Use = default and = delete where possible in classes

README-maintainer

@@ -165,6 +165,18 @@ CODING RULES
   or QPDFDocumentHelper subclasses since there's no reason to use
   dynamic_cast with those.
 
+  IMPORTANT NOTE ABOUT QPDF_DLL_CLASS: On mingw, the vtable for a
+  class with some virtual methods and no pure virtual methods seems
+  often (always?) not to be generated if the destructor is inline or
+  declared with `= default`. Therefore, for any class that is intended
+  to be used as a base class and doesn't contain any pure virtual
+  methods, you must declare the destructor in the header without
+  `= default` and provide a non-inline implementation in the source
+  file. Add this comment to the implementation:
+
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
+
 * Put private member variables in std::shared_ptr<Members> for all
   public classes. Remember to use QPDF_DLL on ~Members(). Exception:
   indirection through std::shared_ptr<Members> is expensive, so don't

TODO

@@ -483,14 +483,10 @@ Comments appear in the code prefixed by "ABI"
 * Switch default --json to latest
 * See where anonymous namespaces can be used to keep things private to
   a source file. Search for `(class|struct)` in **/*.cc.
-* See if we can use constructor delegation instead of init() in
-  classes with overloaded constructors.
 * After removing legacy QPDFNameTreeObjectHelper and
   QPDFNumberTreeObjectHelper constructors, NNTreeImpl can switch to
   having a QPDF reference and assume that the reference is always
   valid.
-* Use `= delete` and `= default` for constructors and destructors
-  where possible
 * Having QPDFObjectHandle setters return Class& to allow for
   use of fluent interfaces. This includes array and dictionary
   mutators.

examples/pdf-count-strings.cc

@@ -32,9 +32,7 @@ class StringCounter: public QPDFObjectHandle::TokenFilter
         count(0)
     {
     }
-    virtual ~StringCounter()
-    {
-    }
+    virtual ~StringCounter() = default;
     virtual void handleToken(QPDFTokenizer::Token const&);
     virtual void handleEOF();
     int getCount() const;

examples/pdf-create.cc

@@ -28,7 +28,7 @@ class ImageProvider: public QPDFObjectHandle::StreamDataProvider
 {
   public:
     ImageProvider(std::string const& color_space, std::string const& filter);
-    virtual ~ImageProvider();
+    virtual ~ImageProvider() = default;
     virtual void
     provideStreamData(int objid, int generation, Pipeline* pipeline);
     size_t getWidth() const;
@@ -80,10 +80,6 @@ ImageProvider::ImageProvider(
     }
 }
 
-ImageProvider::~ImageProvider()
-{
-}
-
 size_t
 ImageProvider::getWidth() const
 {

examples/pdf-filter-tokens.cc

@@ -35,9 +35,7 @@ usage()
 class StringReverser: public QPDFObjectHandle::TokenFilter
 {
   public:
-    virtual ~StringReverser()
-    {
-    }
+    virtual ~StringReverser() = default;
     virtual void handleToken(QPDFTokenizer::Token const&);
 };
 
@@ -70,9 +68,7 @@ StringReverser::handleToken(QPDFTokenizer::Token const& token)
 class ColorToGray: public QPDFObjectHandle::TokenFilter
 {
   public:
-    virtual ~ColorToGray()
-    {
-    }
+    virtual ~ColorToGray() = default;
     virtual void handleToken(QPDFTokenizer::Token const&);
     virtual void handleEOF();
 

examples/pdf-invert-images.cc

@@ -33,9 +33,7 @@ usage()
 class ImageInverter: public QPDFObjectHandle::StreamDataProvider
 {
   public:
-    virtual ~ImageInverter()
-    {
-    }
+    virtual ~ImageInverter() = default;
     virtual void
     provideStreamData(int objid, int generation, Pipeline* pipeline) override;
 

examples/pdf-parse-content.cc

@@ -23,10 +23,7 @@ usage()
 class ParserCallbacks: public QPDFObjectHandle::ParserCallbacks
 {
   public:
-    virtual ~ParserCallbacks()
-    {
-    }
-
+    virtual ~ParserCallbacks() = default;
     virtual void contentSize(size_t);
     virtual void handleObject(QPDFObjectHandle, size_t offset, size_t length);
     virtual void handleEOF();

fuzz/qpdf_fuzzer.cc

@@ -14,9 +14,7 @@
 class DiscardContents: public QPDFObjectHandle::ParserCallbacks
 {
   public:
-    virtual ~DiscardContents()
-    {
-    }
+    virtual ~DiscardContents() = default;
     virtual void
     handleObject(QPDFObjectHandle)
     {

include/qpdf/Buffer.hh

@@ -66,7 +66,7 @@ class Buffer
 
       private:
         Members(size_t size, unsigned char* buf, bool own_memory);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         bool own_memory;
         size_t size;

include/qpdf/BufferInputSource.hh

@@ -60,11 +60,11 @@ class QPDF_DLL_CLASS BufferInputSource: public InputSource
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(bool own_memory, std::string const& description, Buffer* buf);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         bool own_memory;
         std::string description;

include/qpdf/ClosedFileInputSource.hh

@@ -79,7 +79,7 @@ class QPDF_DLL_CLASS ClosedFileInputSource: public InputSource
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(char const* filename);

include/qpdf/FileInputSource.hh

@@ -64,7 +64,7 @@ class QPDF_DLL_CLASS FileInputSource: public InputSource
 
       private:
         Members(bool close_file);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         bool close_file;
         std::string filename;

include/qpdf/InputSource.hh

@@ -42,20 +42,13 @@ class QPDF_DLL_CLASS InputSource
     {
     }
     QPDF_DLL
-    virtual ~InputSource()
-    {
-    }
+    virtual ~InputSource() = default;
 
     class QPDF_DLL_CLASS Finder
     {
       public:
-        Finder()
-        {
-        }
-        virtual ~Finder()
-        {
-        }
-
+        Finder() = default;
+        virtual ~Finder() = default;
         virtual bool check() = 0;
     };
 
@@ -110,11 +103,11 @@ class QPDF_DLL_CLASS InputSource
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/JSON.hh

