Object Ownership

Inkscape currently uses garbage collecting to manage the lifetime of many objects. This is problematic...

Objects managed by GC: (grep -Ir GC:: src | grep public):

• SPDocument: src/document.h
• SPDesktop (via View): ui/view/view.h
• Undo stack: undo-stack-observer.h
• XML nodes: xml/event.h, xml/attribute-record.h, xml/composite-node-observer.h, xml/node.h, xml/simple-node-observer.h, xml/simple-node.h
• Profile manager: profile-manager.h
• Layer manager: layer-manager.h
• Selections: selection.h
• Document subset: document-subset.h

Document

Documents opened for editing should be owned by InkscapeApplication.

• Help (tutorials)

Temporary documents should be opened with unique_ptr<>.

• SVG Cursors (ui/cursor-utils.cpp, uses ink_file_open(), unique_ptr)
• SVG to Pixbuf (ui/svg-renderer.cpp, uses ink_file_open(), unique_ptr)
• SPDocument::copy (document.cpp, uses createDoc() ***)
• Paint selector (ui/widget/paint-selector.cpp, uses SPDocument::createNewDoc, static, never deleted)
• Markers (ui/widget/marker-combo-box.cpp, uses SPDocument::createNewDoc, static, never deleted)
• Symbols (ui/dialog/symbols.cpp, uses SPDocument::createNewDoc() x3, not clear if any deleted)
• Win32 File (ui/dialog/filedialogimpl-win32.cpp, uses SPDocument::createNewDoc(), unique_ptr)
• About (ui/dialog/about.cpp, uses SPDocument::createNewDoc(), document not deleted!)
• Paint servers (ui/dialog/paint-servers.cpp, uses SPDocument::createNewDoc(), not deleted!)
• SVG Preview (ui/dialog/svg-preview.cpp, uses SPDocument::createNewDoc(), deleted in destructor)
• Clipboard (ui/clipboard.cpp, uses SPDocument::createNewDoc(), uses std::unique_ptr)
• InkView (inkview-window.h, uses SPDocument::createNewDoc(), not deleted!)
• ink_file_new(), ink_file_open() (io/file.cpp, uses SPDocument::createNewDoc(), not deleted, utility for other functions)
• CDR (extension/internal/cdr-input.cpp, uses SPDocument::createNewDocFromMem() x3, not deleted!)
• SVG (extension/internal/svg.cpp, uses SPDocument::createNew() x3, SPDocument::createNewDocFromMem(), not deleted!)
• PDF Input ...
• PixBuf
• WMF
• WPG
• Gimp Grad
• EMF
• VSD
• DBUS
• Cairo utils (display/cairo-utils.cpp, uses SPDocument::createNewDocFromMem(), uses std::unique_ptr)
• Stock items (helper/stock-items.cpp, uses SPDocument::createNewDoc(), markers, static, not deleted).
• URIReference (object/uri-reference.cpp, uses SPDocument::createChildDoc(),

One problem, when saving, a document is copied so it can be modified in place. This document stores a reference to the original document.