Replace 'virtual' specifier with 'override'

29 files changed, 107 insertions, 107 deletions

diff --git a/examples/pdf-count-strings.cc b/examples/pdf-count-strings.cc
index 584d630b..93676375 100644
--- a/examples/pdf-count-strings.cc
+++ b/examples/pdf-count-strings.cc
@@ -30,9 +30,9 @@ class StringCounter: public QPDFObjectHandle::TokenFilter
         count(0)
     {
     }
-    virtual ~StringCounter() = default;
-    virtual void handleToken(QPDFTokenizer::Token const&);
-    virtual void handleEOF();
+    ~StringCounter() override = default;
+    void handleToken(QPDFTokenizer::Token const&) override;
+    void handleEOF() override;
     int getCount() const;
 
   private:
diff --git a/examples/pdf-create.cc b/examples/pdf-create.cc
index af7ec6b7..64ae5cb8 100644
--- a/examples/pdf-create.cc
+++ b/examples/pdf-create.cc
@@ -26,8 +26,8 @@ class ImageProvider: public QPDFObjectHandle::StreamDataProvider
 {
   public:
     ImageProvider(std::string const& color_space, std::string const& filter);
-    virtual ~ImageProvider() = default;
-    virtual void provideStreamData(QPDFObjGen const&, Pipeline* pipeline);
+    ~ImageProvider() override = default;
+    void provideStreamData(QPDFObjGen const&, Pipeline* pipeline) override;
     size_t getWidth() const;
     size_t getHeight() const;
 
diff --git a/examples/pdf-custom-filter.cc b/examples/pdf-custom-filter.cc
index 30f02d5c..d99c6ab2 100644
--- a/examples/pdf-custom-filter.cc
+++ b/examples/pdf-custom-filter.cc
@@ -48,7 +48,7 @@ class Pl_XOR: public Pipeline
 
   public:
     Pl_XOR(char const* identifier, Pipeline* next, unsigned char key);
-    virtual ~Pl_XOR() = default;
+    ~Pl_XOR() override = default;
     void write(unsigned char const* data, size_t len) override;
     void finish() override;
 
@@ -91,7 +91,7 @@ class SF_XORDecode: public QPDFStreamFilter
     // filter, which just means QPDF assumes that it should not
     // "uncompress" the stream by default.
   public:
-    virtual ~SF_XORDecode() = default;
+    ~SF_XORDecode() override = default;
     bool setDecodeParms(QPDFObjectHandle decode_parms) override;
     Pipeline* getDecodePipeline(Pipeline* next) override;
     bool isSpecializedCompression() override;
@@ -199,7 +199,7 @@ class StreamReplacer: public QPDFObjectHandle::StreamDataProvider
 
   public:
     StreamReplacer(QPDF* pdf);
-    virtual ~StreamReplacer() = default;
+    ~StreamReplacer() override = default;
     void
     provideStreamData(QPDFObjGen const& og, Pipeline* pipeline) override;
 
diff --git a/examples/pdf-filter-tokens.cc b/examples/pdf-filter-tokens.cc
index 173feb6a..a897ef65 100644
--- a/examples/pdf-filter-tokens.cc
+++ b/examples/pdf-filter-tokens.cc
@@ -33,8 +33,8 @@ usage()
 class StringReverser: public QPDFObjectHandle::TokenFilter
 {
   public:
-    virtual ~StringReverser() = default;
-    virtual void handleToken(QPDFTokenizer::Token const&);
+    ~StringReverser() override = default;
+    void handleToken(QPDFTokenizer::Token const&) override;
 };
 
 void
@@ -66,9 +66,9 @@ StringReverser::handleToken(QPDFTokenizer::Token const& token)
 class ColorToGray: public QPDFObjectHandle::TokenFilter
 {
   public:
-    virtual ~ColorToGray() = default;
-    virtual void handleToken(QPDFTokenizer::Token const&);
-    virtual void handleEOF();
+    ~ColorToGray() override = default;
+    void handleToken(QPDFTokenizer::Token const&) override;
+    void handleEOF() override;
 
   private:
     bool isNumeric(QPDFTokenizer::token_type_e);
diff --git a/examples/pdf-invert-images.cc b/examples/pdf-invert-images.cc
index d714148c..fae305b1 100644
--- a/examples/pdf-invert-images.cc
+++ b/examples/pdf-invert-images.cc
@@ -33,7 +33,7 @@ usage()
 class ImageInverter: public QPDFObjectHandle::StreamDataProvider
 {
   public:
-    virtual ~ImageInverter() = default;
+    ~ImageInverter() override = default;
     void
     provideStreamData(QPDFObjGen const& og, Pipeline* pipeline) override;
 