@@ -150,25 +150,25 @@ class JSON
 
     struct JSON_value
     {
-        virtual ~JSON_value();
+        virtual ~JSON_value() = default;
         virtual std::string unparse(size_t depth) const = 0;
     };
     struct JSON_dictionary: public JSON_value
     {
-        virtual ~JSON_dictionary();
+        virtual ~JSON_dictionary() = default;
         virtual std::string unparse(size_t depth) const;
         std::map<std::string, std::shared_ptr<JSON_value>> members;
     };
     struct JSON_array: public JSON_value
     {
-        virtual ~JSON_array();
+        virtual ~JSON_array() = default;
         virtual std::string unparse(size_t depth) const;
         std::vector<std::shared_ptr<JSON_value>> elements;
     };
     struct JSON_string: public JSON_value
     {
         JSON_string(std::string const& utf8);
-        virtual ~JSON_string();
+        virtual ~JSON_string() = default;
         virtual std::string unparse(size_t depth) const;
         std::string utf8;
         std::string encoded;
@@ -178,20 +178,20 @@ class JSON
         JSON_number(long long val);
         JSON_number(double val);
         JSON_number(std::string const& val);
-        virtual ~JSON_number();
+        virtual ~JSON_number() = default;
         virtual std::string unparse(size_t depth) const;
         std::string encoded;
     };
     struct JSON_bool: public JSON_value
     {
         JSON_bool(bool val);
-        virtual ~JSON_bool();
+        virtual ~JSON_bool() = default;
         virtual std::string unparse(size_t depth) const;
         bool value;
     };
     struct JSON_null: public JSON_value
     {
-        virtual ~JSON_null();
+        virtual ~JSON_null() = default;
         virtual std::string unparse(size_t depth) const;
     };
 
@@ -210,11 +210,11 @@ class JSON
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(std::shared_ptr<JSON_value>);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         std::shared_ptr<JSON_value> value;
     };

include/qpdf/Pipeline.hh

@@ -59,7 +59,7 @@ class QPDF_DLL_CLASS Pipeline
     Pipeline(char const* identifier, Pipeline* next);
 
     QPDF_DLL
-    virtual ~Pipeline();
+    virtual ~Pipeline() = default;
 
     // Subclasses should implement write and finish to do their jobs
     // and then, if they are not end-of-line pipelines, call

include/qpdf/Pl_Buffer.hh

@@ -77,11 +77,11 @@ class QPDF_DLL_CLASS Pl_Buffer: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         bool ready;
         std::shared_ptr<Buffer> data;

include/qpdf/Pl_Concatenate.hh

@@ -56,11 +56,11 @@ class QPDF_DLL_CLASS Pl_Concatenate: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/Pl_Count.hh

@@ -54,11 +54,11 @@ class QPDF_DLL_CLASS Pl_Count: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         // Must be qpdf_offset_t, not size_t, to handle writing more than
         // size_t can handle.

include/qpdf/Pl_DCT.hh

@@ -41,12 +41,8 @@ class QPDF_DLL_CLASS Pl_DCT: public Pipeline
     class QPDF_DLL_CLASS CompressConfig
     {
       public:
-        CompressConfig()
-        {
-        }
-        virtual ~CompressConfig()
-        {
-        }
+        CompressConfig() = default;
+        virtual ~CompressConfig() = default;
         virtual void apply(jpeg_compress_struct*) = 0;
     };
 
@@ -83,7 +79,7 @@ class QPDF_DLL_CLASS Pl_DCT: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(
@@ -94,7 +90,7 @@ class QPDF_DLL_CLASS Pl_DCT: public Pipeline
             int components = 1,
             J_COLOR_SPACE color_space = JCS_GRAYSCALE,
             CompressConfig* config_callback = 0);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         action_e action;
         Pl_Buffer buf;

include/qpdf/Pl_Discard.hh

@@ -49,11 +49,11 @@ class QPDF_DLL_CLASS Pl_Discard: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/Pl_Flate.hh

@@ -80,7 +80,7 @@ class QPDF_DLL_CLASS Pl_Flate: public Pipeline
 
       private:
         Members(size_t out_bufsize, action_e action);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         std::shared_ptr<unsigned char> outbuf;
         size_t out_bufsize;

include/qpdf/Pl_QPDFTokenizer.hh

@@ -66,11 +66,11 @@ class QPDF_DLL_CLASS Pl_QPDFTokenizer: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         QPDFObjectHandle::TokenFilter* filter;
         QPDFTokenizer tokenizer;

include/qpdf/Pl_RunLength.hh

@@ -55,11 +55,11 @@ class QPDF_DLL_CLASS Pl_RunLength: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(action_e);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         action_e action;
         state_e state;

include/qpdf/Pl_StdioFile.hh

@@ -54,11 +54,11 @@ class QPDF_DLL_CLASS Pl_StdioFile: public Pipeline
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(FILE*);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         FILE* file;
     };

include/qpdf/QPDF.hh

@@ -913,9 +913,7 @@ class QPDF
     {
       public:
         CopiedStreamDataProvider(QPDF& destination_qpdf);
-        virtual ~CopiedStreamDataProvider()
-        {
-        }
+        virtual ~CopiedStreamDataProvider() = default;
         virtual bool provideStreamData(
             int objid,
             int generation,
@@ -940,9 +938,7 @@ class QPDF
 
       public:
         StringDecrypter(QPDF* qpdf, int objid, int gen);
-        virtual ~StringDecrypter()
-        {
-        }
+        virtual ~StringDecrypter() = default;
         virtual void decryptString(std::string& val);
 
       private:
@@ -1381,9 +1377,7 @@ class QPDF
             checker(checker)
         {
         }
-        virtual ~PatternFinder()
-        {
-        }
+        virtual ~PatternFinder() = default;
         virtual bool
         check()
         {
@@ -1509,11 +1503,11 @@ class QPDF
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         unsigned long long unique_id;
         QPDFTokenizer tokenizer;

include/qpdf/QPDFAcroFormDocumentHelper.hh

@@ -85,9 +85,7 @@ class QPDFAcroFormDocumentHelper: public QPDFDocumentHelper
     QPDF_DLL
     QPDFAcroFormDocumentHelper(QPDF&);
     QPDF_DLL
-    virtual ~QPDFAcroFormDocumentHelper()
-    {
-    }
+    virtual ~QPDFAcroFormDocumentHelper() = default;
 
