Move C-based ProgressReporter helper into QPDFWriter

include/qpdf/QPDFWriter.hh

@@ -29,6 +29,7 @@
 #include <qpdf/DLL.h>
 #include <qpdf/Types.h>
 
+#include <functional>
 #include <list>
 #include <map>
 #include <memory>
@@ -80,7 +81,7 @@ class QPDFWriter
     class QPDF_DLL_CLASS ProgressReporter
     {
       public:
-        virtual ~ProgressReporter() = default;
+        virtual ~ProgressReporter();
 
         // This method is called with a value from 0 to 100 to
         // indicate approximate progress through the write process.
@@ -88,6 +89,20 @@ class QPDFWriter
         virtual void reportProgress(int) = 0;
     };
 
+    // This is a progress reporter that takes a function. It is used
+    // by the C APIs, but it is available if you want to just register
+    // a C function as a handler.
+    class QPDF_DLL_CLASS FunctionProgressReporter: public ProgressReporter
+    {
+      public:
+        FunctionProgressReporter(std::function<void(int)>);
+        virtual ~FunctionProgressReporter();
+        virtual void reportProgress(int) override;
+
+      private:
+        std::function<void(int)> handler;
+    };
+
     // Setting Output.  Output may be set only one time.  If you don't
     // use the filename version of the QPDFWriter constructor, you
     // must call exactly one of these methods.

libqpdf/QPDFWriter.cc

@@ -25,6 +25,30 @@
 #include <algorithm>
 #include <stdlib.h>
 
+QPDFWriter::ProgressReporter::~ProgressReporter()
+{
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
+}
+
+QPDFWriter::FunctionProgressReporter::FunctionProgressReporter(
+    std::function<void(int)> handler) :
+    handler(handler)
+{
+}
+
+QPDFWriter::FunctionProgressReporter::~FunctionProgressReporter()
+{
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
+}
+
+void
+QPDFWriter::FunctionProgressReporter::reportProgress(int progress)
+{
+    this->handler(progress);
+}
+
 QPDFWriter::Members::Members(QPDF& pdf) :
     pdf(pdf),
     filename("unspecified"),

libqpdf/qpdf-c.cc

@@ -61,33 +61,6 @@ _qpdf_data::_qpdf_data() :
 {
 }
 
-namespace
-{
-    class ProgressReporter: public QPDFWriter::ProgressReporter
-    {
-      public:
-        ProgressReporter(void (*handler)(int, void*), void* data);
-        virtual ~ProgressReporter() = default;
-        virtual void reportProgress(int);
-
-      private:
-        void (*handler)(int, void*);
-        void* data;
-    };
-} // namespace
-
-ProgressReporter::ProgressReporter(void (*handler)(int, void*), void* data) :
-    handler(handler),
-    data(data)
-{
-}
-
-void
-ProgressReporter::reportProgress(int progress)
-{
-    this->handler(progress, this->data);
-}
-
 // must set qpdf->filename and qpdf->password
 static void
 call_read(qpdf_data qpdf)
@@ -851,7 +824,8 @@ qpdf_register_progress_reporter(
     QTC::TC("qpdf", "qpdf-c registered progress reporter");
     qpdf->qpdf_writer->registerProgressReporter(
         std::shared_ptr<QPDFWriter::ProgressReporter>(
-            new ProgressReporter(report_progress, data)));
+            new QPDFWriter::FunctionProgressReporter(
+                std::bind(report_progress, std::placeholders::_1, data))));
 }
 
 QPDF_ERROR_CODE

qpdf/sizes.cc

@@ -125,6 +125,7 @@ main()
     print_size(QPDFTokenizer::Token);
     print_size(QPDFUsage);
     print_size(QPDFWriter);
+    print_size(QPDFWriter::FunctionProgressReporter);
     print_size(QPDFXRefEntry);
     return 0;
 }