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Coding for undo/redo starts in earnest. Paul and I decided to go with a standard gang of four Command pattern, with serialization. This overcomes the terrible difficulties we were having with static type checking and the sigc++ approach. I'm adding the requirement that each command support undo, simplifying undo/redo. NOTE that an important fallout here is that Command::operator()() is the opposite of the old UndoAction::operator()(), i.e. Command::operator()() is execute/redo, and Command::undo() is undo. This commit is a reworking of the infrastructure, and won't compile until creating Command subclasses for the various commands being performed. That is primarily where you find get_memento and/or calls to add_(undo|redo.*). git-svn-id: svn://localhost/ardour2/branches/undo@655 d708f5d6-7413-0410-9779-e7cbd77b26cf
Please see the DOCUMENTATION directory. If you plan to compile ardour from scratch, BUILD is required reading.