     // This class lazily creates an internal cache of the mapping
     // among form fields, annotations, and pages. Methods within this
@@ -291,11 +289,11 @@ class QPDFAcroFormDocumentHelper: public QPDFDocumentHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         bool cache_valid;
         std::map<QPDFObjGen, std::vector<QPDFAnnotationObjectHelper>>

include/qpdf/QPDFAnnotationObjectHelper.hh

@@ -33,9 +33,7 @@ class QPDFAnnotationObjectHelper: public QPDFObjectHelper
     QPDF_DLL
     QPDFAnnotationObjectHelper(QPDFObjectHandle);
     QPDF_DLL
-    virtual ~QPDFAnnotationObjectHelper()
-    {
-    }
+    virtual ~QPDFAnnotationObjectHelper() = default;
 
     // This class provides helper methods for annotations. More
     // functionality will likely be added in the future.
@@ -108,11 +106,11 @@ class QPDFAnnotationObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/QPDFDocumentHelper.hh

@@ -45,9 +45,7 @@ class QPDFDocumentHelper
     {
     }
     QPDF_DLL
-    virtual ~QPDFDocumentHelper()
-    {
-    }
+    virtual ~QPDFDocumentHelper() = default;
     QPDF_DLL
     QPDF&
     getQPDF()

include/qpdf/QPDFEFStreamObjectHelper.hh

@@ -112,7 +112,7 @@ class QPDFEFStreamObjectHelper: public QPDFObjectHelper
         ~Members() = default;
 
       private:
-        Members();
+        Members() = default;
         Members(Members const&) = delete;
     };
 

include/qpdf/QPDFEmbeddedFileDocumentHelper.hh

@@ -85,7 +85,7 @@ class QPDFEmbeddedFileDocumentHelper: public QPDFDocumentHelper
         ~Members() = default;
 
       private:
-        Members();
+        Members() = default;
         Members(Members const&) = delete;
 
         std::shared_ptr<QPDFNameTreeObjectHelper> embedded_files;

include/qpdf/QPDFExc.hh

@@ -40,9 +40,7 @@ class QPDF_DLL_CLASS QPDFExc: public std::runtime_error
         qpdf_offset_t offset,
         std::string const& message);
     QPDF_DLL
-    virtual ~QPDFExc() noexcept
-    {
-    }
+    virtual ~QPDFExc() noexcept = default;
 
     // To get a complete error string, call what(), provided by
     // std::exception.  The accessors below return the original values

include/qpdf/QPDFFileSpecObjectHelper.hh

@@ -109,7 +109,7 @@ class QPDFFileSpecObjectHelper: public QPDFObjectHelper
         ~Members() = default;
 
       private:
-        Members();
+        Members() = default;
         Members(Members const&) = delete;
     };
 

include/qpdf/QPDFFormFieldObjectHelper.hh

@@ -41,9 +41,7 @@ class QPDFFormFieldObjectHelper: public QPDFObjectHelper
     QPDF_DLL
     QPDFFormFieldObjectHelper(QPDFObjectHandle);
     QPDF_DLL
-    virtual ~QPDFFormFieldObjectHelper()
-    {
-    }
+    virtual ~QPDFFormFieldObjectHelper() = default;
 
     QPDF_DLL
     bool isNull();
@@ -229,11 +227,11 @@ class QPDFFormFieldObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/QPDFNameTreeObjectHelper.hh

@@ -62,7 +62,7 @@ class QPDFNameTreeObjectHelper: public QPDFObjectHelper
     static QPDFNameTreeObjectHelper newEmpty(QPDF&, bool auto_repair = true);
 
     QPDF_DLL
-    virtual ~QPDFNameTreeObjectHelper();
+    virtual ~QPDFNameTreeObjectHelper() = default;
 
     // Return whether the number tree has an explicit entry for this
     // number.
@@ -194,7 +194,7 @@ class QPDFNameTreeObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(QPDFObjectHandle& oh, QPDF*, bool auto_repair);

include/qpdf/QPDFNumberTreeObjectHelper.hh

@@ -55,11 +55,8 @@ class QPDFNumberTreeObjectHelper: public QPDFObjectHelper
     [[deprecated("use constructor that takes QPDF&")]] QPDF_DLL
         QPDFNumberTreeObjectHelper(QPDFObjectHandle);
 
-    // ABI: = default
     QPDF_DLL
-    virtual ~QPDFNumberTreeObjectHelper()
-    {
-    }
+    virtual ~QPDFNumberTreeObjectHelper() = default;
 
     // Create an empty number tree
     QPDF_DLL
@@ -217,7 +214,7 @@ class QPDFNumberTreeObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(QPDFObjectHandle& oh, QPDF*, bool auto_repair);

include/qpdf/QPDFObject.hh

@@ -62,9 +62,7 @@ class QPDFObject
     static constexpr object_type_e ot_operator = ::ot_operator;
     static constexpr object_type_e ot_inlineimage = ::ot_inlineimage;
 
-    virtual ~QPDFObject()
-    {
-    }
+    virtual ~QPDFObject() = default;
     virtual std::string unparse() = 0;
     virtual JSON getJSON() = 0;
 

include/qpdf/QPDFObjectHandle.hh

@@ -64,9 +64,7 @@ class QPDFObjectHandle
         StreamDataProvider(bool supports_retry = false);
 
         QPDF_DLL
-        virtual ~StreamDataProvider()
-        {
-        }
+        virtual ~StreamDataProvider();
         // The implementation of this function must write stream data
         // to the given pipeline. The stream data must conform to
         // whatever filters are explicitly associated with the stream.
@@ -172,13 +170,9 @@ class QPDFObjectHandle
     {
       public:
         QPDF_DLL
-        TokenFilter()
-        {
-        }
+        TokenFilter() = default;
         QPDF_DLL
-        virtual ~TokenFilter()
-        {
-        }
+        virtual ~TokenFilter() = default;
         virtual void handleToken(QPDFTokenizer::Token const&) = 0;
         QPDF_DLL
         virtual void handleEOF();
@@ -216,9 +210,7 @@ class QPDFObjectHandle
     {
       public:
         QPDF_DLL
-        virtual ~StringDecrypter()
-        {
-        }
+        virtual ~StringDecrypter() = default;
         virtual void decryptString(std::string& val) = 0;
     };
 