diff --git a/examples/pdf-parse-content.cc b/examples/pdf-parse-content.cc
index 49440418..968c980b 100644
--- a/examples/pdf-parse-content.cc
+++ b/examples/pdf-parse-content.cc
@@ -22,10 +22,10 @@ usage()
 class ParserCallbacks: public QPDFObjectHandle::ParserCallbacks
 {
   public:
-    virtual ~ParserCallbacks() = default;
-    virtual void contentSize(size_t);
-    virtual void handleObject(QPDFObjectHandle, size_t offset, size_t length);
-    virtual void handleEOF();
+    ~ParserCallbacks() override = default;
+    void contentSize(size_t) override;
+    void handleObject(QPDFObjectHandle, size_t offset, size_t length) override;
+    void handleEOF() override;
 };
 
 void
diff --git a/fuzz/qpdf_fuzzer.cc b/fuzz/qpdf_fuzzer.cc
index c402a772..8d4534bd 100644
--- a/fuzz/qpdf_fuzzer.cc
+++ b/fuzz/qpdf_fuzzer.cc
@@ -14,13 +14,13 @@
 class DiscardContents: public QPDFObjectHandle::ParserCallbacks
 {
   public:
-    virtual ~DiscardContents() = default;
-    virtual void
-    handleObject(QPDFObjectHandle)
+    ~DiscardContents() override = default;
+    void
+    handleObject(QPDFObjectHandle) override
     {
     }
-    virtual void
-    handleEOF()
+    void
+    handleEOF() override
     {
     }
 };
diff --git a/include/qpdf/JSON.hh b/include/qpdf/JSON.hh
index 34333e93..3ff714ae 100644
--- a/include/qpdf/JSON.hh
+++ b/include/qpdf/JSON.hh
@@ -369,8 +369,8 @@ class JSON
             JSON_value(vt_dictionary)
         {
         }
-        virtual ~JSON_dictionary() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_dictionary() override = default;
+        void write(Pipeline*, size_t depth) const override;
         std::map<std::string, JSON> members;
         std::set<std::string> parsed_keys;
     };
@@ -380,15 +380,15 @@ class JSON
             JSON_value(vt_array)
         {
         }
-        virtual ~JSON_array() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_array() override = default;
+        void write(Pipeline*, size_t depth) const override;
         std::vector<JSON> elements;
     };
     struct JSON_string: public JSON_value
     {
         JSON_string(std::string const& utf8);
-        virtual ~JSON_string() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_string() override = default;
+        void write(Pipeline*, size_t depth) const override;
         std::string utf8;
         std::string encoded;
     };
@@ -397,15 +397,15 @@ class JSON
         JSON_number(long long val);
         JSON_number(double val);
         JSON_number(std::string const& val);
-        virtual ~JSON_number() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_number() override = default;
+        void write(Pipeline*, size_t depth) const override;
         std::string encoded;
     };
     struct JSON_bool: public JSON_value
     {
         JSON_bool(bool val);
-        virtual ~JSON_bool() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_bool() override = default;
+        void write(Pipeline*, size_t depth) const override;
         bool value;
     };
     struct JSON_null: public JSON_value
@@ -414,14 +414,14 @@ class JSON
             JSON_value(vt_null)
         {
         }
-        virtual ~JSON_null() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_null() override = default;
+        void write(Pipeline*, size_t depth) const override;
     };
     struct JSON_blob: public JSON_value
     {
         JSON_blob(std::function<void(Pipeline*)> fn);
-        virtual ~JSON_blob() = default;
-        virtual void write(Pipeline*, size_t depth) const;
+        ~JSON_blob() override = default;
+        void write(Pipeline*, size_t depth) const override;
         std::function<void(Pipeline*)> fn;
     };
 
diff --git a/include/qpdf/Pl_Buffer.hh b/include/qpdf/Pl_Buffer.hh
index fcef0c56..ffc01d95 100644
--- a/include/qpdf/Pl_Buffer.hh
+++ b/include/qpdf/Pl_Buffer.hh
@@ -45,11 +45,11 @@ class QPDF_DLL_CLASS Pl_Buffer: public Pipeline
     QPDF_DLL
     Pl_Buffer(char const* identifier, Pipeline* next = nullptr);
     QPDF_DLL
-    virtual ~Pl_Buffer();
+    ~Pl_Buffer() override;
     QPDF_DLL
-    virtual void write(unsigned char const*, size_t);
+    void write(unsigned char const*, size_t) override;
     QPDF_DLL
-    virtual void finish();
+    void finish() override;
 
