Removed some manual management.

Apparently, the layout engine is written in something resembling
either Java or Google's G+.  It's "C++", but there's no exceptions,
manual memory management, etc.  But it's also attempting to recreate
a subset of the Java Collections framework in C++.  It's a common
pattern in both beginner and older C++.

I'll completely replace all of this with standard C++ library types.

dw/layout.cc

@@ -287,9 +287,6 @@ Layout::Layout (Platform *platform, bool limit)
    scrollIdleId = -1;
    scrollIdleNotInterrupted = false;
 
-   anchorsTable =
-      new container::typed::HashTable <object::String, Anchor> (true, true);
-
    resizeIdleId = -1;
 
    textZone = new misc::ZoneAllocator (16 * 1024);
@@ -339,7 +336,6 @@ Layout::~Layout ()
    delete queueResizeList;
    delete platform;
    delete view;
-   delete anchorsTable;
    delete textZone;
 
    if (requestedAnchor)
@@ -755,26 +751,24 @@ char *Layout::addAnchor (Widget *widget, const char* name)
 
 char *Layout::addAnchor (Widget *widget, const char* name, int y)
 {
-   String key (name);
+   if (anchorsTable.contains (name))
-   if (anchorsTable->contains (&key))
       return NULL;
    else {
-      Anchor *anchor = new Anchor ();
+      auto anchor = std::make_unique< Anchor >();
-      anchor->name = dStrdup (name);
+      char *const rv= anchor->name = dStrdup (name);
       anchor->widget = widget;
       anchor->y = y;
 
-      anchorsTable->put (new String (name), anchor);
+      anchorsTable[ name ]= std::move( anchor );
       updateAnchor ();
 
-      return anchor->name;
+      return rv;
    }
 }
 
 void Layout::changeAnchor (Widget *widget, char* name, int y)
 {
-   String key (name);
+   Anchor *const anchor = anchorsTable.at( name ).get();
-   Anchor *anchor = anchorsTable->get (&key);
    assert (anchor);
    assert (anchor->widget == widget);
    anchor->y = y;
@@ -783,18 +777,16 @@ void Layout::changeAnchor (Widget *widget, char* name, int y)
 
 void Layout::removeAnchor (Widget *widget, char* name)
 {
-   String key (name);
+   anchorsTable.erase( name );
-   anchorsTable->remove (&key);
 }
 
 void Layout::updateAnchor ()
 {
-   Anchor *anchor;
+   Anchor *anchor= nullptr;
-   if (requestedAnchor) {
+   if (requestedAnchor and anchorsTable.contains( requestedAnchor ) )
-      String key (requestedAnchor);
+   {
-      anchor = anchorsTable->get (&key);
+      anchor= anchorsTable[ requestedAnchor ].get();
-   } else
+   }
-      anchor = NULL;
 
    if (anchor == NULL) {
       /** \todo Copy comment from old docs. */

dw/layout.hh

@@ -5,6 +5,10 @@
 #   error Do not include this file directly, use "core.hh" instead.
 #endif
 
+#include <memory>
+#include <string>
+#include <unordered_map>
+
 namespace dw {
 namespace core {
 
@@ -181,8 +185,9 @@ private:
    bool scrollIdleNotInterrupted;
 
    /* Anchors of the widget tree */
-   lout::container::typed::HashTable <lout::object::String, Anchor>
+   //lout::container::typed::HashTable <lout::object::String, Anchor>
-                                     *anchorsTable;
+                                     //*anchorsTable;
+   std::unordered_map< std::string, std::unique_ptr< Anchor > > anchorsTable;
 
    SelectionState selectionState;
    FindtextState findtextState;