@@ -229,9 +221,7 @@ class QPDFObjectHandle
     {
       public:
         QPDF_DLL
-        virtual ~ParserCallbacks()
-        {
-        }
+        virtual ~ParserCallbacks() = default;
         // One of the handleObject methods must be overridden.
         QPDF_DLL
         virtual void handleObject(QPDFObjectHandle);

include/qpdf/QPDFObjectHelper.hh

@@ -46,9 +46,7 @@ class QPDFObjectHelper
     {
     }
     QPDF_DLL
-    virtual ~QPDFObjectHelper()
-    {
-    }
+    virtual ~QPDFObjectHelper() = default;
     QPDF_DLL
     QPDFObjectHandle
     getObjectHandle()

include/qpdf/QPDFOutlineDocumentHelper.hh

@@ -45,7 +45,7 @@ class QPDFOutlineDocumentHelper: public QPDFDocumentHelper
     QPDF_DLL
     QPDFOutlineDocumentHelper(QPDF&);
     QPDF_DLL
-    virtual ~QPDFOutlineDocumentHelper();
+    virtual ~QPDFOutlineDocumentHelper() = default;
 
     QPDF_DLL
     bool hasOutlines();
@@ -88,11 +88,11 @@ class QPDFOutlineDocumentHelper: public QPDFDocumentHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
 
         std::vector<QPDFOutlineObjectHelper> outlines;
         std::set<QPDFObjGen> seen;

include/qpdf/QPDFOutlineObjectHelper.hh

@@ -105,11 +105,11 @@ class QPDFOutlineObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members(QPDFOutlineDocumentHelper& dh);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         QPDFOutlineDocumentHelper& dh;
         std::shared_ptr<QPDFOutlineObjectHelper> parent;

include/qpdf/QPDFPageDocumentHelper.hh

@@ -40,9 +40,7 @@ class QPDFPageDocumentHelper: public QPDFDocumentHelper
     QPDF_DLL
     QPDFPageDocumentHelper(QPDF&);
     QPDF_DLL
-    virtual ~QPDFPageDocumentHelper()
-    {
-    }
+    virtual ~QPDFPageDocumentHelper() = default;
 
     // Traverse page tree, and return all /Page objects wrapped in
     // QPDFPageObjectHelper objects. Unlike with
@@ -144,11 +142,11 @@ class QPDFPageDocumentHelper: public QPDFDocumentHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/QPDFPageLabelDocumentHelper.hh

@@ -50,9 +50,7 @@ class QPDFPageLabelDocumentHelper: public QPDFDocumentHelper
     QPDF_DLL
     QPDFPageLabelDocumentHelper(QPDF&);
     QPDF_DLL
-    virtual ~QPDFPageLabelDocumentHelper()
-    {
-    }
+    virtual ~QPDFPageLabelDocumentHelper() = default;
 
     QPDF_DLL
     bool hasPageLabels();
@@ -90,11 +88,11 @@ class QPDFPageLabelDocumentHelper: public QPDFDocumentHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
 
         std::shared_ptr<QPDFNumberTreeObjectHelper> labels;
     };

include/qpdf/QPDFPageObjectHelper.hh

@@ -43,9 +43,7 @@ class QPDFPageObjectHelper: public QPDFObjectHelper
     QPDF_DLL
     QPDFPageObjectHelper(QPDFObjectHandle);
     QPDF_DLL
-    virtual ~QPDFPageObjectHelper()
-    {
-    }
+    virtual ~QPDFPageObjectHelper() = default;
 
     // Works with pages and form XObjects. Return the effective value
     // of this attribute for the page/form XObject. For pages, if the
@@ -384,11 +382,11 @@ class QPDFPageObjectHelper: public QPDFObjectHelper
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
-        Members();
-        Members(Members const&);
+        Members() = default;
+        Members(Members const&) = delete;
     };
 
     std::shared_ptr<Members> m;

include/qpdf/QPDFSystemError.hh

@@ -35,7 +35,7 @@ class QPDF_DLL_CLASS QPDFSystemError: public std::runtime_error
     QPDF_DLL
     QPDFSystemError(std::string const& description, int system_errno);
     QPDF_DLL
-    virtual ~QPDFSystemError() noexcept;
+    virtual ~QPDFSystemError() noexcept = default;
 
     // To get a complete error string, call what(), provided by
     // std::exception.  The accessors below return the original values

include/qpdf/QPDFTokenizer.hh

@@ -217,11 +217,11 @@ class QPDFTokenizer
 
       public:
         QPDF_DLL
-        ~Members();
+        ~Members() = default;
 
       private:
         Members();
-        Members(Members const&);
+        Members(Members const&) = delete;
         void reset();
 
         // Lexer state

include/qpdf/QPDFWriter.hh

@@ -75,14 +75,12 @@ class QPDFWriter
     QPDFWriter(QPDF& pdf, char const* description, FILE* file, bool close_file);
 
     QPDF_DLL
-    ~QPDFWriter();
+    ~QPDFWriter() = default;
 
     class QPDF_DLL_CLASS ProgressReporter
     {
       public:
-        virtual ~ProgressReporter()
-        {
-        }
+        virtual ~ProgressReporter() = default;
 
         // This method is called with a value from 0 to 100 to
         // indicate approximate progress through the write process.
@@ -718,7 +716,7 @@ class QPDFWriter
 
       private:
         Members(QPDF& pdf);
-        Members(Members const&);
+        Members(Members const&) = delete;
 
         QPDF& pdf;
         char const* filename;

include/qpdf/RandomDataProvider.hh

@@ -28,9 +28,7 @@
 class QPDF_DLL_CLASS RandomDataProvider
 {
   public:
-    virtual ~RandomDataProvider()
-    {
-    }
+    virtual ~RandomDataProvider() = default;
     virtual void provideRandomData(unsigned char* data, size_t len) = 0;
 
   protected:

libqpdf/AES_PDF_native.cc

@@ -36,10 +36,6 @@ AES_PDF_native::AES_PDF_native(
     }
 }
 
-AES_PDF_native::~AES_PDF_native()
-{
-}
-
 void
 AES_PDF_native::update(unsigned char* in_data, unsigned char* out_data)
 {

libqpdf/BufferInputSource.cc

@@ -17,10 +17,6 @@ BufferInputSource::Members::Members(
 {
 }
 
-BufferInputSource::Members::~Members()
-{
-}
-
 BufferInputSource::BufferInputSource(
     std::string const& description, Buffer* buf, bool own_memory) :
     m(new Members(own_memory, description, buf))

libqpdf/ClosedFileInputSource.cc

@@ -9,10 +9,6 @@ ClosedFileInputSource::Members::Members(char const* filename) :
 {
 }
 