     // Each call to getBuffer() resets this object -- see notes above.
     // The caller is responsible for deleting the returned Buffer
diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index dcfd5f46..09221394 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -60,7 +60,7 @@ namespace
     class InvalidInputSource: public InputSource
     {
       public:
-        virtual ~InvalidInputSource() = default;
+        ~InvalidInputSource() override = default;
         qpdf_offset_t
         findAndSkipNextEOL() override
         {
diff --git a/libqpdf/QPDFFormFieldObjectHelper.cc b/libqpdf/QPDFFormFieldObjectHelper.cc
index 7712cab2..4b95c91f 100644
--- a/libqpdf/QPDFFormFieldObjectHelper.cc
+++ b/libqpdf/QPDFFormFieldObjectHelper.cc
@@ -515,9 +515,9 @@ namespace
             std::vector<std::string> const& opt,
             double tf,
             QPDFObjectHandle::Rectangle const& bbox);
-        virtual ~ValueSetter() = default;
-        virtual void handleToken(QPDFTokenizer::Token const&);
-        virtual void handleEOF();
+        ~ValueSetter() override = default;
+        void handleToken(QPDFTokenizer::Token const&) override;
+        void handleEOF() override;
         void writeAppearance();
 
       private:
@@ -706,10 +706,10 @@ namespace
     {
       public:
         TfFinder();
-        virtual ~TfFinder()
+        ~TfFinder() override
         {
         }
-        virtual void handleToken(QPDFTokenizer::Token const&);
+        void handleToken(QPDFTokenizer::Token const&) override;
         double getTf();
         std::string getFontName();
         std::string getDA();
diff --git a/libqpdf/QPDFJob.cc b/libqpdf/QPDFJob.cc
index 14583104..0e5ad3ae 100644
--- a/libqpdf/QPDFJob.cc
+++ b/libqpdf/QPDFJob.cc
@@ -48,8 +48,8 @@ namespace
             size_t oi_min_height,
             size_t oi_min_area,
             QPDFObjectHandle& image);
-        virtual ~ImageOptimizer() = default;
-        virtual void provideStreamData(QPDFObjGen const&, Pipeline* pipeline);
+        ~ImageOptimizer() override = default;
+        void provideStreamData(QPDFObjGen const&, Pipeline* pipeline) override;
         std::shared_ptr<Pipeline>
         makePipeline(std::string const& description, Pipeline* next);
         bool evaluate(std::string const& description);
@@ -65,13 +65,13 @@ namespace
     class DiscardContents: public QPDFObjectHandle::ParserCallbacks
     {
       public:
-        virtual ~DiscardContents() = default;
-        virtual void
-        handleObject(QPDFObjectHandle)
+        ~DiscardContents() override = default;
+        void
+        handleObject(QPDFObjectHandle) override
         {
         }
-        virtual void
-        handleEOF()
+        void
+        handleEOF() override
         {
         }
     };
@@ -98,8 +98,8 @@ namespace
             filename(filename)
         {
         }
-        virtual ~ProgressReporter() = default;
-        virtual void reportProgress(int);
+        ~ProgressReporter() override = default;
+        void reportProgress(int) override;
 
       private:
         Pipeline& p;
diff --git a/libqpdf/QPDFObjectHandle.cc b/libqpdf/QPDFObjectHandle.cc
index 8b30f95b..93d269d3 100644
--- a/libqpdf/QPDFObjectHandle.cc
+++ b/libqpdf/QPDFObjectHandle.cc
@@ -111,8 +111,8 @@ namespace
             old_contents(old_contents)
         {
         }
-        virtual ~CoalesceProvider() = default;
-        virtual void provideStreamData(QPDFObjGen const&, Pipeline* pipeline);
+        ~CoalesceProvider() override = default;
+        void provideStreamData(QPDFObjGen const&, Pipeline* pipeline) override;
 
