHandler(TessBaseAPI* api) override;
+  bool EndDocumentHandler() override;
 
  private:
   bool font_info_;  // whether to print font information
@@ -176,9 +176,9 @@ class TESS_API TessHOcrRenderer : public TessResultRenderer {
         explicit TessAltoRenderer(const char *outputbase);
 
     protected:
-        virtual bool BeginDocumentHandler();
-        virtual bool AddImageHandler(TessBaseAPI* api);
-        virtual bool EndDocumentHandler();
+        bool BeginDocumentHandler() override;
+        bool AddImageHandler(TessBaseAPI* api) override;
+        bool EndDocumentHandler() override;
 
     };
 
@@ -191,9 +191,9 @@ class TESS_API TessTsvRenderer : public TessResultRenderer {
   explicit TessTsvRenderer(const char* outputbase);
 
  protected:
-  virtual bool BeginDocumentHandler();
-  virtual bool AddImageHandler(TessBaseAPI* api);
-  virtual bool EndDocumentHandler();
+  bool BeginDocumentHandler() override;
+  bool AddImageHandler(TessBaseAPI* api) override;
+  bool EndDocumentHandler() override;
 
  private:
   bool font_info_;              // whether to print font information
@@ -209,9 +209,9 @@ class TESS_API TessPDFRenderer : public TessResultRenderer {
   TessPDFRenderer(const char* outputbase, const char* datadir, bool textonly = false);
 
  protected:
-  virtual bool BeginDocumentHandler();
-  virtual bool AddImageHandler(TessBaseAPI* api);
-  virtual bool EndDocumentHandler();
+  bool BeginDocumentHandler() override;
+  bool AddImageHandler(TessBaseAPI* api) override;
+  bool EndDocumentHandler() override;
 
  private:
   // We don't want to have every image in memory at once,
@@ -244,7 +244,7 @@ class TESS_API TessUnlvRenderer : public TessResultRenderer {
   explicit TessUnlvRenderer(const char *outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 /**
@@ -255,7 +255,7 @@ class TESS_API TessLSTMBoxRenderer : public TessResultRenderer {
   explicit TessLSTMBoxRenderer(const char* outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 /**
@@ -266,7 +266,7 @@ class TESS_API TessBoxTextRenderer : public TessResultRenderer {
   explicit TessBoxTextRenderer(const char *outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 /**
@@ -277,7 +277,7 @@ class TESS_API TessWordStrBoxRenderer : public TessResultRenderer {
   explicit TessWordStrBoxRenderer(const char* outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 #ifndef DISABLED_LEGACY_ENGINE
@@ -290,7 +290,7 @@ class TESS_API TessOsdRenderer : public TessResultRenderer {
   explicit TessOsdRenderer(const char* outputbase);
 
  protected:
-  virtual bool AddImageHandler(TessBaseAPI* api);
+  bool AddImageHandler(TessBaseAPI* api) override;
 };
 
 #endif // ndef DISABLED_LEGACY_ENGINE

src/ccmain/equationdetect.h

@@ -40,7 +40,7 @@ class EquationDetect : public EquationDetectBase {
  public:
   EquationDetect(const char* equ_datapath,
                  const char* equ_language);
-  ~EquationDetect();
+  ~EquationDetect() override;
 
   enum IndentType {
     NO_INDENT,
@@ -57,13 +57,13 @@ class EquationDetect : public EquationDetectBase {
   // Iterate over the blobs inside to_block, and set the blobs that we want to
   // process to BSTT_NONE. (By default, they should be BSTT_SKIP). The function
   // returns 0 upon success.
-  int LabelSpecialText(TO_BLOCK* to_block);
+  int LabelSpecialText(TO_BLOCK* to_block) override;
 
   // Find possible equation partitions from part_grid. Should be called
   // after the special_text_type of blobs are set.
   // It returns 0 upon success.
   int FindEquationParts(ColPartitionGrid* part_grid,
-                        ColPartitionSet** best_columns);
+                        ColPartitionSet** best_columns) override;
 
   // Reset the resolution of the processing image. TEST only function.
   void SetResolution(const int resolution);

src/ccmain/ltrresultiterator.h

@@ -65,7 +65,7 @@ class TESS_API LTRResultIterator : public PageIterator {
                     int rect_left, int rect_top,
                     int rect_width, int rect_height);
 
-  virtual ~LTRResultIterator();
+  ~LTRResultIterator() override;
 
   // LTRResultIterators may be copied! This makes it possible to iterate over
   // all the objects at a lower level, while maintaining an iterator to

src/ccmain/mutableiterator.h

@@ -51,7 +51,7 @@ class MutableIterator : public ResultIterator {
       : ResultIterator(
           LTRResultIterator(page_res, tesseract, scale, scaled_yres, rect_left,
                             rect_top, rect_width, rect_height)) {}
-  virtual ~MutableIterator();
+  ~MutableIterator() override;
 
   // See PageIterator and ResultIterator for most calls.
 

src/ccmain/paramsd.h

@@ -103,7 +103,7 @@ class ParamsEditor : public SVEventHandler {
   explicit ParamsEditor(tesseract::Tesseract*, ScrollView* sv = nullptr);
 
   // Event listener. Waits for SVET_POPUP events and processes them.
-  void Notify(const SVEvent* sve);
+  void Notify(const SVEvent* sve) override;
 
  private:
   // Gets the up to the first 3 prefixes from s (split by _).