-ClosedFileInputSource::Members::~Members()
-{
-}
-
 ClosedFileInputSource::ClosedFileInputSource(char const* filename) :
     m(new Members(filename))
 {
@@ -20,6 +16,8 @@ ClosedFileInputSource::ClosedFileInputSource(char const* filename) :
 
 ClosedFileInputSource::~ClosedFileInputSource()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/ContentNormalizer.cc

@@ -8,10 +8,6 @@ ContentNormalizer::ContentNormalizer() :
 {
 }
 
-ContentNormalizer::~ContentNormalizer()
-{
-}
-
 void
 ContentNormalizer::handleToken(QPDFTokenizer::Token const& token)
 {

libqpdf/CryptoRandomDataProvider.cc

@@ -2,14 +2,6 @@
 
 #include <qpdf/QPDFCryptoProvider.hh>
 
-CryptoRandomDataProvider::CryptoRandomDataProvider()
-{
-}
-
-CryptoRandomDataProvider::~CryptoRandomDataProvider()
-{
-}
-
 void
 CryptoRandomDataProvider::provideRandomData(unsigned char* data, size_t len)
 {

libqpdf/FileInputSource.cc

@@ -42,6 +42,8 @@ FileInputSource::setFile(char const* description, FILE* filep, bool close_file)
 
 FileInputSource::~FileInputSource()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 qpdf_offset_t

libqpdf/InputSource.cc

@@ -5,14 +5,6 @@
 #include <stdexcept>
 #include <string.h>
 
-InputSource::Members::Members()
-{
-}
-
-InputSource::Members::~Members()
-{
-}
-
 void
 InputSource::setLastOffset(qpdf_offset_t offset)
 {

libqpdf/InsecureRandomDataProvider.cc

@@ -9,10 +9,6 @@ InsecureRandomDataProvider::InsecureRandomDataProvider() :
 {
 }
 
-InsecureRandomDataProvider::~InsecureRandomDataProvider()
-{
-}
-
 void
 InsecureRandomDataProvider::provideRandomData(unsigned char* data, size_t len)
 {

libqpdf/JSON.cc

@@ -5,10 +5,6 @@
 #include <cstring>
 #include <stdexcept>
 
-JSON::Members::~Members()
-{
-}
-
 JSON::Members::Members(std::shared_ptr<JSON_value> value) :
     value(value)
 {
@@ -19,14 +15,6 @@ JSON::JSON(std::shared_ptr<JSON_value> value) :
 {
 }
 
-JSON::JSON_value::~JSON_value()
-{
-}
-
-JSON::JSON_dictionary::~JSON_dictionary()
-{
-}
-
 std::string
 JSON::JSON_dictionary::unparse(size_t depth) const
 {
@@ -51,10 +39,6 @@ JSON::JSON_dictionary::unparse(size_t depth) const
     return result;
 }
 
-JSON::JSON_array::~JSON_array()
-{
-}
-
 std::string
 JSON::JSON_array::unparse(size_t depth) const
 {
@@ -84,10 +68,6 @@ JSON::JSON_string::JSON_string(std::string const& utf8) :
 {
 }
 
-JSON::JSON_string::~JSON_string()
-{
-}
-
 std::string
 JSON::JSON_string::unparse(size_t) const
 {
@@ -109,10 +89,6 @@ JSON::JSON_number::JSON_number(std::string const& value) :
 {
 }
 
-JSON::JSON_number::~JSON_number()
-{
-}
-
 std::string
 JSON::JSON_number::unparse(size_t) const
 {
@@ -124,20 +100,12 @@ JSON::JSON_bool::JSON_bool(bool val) :
 {
 }
 
-JSON::JSON_bool::~JSON_bool()
-{
-}
-
 std::string
 JSON::JSON_bool::unparse(size_t) const
 {
     return value ? "true" : "false";
 }
 
-JSON::JSON_null::~JSON_null()
-{
-}
-
 std::string
 JSON::JSON_null::unparse(size_t) const
 {

libqpdf/JSONHandler.cc

@@ -9,10 +9,6 @@ JSONHandler::JSONHandler() :
 {
 }
 
-JSONHandler::Members::Members()
-{
-}
-
 void
 JSONHandler::usage(std::string const& msg)
 {

libqpdf/OffsetInputSource.cc

@@ -17,10 +17,6 @@ OffsetInputSource::OffsetInputSource(
         std::numeric_limits<qpdf_offset_t>::max() - global_offset;
 }
 
-OffsetInputSource::~OffsetInputSource()
-{
-}
-
 qpdf_offset_t
 OffsetInputSource::findAndSkipNextEOL()
 {

libqpdf/Pipeline.cc

@@ -8,10 +8,6 @@ Pipeline::Pipeline(char const* identifier, Pipeline* next) :
 {
 }
 
-Pipeline::~Pipeline()
-{
-}
-
 Pipeline*
 Pipeline::getNext(bool allow_null)
 {

libqpdf/Pl_AES_PDF.cc

@@ -35,10 +35,6 @@ Pl_AES_PDF::Pl_AES_PDF(
     std::memset(this->cbc_block, 0, this->buf_size);
 }
 
-Pl_AES_PDF::~Pl_AES_PDF()
-{
-}
-
 void
 Pl_AES_PDF::useZeroIV()
 {

libqpdf/Pl_ASCII85Decoder.cc

@@ -12,10 +12,6 @@ Pl_ASCII85Decoder::Pl_ASCII85Decoder(char const* identifier, Pipeline* next) :
     memset(this->inbuf, 117, 5);
 }
 
-Pl_ASCII85Decoder::~Pl_ASCII85Decoder()
-{
-}
-
 void
 Pl_ASCII85Decoder::write(unsigned char* buf, size_t len)
 {

libqpdf/Pl_ASCIIHexDecoder.cc

@@ -15,10 +15,6 @@ Pl_ASCIIHexDecoder::Pl_ASCIIHexDecoder(char const* identifier, Pipeline* next) :
     this->inbuf[2] = '\0';
 }
 
-Pl_ASCIIHexDecoder::~Pl_ASCIIHexDecoder()
-{
-}
-
 void
 Pl_ASCIIHexDecoder::write(unsigned char* buf, size_t len)
 {

libqpdf/Pl_Buffer.cc

@@ -12,10 +12,6 @@ Pl_Buffer::Members::Members() :
 {
 }
 
-Pl_Buffer::Members::~Members()
-{
-}
-
 Pl_Buffer::Pl_Buffer(char const* identifier, Pipeline* next) :
     Pipeline(identifier, next),
     m(new Members())
@@ -24,6 +20,8 @@ Pl_Buffer::Pl_Buffer(char const* identifier, Pipeline* next) :
 