       private:
         QPDFObjectHandle containing_page;
@@ -200,9 +200,9 @@ namespace
     {
       public:
         LastChar(Pipeline* next);
-        virtual ~LastChar() = default;
-        virtual void write(unsigned char const* data, size_t len);
-        virtual void finish();
+        ~LastChar() override = default;
+        void write(unsigned char const* data, size_t len) override;
+        void finish() override;
         unsigned char getLastChar();
 
       private:
diff --git a/libqpdf/QPDFTokenizer.cc b/libqpdf/QPDFTokenizer.cc
index d83080b2..1a14e3a9 100644
--- a/libqpdf/QPDFTokenizer.cc
+++ b/libqpdf/QPDFTokenizer.cc
@@ -35,8 +35,8 @@ namespace
             str(str)
         {
         }
-        virtual ~QPDFWordTokenFinder() = default;
-        virtual bool check();
+        ~QPDFWordTokenFinder() override = default;
+        bool check() override;
 
       private:
         std::shared_ptr<InputSource> is;
diff --git a/libqpdf/QPDF_Stream.cc b/libqpdf/QPDF_Stream.cc
index 4ceeab48..9cfb3ac4 100644
--- a/libqpdf/QPDF_Stream.cc
+++ b/libqpdf/QPDF_Stream.cc
@@ -27,10 +27,10 @@ namespace
     {
       public:
         SF_Crypt() = default;
-        virtual ~SF_Crypt() = default;
+        ~SF_Crypt() override = default;
 
-        virtual bool
-        setDecodeParms(QPDFObjectHandle decode_parms)
+        bool
+        setDecodeParms(QPDFObjectHandle decode_parms) override
         {
             if (decode_parms.isNull()) {
                 return true;
@@ -49,8 +49,8 @@ namespace
             return filterable;
         }
 
-        virtual Pipeline*
-        getDecodePipeline(Pipeline*)
+        Pipeline*
+        getDecodePipeline(Pipeline*) override
         {
             // Not used -- handled by pipeStreamData
             return nullptr;
diff --git a/libqpdf/qpdf/ContentNormalizer.hh b/libqpdf/qpdf/ContentNormalizer.hh
index ba1063e0..d423aa4c 100644
--- a/libqpdf/qpdf/ContentNormalizer.hh
+++ b/libqpdf/qpdf/ContentNormalizer.hh
@@ -7,8 +7,8 @@ class ContentNormalizer: public QPDFObjectHandle::TokenFilter
 {
   public:
     ContentNormalizer();
-    virtual ~ContentNormalizer() = default;
-    virtual void handleToken(QPDFTokenizer::Token const&);
+    ~ContentNormalizer() override = default;
+    void handleToken(QPDFTokenizer::Token const&) override;
 
     bool anyBadTokens() const;
     bool lastTokenWasBad() const;
diff --git a/libqpdf/qpdf/CryptoRandomDataProvider.hh b/libqpdf/qpdf/CryptoRandomDataProvider.hh
index 89859e65..e402d944 100644
--- a/libqpdf/qpdf/CryptoRandomDataProvider.hh
+++ b/libqpdf/qpdf/CryptoRandomDataProvider.hh
@@ -7,8 +7,8 @@ class CryptoRandomDataProvider: public RandomDataProvider
 {
   public:
     CryptoRandomDataProvider() = default;
-    virtual ~CryptoRandomDataProvider() = default;
-    virtual void provideRandomData(unsigned char* data, size_t len);
+    ~CryptoRandomDataProvider() override = default;
+    void provideRandomData(unsigned char* data, size_t len) override;
     static RandomDataProvider* getInstance();
 };
 
diff --git a/libqpdf/qpdf/InsecureRandomDataProvider.hh b/libqpdf/qpdf/InsecureRandomDataProvider.hh
index 47a81afe..bab4e002 100644
--- a/libqpdf/qpdf/InsecureRandomDataProvider.hh
+++ b/libqpdf/qpdf/InsecureRandomDataProvider.hh
@@ -7,8 +7,8 @@ class InsecureRandomDataProvider: public RandomDataProvider
 {
   public:
     InsecureRandomDataProvider();
-    virtual ~InsecureRandomDataProvider() = default;
-    virtual void provideRandomData(unsigned char* data, size_t len);
+    ~InsecureRandomDataProvider() override = default;
+    void provideRandomData(unsigned char* data, size_t len) override;
     static RandomDataProvider* getInstance();
 
   private:
diff --git a/libqpdf/qpdf/OffsetInputSource.hh b/libqpdf/qpdf/OffsetInputSource.hh
index d8b08145..fdc1a404 100644
--- a/libqpdf/qpdf/OffsetInputSource.hh
+++ b/libqpdf/qpdf/OffsetInputSource.hh
@@ -11,15 +11,15 @@ class OffsetInputSource: public InputSource
   public:
     OffsetInputSource(
         std::shared_ptr<InputSource>, qpdf_offset_t global_offset);
-    virtual ~OffsetInputSource() = default;
+    ~OffsetInputSource() override = default;
 