src/ccmain/pgedit.cpp

@@ -148,7 +148,7 @@ STRING_VAR(editor_debug_config_file, "", "Config file to apply to single words")
 
 class BlnEventHandler : public SVEventHandler {
  public:
-  void Notify(const SVEvent* sv_event) {
+  void Notify(const SVEvent* sv_event) override {
     if (sv_event->type == SVET_DESTROY)
       bln_word_window = nullptr;
     else if (sv_event->type == SVET_CLICK)

src/ccmain/pgedit.h

@@ -36,7 +36,7 @@ class PGEventHandler : public SVEventHandler {
   public:
    PGEventHandler(tesseract::Tesseract* tess) : tess_(tess) {
    }
-   void Notify(const SVEvent* sve);
+   void Notify(const SVEvent* sve) override;
   private:
     tesseract::Tesseract* tess_;
 };

src/ccmain/resultiterator.h

@@ -46,14 +46,14 @@ class TESS_API ResultIterator : public LTRResultIterator {
    * ResultIterator is copy constructible!
    * The default copy constructor works just fine for us.
    */
-  virtual ~ResultIterator() = default;
+  ~ResultIterator() override = default;
 
   // ============= Moving around within the page ============.
   /**
    * Moves the iterator to point to the start of the page to begin
    * an iteration.
    */
-  virtual void Begin();
+  void Begin() override;
 
   /**
    * Moves to the start of the next object at the given level in the
@@ -67,23 +67,23 @@ class TESS_API ResultIterator : public LTRResultIterator {
    * This function iterates words in right-to-left scripts correctly, if
    * the appropriate language has been loaded into Tesseract.
    */
-  virtual bool Next(PageIteratorLevel level);
+  bool Next(PageIteratorLevel level) override;
 
   /**
    * IsAtBeginningOf() returns whether we're at the logical beginning of the
    * given level.  (as opposed to ResultIterator's left-to-right top-to-bottom
    * order).  Otherwise, this acts the same as PageIterator::IsAtBeginningOf().
    * For a full description, see pageiterator.h
    */
-  virtual bool IsAtBeginningOf(PageIteratorLevel level) const;
+  bool IsAtBeginningOf(PageIteratorLevel level) const override;
 
   /**
    * Implement PageIterator's IsAtFinalElement correctly in a BiDi context.
    * For instance, IsAtFinalElement(RIL_PARA, RIL_WORD) returns whether we
    * point at the last word in a paragraph.  See PageIterator for full comment.
   */
-  virtual bool IsAtFinalElement(PageIteratorLevel level,
-                                PageIteratorLevel element) const;
+  bool IsAtFinalElement(PageIteratorLevel level,
+                                PageIteratorLevel element) const override;
 
   // ============= Functions that refer to words only ============.
   // Returns the number of blanks before the current word.

src/ccmain/tesseractclass.h

@@ -173,7 +173,7 @@ typedef void (Tesseract::*WordRecognizer)(const WordData& word_data,
 class Tesseract : public Wordrec {
  public:
   Tesseract();
-  ~Tesseract();
+  ~Tesseract() override;
 
   // Return appropriate dictionary
   Dict& getDict() override;

src/ccstruct/ccstruct.h

@@ -25,7 +25,7 @@ namespace tesseract {
 class CCStruct : public CUtil {
  public:
   CCStruct() = default;
-  virtual ~CCStruct();
+  ~CCStruct() override;
 
   // Globally accessible constants.
   // APPROXIMATIONS of the fractions of the character cell taken by

src/ccstruct/matrix.h

@@ -540,7 +540,7 @@ class BandTriMatrix : public GENERIC_2D_ARRAY<T> {
   // Expression to select a specific location in the matrix. The matrix is
   // stored COLUMN-major, so the left-most index is the most significant.
   // This allows [][] access to use indices in the same order as (,).
-  virtual int index(int column, int row) const {
+  int index(int column, int row) const override {
     ASSERT_HOST(row >= column);
     ASSERT_HOST(row - column < this->dim2_);
     return column * this->dim2_ + row - column;
@@ -580,7 +580,7 @@ class MATRIX : public BandTriMatrix<BLOB_CHOICE_LIST *> {
   MATRIX(int dimension, int bandwidth)
     : BandTriMatrix<BLOB_CHOICE_LIST *>(dimension, bandwidth, NOT_CLASSIFIED) {}
 
-  virtual ~MATRIX();
+  ~MATRIX() override;
 
   // Returns true if there are any real classification results.
   bool Classified(int col, int row, int wildcard_id) const;

src/ccutil/indexmapbidi.h

@@ -101,7 +101,7 @@ class IndexMap {
 //    Allows a many-to-one mapping by merging compact space indices.
 class IndexMapBiDi : public IndexMap {
  public:
-  virtual ~IndexMapBiDi();
+  ~IndexMapBiDi() override;
 
   // Top-level init function in a single call to initialize a map to select
   // a single contiguous subrange [start, end) of the sparse space to be mapped
@@ -135,11 +135,11 @@ class IndexMapBiDi : public IndexMap {
   void CompleteMerges();
 
   // SparseToCompact takes a sparse index to an index in the compact space.
-  virtual int SparseToCompact(int sparse_index) const {
+  int SparseToCompact(int sparse_index) const override {
     return sparse_map_[sparse_index];
   }
   // The size of the sparse space.
-  virtual int SparseSize() const {
+  int SparseSize() const override {
     return sparse_map_.size();
   }