This one pushes ownership a lot wider.

dw/imgrenderer.hh

@@ -1,6 +1,8 @@
 #ifndef __DW_IMGRENDERER_HH__
 #define __DW_IMGRENDERER_HH__
 
+#include <set>
+
 #ifndef __INCLUDED_FROM_DW_CORE_HH__
 #   error Do not include this file directly, use "core.hh" instead.
 #endif
@@ -58,25 +60,22 @@ public:
  */
 class ImgRendererDist: public ImgRenderer
 {
-   lout::container::typed::HashSet <lout::object::TypedPointer <ImgRenderer> >
-      *children;
+   std::set< std::unique_ptr< ImgRenderer > > children;
 
 public:
-   inline ImgRendererDist ()
-   { children = new lout::container::typed::HashSet
-         <lout::object::TypedPointer <ImgRenderer> > (true); }
-   ~ImgRendererDist () { delete children; }
-
    void setBuffer (core::Imgbuf *buffer, bool resize);
    void drawRow (int row);
    void finish ();
    void fatal ();
 
-   void put (ImgRenderer *child)
-   { children->put (new lout::object::TypedPointer <ImgRenderer> (child)); }
-   void remove (ImgRenderer *child)
-   { lout::object::TypedPointer <ImgRenderer> tp (child);
-     children->remove (&tp); }
+   void put (std::unique_ptr< ImgRenderer > child)
+   { children.insert( std::move( child ) ); }
+	void
+	remove( ImgRenderer * child)
+	{
+		children.erase( std::find_if( begin( children ), end( children ),
+				[&]( const auto &elem ) { return child == elem.get(); } ) );
+	}
 };
 
 } // namespace core