-    virtual qpdf_offset_t findAndSkipNextEOL();
-    virtual std::string const& getName() const;
-    virtual qpdf_offset_t tell();
-    virtual void seek(qpdf_offset_t offset, int whence);
-    virtual void rewind();
-    virtual size_t read(char* buffer, size_t length);
-    virtual void unreadCh(char ch);
+    qpdf_offset_t findAndSkipNextEOL() override;
+    std::string const& getName() const override;
+    qpdf_offset_t tell() override;
+    void seek(qpdf_offset_t offset, int whence) override;
+    void rewind() override;
+    size_t read(char* buffer, size_t length) override;
+    void unreadCh(char ch) override;
 
   private:
     std::shared_ptr<InputSource> proxied;
diff --git a/libqpdf/qpdf/Pl_AES_PDF.hh b/libqpdf/qpdf/Pl_AES_PDF.hh
index 18091583..b3fde312 100644
--- a/libqpdf/qpdf/Pl_AES_PDF.hh
+++ b/libqpdf/qpdf/Pl_AES_PDF.hh
@@ -18,10 +18,10 @@ class Pl_AES_PDF: public Pipeline
         bool encrypt,
         unsigned char const* key,
         size_t key_bytes);
-    virtual ~Pl_AES_PDF() = default;
+    ~Pl_AES_PDF() override = default;
 
-    virtual void write(unsigned char const* data, size_t len);
-    virtual void finish();
+    void write(unsigned char const* data, size_t len) override;
+    void finish() override;
 
     // Use zero initialization vector; needed for AESV3
     void useZeroIV();
diff --git a/libqpdf/qpdf/Pl_ASCII85Decoder.hh b/libqpdf/qpdf/Pl_ASCII85Decoder.hh
index 667b56e9..dd5efd06 100644
--- a/libqpdf/qpdf/Pl_ASCII85Decoder.hh
+++ b/libqpdf/qpdf/Pl_ASCII85Decoder.hh
@@ -7,9 +7,9 @@ class Pl_ASCII85Decoder: public Pipeline
 {
   public:
     Pl_ASCII85Decoder(char const* identifier, Pipeline* next);
-    virtual ~Pl_ASCII85Decoder() = default;
-    virtual void write(unsigned char const* buf, size_t len);
-    virtual void finish();
+    ~Pl_ASCII85Decoder() override = default;
+    void write(unsigned char const* buf, size_t len) override;
+    void finish() override;
 
   private:
     void flush();
diff --git a/libqpdf/qpdf/Pl_ASCIIHexDecoder.hh b/libqpdf/qpdf/Pl_ASCIIHexDecoder.hh
index c71dcf00..5edf74f0 100644
--- a/libqpdf/qpdf/Pl_ASCIIHexDecoder.hh
+++ b/libqpdf/qpdf/Pl_ASCIIHexDecoder.hh
@@ -7,9 +7,9 @@ class Pl_ASCIIHexDecoder: public Pipeline
 {
   public:
     Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next);
-    virtual ~Pl_ASCIIHexDecoder() = default;
-    virtual void write(unsigned char const* buf, size_t len);
-    virtual void finish();
+    ~Pl_ASCIIHexDecoder() override = default;
+    void write(unsigned char const* buf, size_t len) override;
+    void finish() override;
 
   private:
     void flush();
diff --git a/libqpdf/qpdf/Pl_Base64.hh b/libqpdf/qpdf/Pl_Base64.hh
index 0e490cfe..a084a17f 100644
--- a/libqpdf/qpdf/Pl_Base64.hh
+++ b/libqpdf/qpdf/Pl_Base64.hh
@@ -8,7 +8,7 @@ class Pl_Base64: public Pipeline
   public:
     enum action_e { a_encode, a_decode };
     Pl_Base64(char const* identifier, Pipeline* next, action_e);
-    virtual ~Pl_Base64() = default;
+    ~Pl_Base64() override = default;
     void write(unsigned char const* buf, size_t len) override;
     void finish() override;
 
