Add ostream << for QPDFObjGen

ChangeLog

@@ -1,3 +1,8 @@
+2020-12-26  Jay Berkenbilt  <ejb@ql.org>
+
+	* Add ostream << for QPDFObjGen. (Don't ask why it took 7.5 years
+	for me to decide to do this.)
+
 2020-12-25  Jay Berkenbilt  <ejb@ql.org>
 
 	* Refactor write code to eliminate an extra full traversal of

include/qpdf/QPDFObjGen.hh

@@ -23,6 +23,7 @@
 #define QPDFOBJGEN_HH
 
 #include <qpdf/DLL.h>
+#include <iostream>
 
 // This class represents an object ID and generation pair.  It is
 // suitable to use as a key in a map or set.
@@ -43,6 +44,9 @@ class QPDFObjGen
     QPDF_DLL
     int getGen() const;
 
+    QPDF_DLL
+    friend std::ostream& operator<<(std::ostream&, const QPDFObjGen&);
+
   private:
     // This class does not use the Members pattern to avoid a memory
     // allocation for every one of these. A lot of these get created

libqpdf/QPDFObjGen.cc

@@ -36,3 +36,9 @@ QPDFObjGen::getGen() const
 {
     return this->gen;
 }
+
+std::ostream& operator<<(std::ostream& os, const QPDFObjGen& og)
+{
+    os << og.obj << "," << og.gen;
+    return os;
+}