Update library notes

m-holger
1 parent 5f541754
Showing 1 changed file with 13 additions and 1 deletions
manual/design.rst
@@ -340,7 +340,7 @@ qpdf Object Internals
 ---------------------
  
 The internals of ``QPDFObjectHandle`` and how qpdf stores objects were
-significantly rewritten for qpdf 11. Here are some additional details.
+significantly rewritten for qpdf 11 and 12. Here are some additional details.
  
 Object Internals
 ~~~~~~~~~~~~~~~~
@@ -356,6 +356,9 @@ any changes are reflected.
 Objects in qpdf 11 and Newer
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
+qpdf 11
+.......
+
 The object cache in ``QPDF`` contains a shared pointer to
 ``QPDFObject``. Any ``QPDFObjectHandle`` resolved from an indirect
 reference to that object has a copy of that shared pointer. Each
@@ -391,6 +394,15 @@ operation also has the effect of breaking any circular references
 specification), thus preventing memory leaks when ``QPDF`` objects are
 destroyed.
  
+qpdf 12
+.......
+
+In qpdf 12, the shared pointer to a ``QPDFValue`` contained in each
+``QPDFObject`` was replaced with a ``std::variant``. The base class
+``QPDFValue`` was merged into ``QPDFObject``, and its sub-classes
+became independent classes.
+
+
 Objects prior to qpdf 11
 ~~~~~~~~~~~~~~~~~~~~~~~~