diff --git a/libqpdf/qpdf/Pl_PNGFilter.hh b/libqpdf/qpdf/Pl_PNGFilter.hh
index 6cc34a9c..7ab7bf0d 100644
--- a/libqpdf/qpdf/Pl_PNGFilter.hh
+++ b/libqpdf/qpdf/Pl_PNGFilter.hh
@@ -22,10 +22,10 @@ class Pl_PNGFilter: public Pipeline
         unsigned int columns,
         unsigned int samples_per_pixel = 1,
         unsigned int bits_per_sample = 8);
-    virtual ~Pl_PNGFilter() = default;
+    ~Pl_PNGFilter() override = default;
 
-    virtual void write(unsigned char const* data, size_t len);
-    virtual void finish();
+    void write(unsigned char const* data, size_t len) override;
+    void finish() override;
 
   private:
     void decodeSub();
diff --git a/libqpdf/qpdf/Pl_RC4.hh b/libqpdf/qpdf/Pl_RC4.hh
index 07b8a1c4..49c943b9 100644
--- a/libqpdf/qpdf/Pl_RC4.hh
+++ b/libqpdf/qpdf/Pl_RC4.hh
@@ -17,10 +17,10 @@ class Pl_RC4: public Pipeline
         unsigned char const* key_data,
         int key_len = -1,
         size_t out_bufsize = def_bufsize);
-    virtual ~Pl_RC4() = default;
+    ~Pl_RC4() override = default;
 
-    virtual void write(unsigned char const* data, size_t len);
-    virtual void finish();
+    void write(unsigned char const* data, size_t len) override;
+    void finish() override;
 
   private:
     std::shared_ptr<unsigned char> outbuf;
diff --git a/libqpdf/qpdf/Pl_SHA2.hh b/libqpdf/qpdf/Pl_SHA2.hh
index 99a19a37..571271eb 100644
--- a/libqpdf/qpdf/Pl_SHA2.hh
+++ b/libqpdf/qpdf/Pl_SHA2.hh
@@ -21,9 +21,9 @@ class Pl_SHA2: public Pipeline
 {
   public:
     Pl_SHA2(int bits = 0, Pipeline* next = nullptr);
-    virtual ~Pl_SHA2() = default;
-    virtual void write(unsigned char const*, size_t);
-    virtual void finish();
+    ~Pl_SHA2() override = default;
+    void write(unsigned char const*, size_t) override;
+    void finish() override;
     void resetBits(int bits);
     std::string getHexDigest();
     std::string getRawDigest();
diff --git a/libqpdf/qpdf/Pl_TIFFPredictor.hh b/libqpdf/qpdf/Pl_TIFFPredictor.hh
index 2b3bdb10..6bc48e72 100644
--- a/libqpdf/qpdf/Pl_TIFFPredictor.hh
+++ b/libqpdf/qpdf/Pl_TIFFPredictor.hh
@@ -18,10 +18,10 @@ class Pl_TIFFPredictor: public Pipeline
         unsigned int columns,
         unsigned int samples_per_pixel = 1,
         unsigned int bits_per_sample = 8);
-    virtual ~Pl_TIFFPredictor() = default;
+    ~Pl_TIFFPredictor() override = default;
 
-    virtual void write(unsigned char const* data, size_t len);
-    virtual void finish();
+    void write(unsigned char const* data, size_t len) override;
+    void finish() override;
 
   private:
     void processRow();
diff --git a/libtests/dct_compress.cc b/libtests/dct_compress.cc
index 2f12aea7..1f969982 100644
--- a/libtests/dct_compress.cc
+++ b/libtests/dct_compress.cc
@@ -22,8 +22,8 @@ class Callback: public Pl_DCT::CompressConfig
         called(false)
     {
     }
-    virtual ~Callback() = default;
-    virtual void apply(jpeg_compress_struct*);
+    ~Callback() override = default;
+    void apply(jpeg_compress_struct*) override;
     bool called;
 };
 
diff --git a/libtests/input_source.cc b/libtests/input_source.cc
index 83744250..9ab41b5d 100644
--- a/libtests/input_source.cc
+++ b/libtests/input_source.cc
@@ -24,8 +24,8 @@ class Finder: public InputSource::Finder
         after(after)
     {
     }
-    virtual ~Finder() = default;
-    virtual bool check();
+    ~Finder() override = default;
+    bool check() override;
 
   private:
     std::shared_ptr<InputSource> is;