 Pl_Buffer::~Pl_Buffer()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_Concatenate.cc

@@ -1,13 +1,5 @@
 #include <qpdf/Pl_Concatenate.hh>
 
-Pl_Concatenate::Members::Members()
-{
-}
-
-Pl_Concatenate::Members::~Members()
-{
-}
-
 Pl_Concatenate::Pl_Concatenate(char const* identifier, Pipeline* next) :
     Pipeline(identifier, next)
 {
@@ -15,6 +7,8 @@ Pl_Concatenate::Pl_Concatenate(char const* identifier, Pipeline* next) :
 
 Pl_Concatenate::~Pl_Concatenate()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_Count.cc

@@ -8,10 +8,6 @@ Pl_Count::Members::Members() :
 {
 }
 
-Pl_Count::Members::~Members()
-{
-}
-
 Pl_Count::Pl_Count(char const* identifier, Pipeline* next) :
     Pipeline(identifier, next),
     m(new Members())
@@ -20,6 +16,8 @@ Pl_Count::Pl_Count(char const* identifier, Pipeline* next) :
 
 Pl_Count::~Pl_Count()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_DCT.cc

@@ -50,10 +50,6 @@ Pl_DCT::Members::Members(
 {
 }
 
-Pl_DCT::Members::~Members()
-{
-}
-
 Pl_DCT::Pl_DCT(char const* identifier, Pipeline* next) :
     Pipeline(identifier, next),
     m(new Members(a_decompress, "DCT compressed image"))
@@ -82,6 +78,8 @@ Pl_DCT::Pl_DCT(
 
 Pl_DCT::~Pl_DCT()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_Discard.cc

@@ -2,14 +2,6 @@
 
 // Exercised in md5 test suite
 
-Pl_Discard::Members::Members()
-{
-}
-
-Pl_Discard::Members::~Members()
-{
-}
-
 Pl_Discard::Pl_Discard() :
     Pipeline("discard", 0)
 {
@@ -17,6 +9,8 @@ Pl_Discard::Pl_Discard() :
 
 Pl_Discard::~Pl_Discard()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_Flate.cc

@@ -65,6 +65,8 @@ Pl_Flate::Pl_Flate(
 
 Pl_Flate::~Pl_Flate()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_LZWDecoder.cc

@@ -22,10 +22,6 @@ Pl_LZWDecoder::Pl_LZWDecoder(
     memset(buf, 0, 3);
 }
 
-Pl_LZWDecoder::~Pl_LZWDecoder()
-{
-}
-
 void
 Pl_LZWDecoder::write(unsigned char* bytes, size_t len)
 {

libqpdf/Pl_MD5.cc

@@ -10,10 +10,6 @@ Pl_MD5::Pl_MD5(char const* identifier, Pipeline* next) :
 {
 }
 
-Pl_MD5::~Pl_MD5()
-{
-}
-
 void
 Pl_MD5::write(unsigned char* buf, size_t len)
 {

libqpdf/Pl_PNGFilter.cc

@@ -61,10 +61,6 @@ Pl_PNGFilter::Pl_PNGFilter(
         (action == a_encode ? this->bytes_per_row : this->bytes_per_row + 1);
 }
 
-Pl_PNGFilter::~Pl_PNGFilter()
-{
-}
-
 void
 Pl_PNGFilter::write(unsigned char* data, size_t len)
 {

libqpdf/Pl_QPDFTokenizer.cc

@@ -12,10 +12,6 @@ Pl_QPDFTokenizer::Members::Members() :
 {
 }
 
-Pl_QPDFTokenizer::Members::~Members()
-{
-}
-
 Pl_QPDFTokenizer::Pl_QPDFTokenizer(
     char const* identifier,
     QPDFObjectHandle::TokenFilter* filter,
@@ -32,6 +28,8 @@ Pl_QPDFTokenizer::Pl_QPDFTokenizer(
 
 Pl_QPDFTokenizer::~Pl_QPDFTokenizer()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_RC4.cc

@@ -15,10 +15,6 @@ Pl_RC4::Pl_RC4(
     this->outbuf = QUtil::make_shared_array<unsigned char>(out_bufsize);
 }
 
-Pl_RC4::~Pl_RC4()
-{
-}
-
 void
 Pl_RC4::write(unsigned char* data, size_t len)
 {

libqpdf/Pl_RunLength.cc

@@ -10,10 +10,6 @@ Pl_RunLength::Members::Members(action_e action) :
 {
 }
 
-Pl_RunLength::Members::~Members()
-{
-}
-
 Pl_RunLength::Pl_RunLength(
     char const* identifier, Pipeline* next, action_e action) :
     Pipeline(identifier, next),
@@ -23,6 +19,8 @@ Pl_RunLength::Pl_RunLength(
 
 Pl_RunLength::~Pl_RunLength()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_SHA2.cc

@@ -14,10 +14,6 @@ Pl_SHA2::Pl_SHA2(int bits, Pipeline* next) :
     }
 }
 
-Pl_SHA2::~Pl_SHA2()
-{
-}
-
 void
 Pl_SHA2::write(unsigned char* buf, size_t len)
 {

libqpdf/Pl_StdioFile.cc

@@ -11,10 +11,6 @@ Pl_StdioFile::Members::Members(FILE* f) :
 {
 }
 
-Pl_StdioFile::Members::~Members()
-{
-}
-
 Pl_StdioFile::Pl_StdioFile(char const* identifier, FILE* f) :
     Pipeline(identifier, 0),
     m(new Members(f))
@@ -23,6 +19,8 @@ Pl_StdioFile::Pl_StdioFile(char const* identifier, FILE* f) :
 
 Pl_StdioFile::~Pl_StdioFile()
 {
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
 }
 
 void

libqpdf/Pl_TIFFPredictor.cc

@@ -45,10 +45,6 @@ Pl_TIFFPredictor::Pl_TIFFPredictor(
     memset(this->cur_row.get(), 0, this->bytes_per_row);
 }
 
