This one pushes ownership a lot wider.

dw/imgrenderer.cc

@@ -27,38 +27,34 @@ using namespace lout::object;
 
 void ImgRendererDist::setBuffer (core::Imgbuf *buffer, bool resize)
 {
-   for (typed::Iterator <TypedPointer <ImgRenderer> > it =
+   for( auto &tp: children )
-           children->iterator (); it.hasNext (); ) {
+   {
-      TypedPointer <ImgRenderer> *tp = it.getNext ();
+      tp->setBuffer (buffer, resize);
-      tp->getTypedValue()->setBuffer (buffer, resize);
    }
 }
 
 void ImgRendererDist::drawRow (int row)
 {
-   for (typed::Iterator <TypedPointer <ImgRenderer> > it =
+   for( auto &tp: children )
-           children->iterator (); it.hasNext (); ) {
+   {
-      TypedPointer <ImgRenderer> *tp = it.getNext ();
+      tp->drawRow (row);
-      tp->getTypedValue()->drawRow (row);
    }
 }
 
 
 void ImgRendererDist::finish ()
 {
-   for (typed::Iterator <TypedPointer <ImgRenderer> > it =
+   for( auto &tp: children )
-           children->iterator (); it.hasNext (); ) {
+   {
-      TypedPointer <ImgRenderer> *tp = it.getNext ();
+      tp->finish ();
-      tp->getTypedValue()->finish ();
    }
 }
 
 void ImgRendererDist::fatal ()
 {
-   for (typed::Iterator <TypedPointer <ImgRenderer> > it =
+   for( auto &tp: children )
-           children->iterator (); it.hasNext (); ) {
+   {
-      TypedPointer <ImgRenderer> *tp = it.getNext ();
+      tp->fatal ();
-      tp->getTypedValue()->fatal ();
    }
 }
 

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> >
+   std::set< std::unique_ptr< ImgRenderer > > children;
-      *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)
+   void put (std::unique_ptr< ImgRenderer > child)
-   { children->put (new lout::object::TypedPointer <ImgRenderer> (child)); }
+   { children.insert( std::move( child ) ); }
-   void remove (ImgRenderer *child)
+	void
-   { lout::object::TypedPointer <ImgRenderer> tp (child);
+	remove( ImgRenderer * child)
-     children->remove (&tp); }
+	{
+		children.erase( std::find_if( begin( children ), end( children ),
+				[&]( const auto &elem ) { return child == elem.get(); } ) );
+	}
 };
 
 } // namespace core

dw/layout.cc

@@ -846,8 +846,8 @@ void Layout::setBgImage (style::StyleImage *bgImage,
       // layout is deleted, "layoutImgRenderer" will be kept, since it
       // is not specific to the style, but only to this layout.
       if (layoutImgRenderer == NULL)
-         layoutImgRenderer = new LayoutImgRenderer (this);
+         layoutImgRenderer = std::make_unique< LayoutImgRenderer >( this ).release();
-      bgImage->putExternalImgRenderer (layoutImgRenderer);
+      bgImage->putExternalImgRenderer( std::unique_ptr< LayoutImgRenderer >{ layoutImgRenderer } );
    }
 }
 

dw/style.cc

@@ -625,8 +625,8 @@ StyleImage::StyleImage ()
    imgbufTiled = NULL;
 
    imgRendererDist = new ImgRendererDist ();
-   styleImgRenderer = new StyleImgRenderer (this);
+   styleImgRenderer= std::make_unique< StyleImgRenderer >( this ).release();
-   imgRendererDist->put (styleImgRenderer);
+   imgRendererDist->put( std::unique_ptr< StyleImgRenderer >{ styleImgRenderer } );
 }
 
 StyleImage::~StyleImage ()

dw/style.hh

@@ -889,8 +889,8 @@ public:
     * \brief Add an additional ImgRenderer, especially used for
     *    drawing.
     */
-   inline void putExternalImgRenderer (ImgRenderer *ir)
+   inline void putExternalImgRenderer (std::unique_ptr< ImgRenderer > ir)
-   { imgRendererDist->put (ir); }
+   { imgRendererDist->put( std::move( ir ) ); }
 
    /**
     * \brief Remove a previously added additional ImgRenderer.

dw/textblock.cc

@@ -1838,9 +1838,9 @@ void Textblock::setWordImgRenderer (int wordNo)
    Word *word = words->getRef (wordNo);
 
    if (word->style->backgroundImage) {
-      word->wordImgRenderer = new WordImgRenderer (this, wordNo);
+      word->wordImgRenderer= std::make_unique< WordImgRenderer >( this, wordNo ).release();
       word->style->backgroundImage->putExternalImgRenderer
-         (word->wordImgRenderer);
+         ( std::unique_ptr< WordImgRenderer >{ word->wordImgRenderer } );
    } else
       word->wordImgRenderer = NULL;
 }
@@ -1862,9 +1862,9 @@ void Textblock::setSpaceImgRenderer (int wordNo)
    Word *word = words->getRef (wordNo);
 
    if (word->spaceStyle->backgroundImage) {
-      word->spaceImgRenderer = new SpaceImgRenderer (this, wordNo);
+      word->spaceImgRenderer= std::make_unique< SpaceImgRenderer >( this, wordNo ).release();
       word->spaceStyle->backgroundImage->putExternalImgRenderer
-         (word->spaceImgRenderer);
+         ( std::unique_ptr< SpaceImgRenderer>{ word->spaceImgRenderer } );
    } else
       word->spaceImgRenderer = NULL;
 }

dw/widget.cc

@@ -1337,8 +1337,8 @@ void Widget::setStyle (style::Style *style)
       // widget is deleted, "widgetImgRenderer" will be kept, since it
       // is not specific to the style, but only to this widget.
       if (widgetImgRenderer == NULL)
-         widgetImgRenderer = new WidgetImgRenderer (this);
+         widgetImgRenderer = std::make_unique< WidgetImgRenderer >( this ).release();
-      style->backgroundImage->putExternalImgRenderer (widgetImgRenderer);
+      style->backgroundImage->putExternalImgRenderer( std::unique_ptr< WidgetImgRenderer >{ widgetImgRenderer } );
    }
 
    if (layout != NULL) {