-Pl_TIFFPredictor::~Pl_TIFFPredictor()
-{
-}
-
 void
 Pl_TIFFPredictor::write(unsigned char* data, size_t len)
 {

libqpdf/QPDF.cc

@@ -230,10 +230,6 @@ QPDF::Members::Members() :
 {
 }
 
-QPDF::Members::~Members()
-{
-}
-
 QPDF::QPDF() :
     m(new Members())
 {

libqpdf/QPDFAcroFormDocumentHelper.cc

@@ -6,10 +6,6 @@
 #include <qpdf/QUtil.hh>
 #include <qpdf/ResourceFinder.hh>
 
-QPDFAcroFormDocumentHelper::Members::~Members()
-{
-}
-
 QPDFAcroFormDocumentHelper::Members::Members() :
     cache_valid(false)
 {

libqpdf/QPDFAnnotationObjectHelper.cc

@@ -6,14 +6,6 @@
 #include <qpdf/QTC.hh>
 #include <qpdf/QUtil.hh>
 
-QPDFAnnotationObjectHelper::Members::~Members()
-{
-}
-
-QPDFAnnotationObjectHelper::Members::Members()
-{
-}
-
 QPDFAnnotationObjectHelper::QPDFAnnotationObjectHelper(QPDFObjectHandle oh) :
     QPDFObjectHelper(oh)
 {

libqpdf/QPDFEFStreamObjectHelper.cc

@@ -12,10 +12,6 @@ QPDFEFStreamObjectHelper::QPDFEFStreamObjectHelper(QPDFObjectHandle oh) :
 {
 }
 
-QPDFEFStreamObjectHelper::Members::Members()
-{
-}
-
 QPDFObjectHandle
 QPDFEFStreamObjectHelper::getParam(std::string const& pkey)
 {

libqpdf/QPDFEmbeddedFileDocumentHelper.cc

@@ -47,10 +47,6 @@ QPDFEmbeddedFileDocumentHelper::QPDFEmbeddedFileDocumentHelper(QPDF& qpdf) :
     }
 }
 
-QPDFEmbeddedFileDocumentHelper::Members::Members()
-{
-}
-
 bool
 QPDFEmbeddedFileDocumentHelper::hasEmbeddedFiles() const
 {

libqpdf/QPDFFileSpecObjectHelper.cc

@@ -19,10 +19,6 @@ QPDFFileSpecObjectHelper::QPDFFileSpecObjectHelper(QPDFObjectHandle oh) :
     }
 }
 
-QPDFFileSpecObjectHelper::Members::Members()
-{
-}
-
 static std::vector<std::string> name_keys = {
     "/UF", "/F", "/Unix", "/DOS", "/Mac"};
 

libqpdf/QPDFFormFieldObjectHelper.cc

@@ -8,14 +8,6 @@
 #include <qpdf/QUtil.hh>
 #include <stdlib.h>
 
-QPDFFormFieldObjectHelper::Members::~Members()
-{
-}
-
-QPDFFormFieldObjectHelper::Members::Members()
-{
-}
-
 QPDFFormFieldObjectHelper::QPDFFormFieldObjectHelper(QPDFObjectHandle oh) :
     QPDFObjectHelper(oh),
     m(new Members())
@@ -525,9 +517,7 @@ class ValueSetter: public QPDFObjectHandle::TokenFilter
         std::vector<std::string> const& opt,
         double tf,
         QPDFObjectHandle::Rectangle const& bbox);
-    virtual ~ValueSetter()
-    {
-    }
+    virtual ~ValueSetter() = default;
     virtual void handleToken(QPDFTokenizer::Token const&);
     virtual void handleEOF();
     void writeAppearance();

libqpdf/QPDFJob.cc

@@ -46,9 +46,7 @@ namespace
             size_t oi_min_height,
             size_t oi_min_area,
             QPDFObjectHandle& image);
-        virtual ~ImageOptimizer()
-        {
-        }
+        virtual ~ImageOptimizer() = default;
         virtual void
         provideStreamData(int objid, int generation, Pipeline* pipeline);
         std::shared_ptr<Pipeline>
@@ -66,9 +64,7 @@ namespace
     class DiscardContents: public QPDFObjectHandle::ParserCallbacks
     {
       public:
-        virtual ~DiscardContents()
-        {
-        }
+        virtual ~DiscardContents() = default;
         virtual void
         handleObject(QPDFObjectHandle)
         {
@@ -103,10 +99,7 @@ namespace
             filename(filename)
         {
         }
-        virtual ~ProgressReporter()
-        {
-        }
-
+        virtual ~ProgressReporter() = default;
         virtual void reportProgress(int);
 
       private:

libqpdf/QPDFNameTreeObjectHelper.cc

@@ -31,10 +31,6 @@ class NameTreeDetails: public NNTreeDetails
 
 static NameTreeDetails name_tree_details;
 
-QPDFNameTreeObjectHelper::Members::~Members()
-{
-}
-
 QPDFNameTreeObjectHelper::Members::Members(
     QPDFObjectHandle& oh, QPDF* q, bool auto_repair) :
     impl(std::make_shared<NNTreeImpl>(name_tree_details, q, oh, auto_repair))
@@ -54,10 +50,6 @@ QPDFNameTreeObjectHelper::QPDFNameTreeObjectHelper(QPDFObjectHandle oh) :
 {
 }
 
-QPDFNameTreeObjectHelper::~QPDFNameTreeObjectHelper()
-{
-}
-
 QPDFNameTreeObjectHelper
 QPDFNameTreeObjectHelper::newEmpty(QPDF& qpdf, bool auto_repair)
 {

libqpdf/QPDFNumberTreeObjectHelper.cc

@@ -32,10 +32,6 @@ class NumberTreeDetails: public NNTreeDetails
 
 static NumberTreeDetails number_tree_details;
 
-QPDFNumberTreeObjectHelper::Members::~Members()
-{
-}
-
 QPDFNumberTreeObjectHelper::Members::Members(
     QPDFObjectHandle& oh, QPDF* q, bool auto_repair) :
     impl(std::make_shared<NNTreeImpl>(number_tree_details, q, oh, auto_repair))

libqpdf/QPDFObjectHandle.cc

@@ -41,6 +41,12 @@ QPDFObjectHandle::StreamDataProvider::StreamDataProvider(bool supports_retry) :
 {
 }
 
+QPDFObjectHandle::StreamDataProvider::~StreamDataProvider()
+{
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
+}
+
 void
 QPDFObjectHandle::StreamDataProvider::provideStreamData(
     int objid, int generation, Pipeline* pipeline)
@@ -77,9 +83,7 @@ class CoalesceProvider: public QPDFObjectHandle::StreamDataProvider
         old_contents(old_contents)
     {
     }
-    virtual ~CoalesceProvider()
-    {
-    }
+    virtual ~CoalesceProvider() = default;
     virtual void
     provideStreamData(int objid, int generation, Pipeline* pipeline);
 

libqpdf/QPDFOutlineDocumentHelper.cc

@@ -2,14 +2,6 @@
 
 #include <qpdf/QTC.hh>
 
-QPDFOutlineDocumentHelper::Members::~Members()
-{
-}
-
-QPDFOutlineDocumentHelper::Members::Members()
-{
-}
-
 QPDFOutlineDocumentHelper::QPDFOutlineDocumentHelper(QPDF& qpdf) :
     QPDFDocumentHelper(qpdf),
     m(new Members())
@@ -36,10 +28,6 @@ QPDFOutlineDocumentHelper::QPDFOutlineDocumentHelper(QPDF& qpdf) :
     }
 }
 
-QPDFOutlineDocumentHelper::~QPDFOutlineDocumentHelper()
-{
-}
-
 bool
 QPDFOutlineDocumentHelper::hasOutlines()
 {

libqpdf/QPDFOutlineObjectHelper.cc

@@ -3,10 +3,6 @@
 #include <qpdf/QPDFOutlineDocumentHelper.hh>
 #include <qpdf/QTC.hh>
 
-QPDFOutlineObjectHelper::Members::~Members()
-{
-}
-
 QPDFOutlineObjectHelper::Members::Members(QPDFOutlineDocumentHelper& dh) :
     dh(dh)
 {

libqpdf/QPDFPageDocumentHelper.cc

@@ -4,14 +4,6 @@
 #include <qpdf/QTC.hh>
 #include <qpdf/QUtil.hh>
 
-QPDFPageDocumentHelper::Members::~Members()
-{
-}
-
-QPDFPageDocumentHelper::Members::Members()
-{
-}
-
 QPDFPageDocumentHelper::QPDFPageDocumentHelper(QPDF& qpdf) :
     QPDFDocumentHelper(qpdf)
 {

libqpdf/QPDFPageLabelDocumentHelper.cc

@@ -2,14 +2,6 @@
 
 #include <qpdf/QTC.hh>
 
-QPDFPageLabelDocumentHelper::Members::~Members()
-{
-}
-
-QPDFPageLabelDocumentHelper::Members::Members()
-{
-}
-
 QPDFPageLabelDocumentHelper::QPDFPageLabelDocumentHelper(QPDF& qpdf) :
     QPDFDocumentHelper(qpdf),
     m(new Members())

libqpdf/QPDFPageObjectHelper.cc

@@ -18,9 +18,7 @@ class ContentProvider: public QPDFObjectHandle::StreamDataProvider
         from_page(from_page)
     {
     }
-    virtual ~ContentProvider()
-    {
-    }
+    virtual ~ContentProvider() = default;
     virtual void
     provideStreamData(int objid, int generation, Pipeline* pipeline);
 
@@ -45,9 +43,7 @@ class InlineImageTracker: public QPDFObjectHandle::TokenFilter
 {
   public:
     InlineImageTracker(QPDF*, size_t min_size, QPDFObjectHandle resources);
-    virtual ~InlineImageTracker()
-    {
-    }
+    virtual ~InlineImageTracker() = default;
     virtual void handleToken(QPDFTokenizer::Token const&);
     QPDFObjectHandle convertIIDict(QPDFObjectHandle odict);
 
@@ -230,14 +226,6 @@ InlineImageTracker::handleToken(QPDFTokenizer::Token const& token)
     }
 }
 
-QPDFPageObjectHelper::Members::~Members()
-{
-}
-
-QPDFPageObjectHelper::Members::Members()
-{
-}
-
 QPDFPageObjectHelper::QPDFPageObjectHelper(QPDFObjectHandle oh) :
     QPDFObjectHelper(oh)
 {

libqpdf/QPDFSystemError.cc

@@ -11,10 +11,6 @@ QPDFSystemError::QPDFSystemError(
 {
 }
 
-QPDFSystemError::~QPDFSystemError() noexcept
-{
-}
-
 std::string
 QPDFSystemError::createWhat(std::string const& description, int system_errno)
 {

libqpdf/QPDFTokenizer.cc

@@ -29,9 +29,7 @@ class QPDFWordTokenFinder: public InputSource::Finder
         str(str)
     {
     }
-    virtual ~QPDFWordTokenFinder()
-    {
-    }
+    virtual ~QPDFWordTokenFinder() = default;
     virtual bool check();
 
   private:
@@ -96,10 +94,6 @@ QPDFTokenizer::Members::reset()
     last_char_was_cr = false;
 }
 
-QPDFTokenizer::Members::~Members()
-{
-}
-
 QPDFTokenizer::Token::Token(token_type_e type, std::string const& value) :
     type(type),
     value(value),

libqpdf/QPDFWriter.cc

@@ -100,10 +100,6 @@ QPDFWriter::QPDFWriter(
     setOutputFile(description, file, close_file);
 }
 
-QPDFWriter::~QPDFWriter()
-{
-}
-
 void
 QPDFWriter::setOutputFilename(char const* filename)
 {

libqpdf/QPDF_Array.cc

@@ -14,10 +14,6 @@ QPDF_Array::QPDF_Array(SparseOHArray const& items) :
 {
 }
 
-QPDF_Array::~QPDF_Array()
-{
-}
-
 void
 QPDF_Array::releaseResolved()
 {

libqpdf/QPDF_Bool.cc

@@ -5,10 +5,6 @@ QPDF_Bool::QPDF_Bool(bool val) :
 {
 }
 
-QPDF_Bool::~QPDF_Bool()
-{
-}
-
 std::string
 QPDF_Bool::unparse()
 {

libqpdf/QPDF_Dictionary.cc

@@ -9,10 +9,6 @@ QPDF_Dictionary::QPDF_Dictionary(
 {
 }
 
-QPDF_Dictionary::~QPDF_Dictionary()
-{
-}
-
 void
 QPDF_Dictionary::releaseResolved()
 {

libqpdf/QPDF_InlineImage.cc

@@ -7,10 +7,6 @@ QPDF_InlineImage::QPDF_InlineImage(std::string const& val) :
 {
 }
 
-QPDF_InlineImage::~QPDF_InlineImage()
-{
-}
-
 std::string
 QPDF_InlineImage::unparse()
 {