5 files changed, 96 insertions, 16 deletions
diff --git a/src/engine/machina/Machine.hpp b/src/engine/machina/Machine.hpp
index 626ef10..889dc1a 100644
--- a/src/engine/machina/Machine.hpp
+++ b/src/engine/machina/Machine.hpp
@@ -61,9 +61,12 @@ public:
 	SharedPtr<LearnRequest> pending_learn() { return _pending_learn; }
 	void clear_pending_learn()              { _pending_learn.reset(); }
 
-	typedef Raul::List<SharedPtr<Node> > Nodes;
+	typedef Raul::List< SharedPtr<Node> > Nodes;
 	Nodes& nodes() { return _nodes; }
 
+	SharedPtr<Node> random_node();
+	SharedPtr<Edge> random_edge();
+
 	void set_sink(SharedPtr<Raul::MIDISink> sink);
 	
 private:
diff --git a/src/engine/machina/MachineMutation.hpp b/src/engine/machina/MachineMutation.hpp
new file mode 100644
index 0000000..34eda30
--- /dev/null
+++ b/src/engine/machina/MachineMutation.hpp
@@ -0,0 +1,37 @@
+/* This file is part of Machina.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Machina is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Machina is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef MACHINA_MACHINE_MUTATION_HPP
+#define MACHINA_MACHINE_MUTATION_HPP
+
+namespace Machina {
+
+class Machine;
+
+namespace Mutation {
+
+struct Mutation { virtual void mutate(Machine& machine) = 0; };
+
+struct AddEdge    { static void mutate(Machine& machine); };
+struct RemoveEdge { static void mutate(Machine& machine); };
+struct AdjustEdge { static void mutate(Machine& machine); };
+
+} // namespace Mutation
+
+} // namespace Machina
+
+#endif // MACHINA_MACHINE_MUTATION_HPP
diff --git a/src/engine/machina/Makefile.am b/src/engine/machina/Makefile.am
index 65ea295..de99845 100644
--- a/src/engine/machina/Makefile.am
+++ b/src/engine/machina/Makefile.am
@@ -11,6 +11,7 @@ libmachinainclude_HEADERS = \
 	Loader.hpp \
 	Machine.hpp \
 	MachineBuilder.hpp \
+	MachineMutation.hpp \
 	MidiAction.hpp \
 	Node.hpp \
 	Recorder.hpp \
diff --git a/src/engine/machina/Node.hpp b/src/engine/machina/Node.hpp
index 041f443..a916eb6 100644
--- a/src/engine/machina/Node.hpp
+++ b/src/engine/machina/Node.hpp
@@ -24,6 +24,7 @@
 #include <raul/Stateful.hpp>
 #include <raul/MIDISink.hpp>
 #include "Action.hpp"
+#include "Schrodinbit.hpp"
 
 namespace Machina {
 
@@ -57,7 +58,7 @@ public:
 
 	void add_outgoing_edge(SharedPtr<Edge> edge);
 	void remove_outgoing_edge(SharedPtr<Edge> edge);
-	void remove_outgoing_edges_to(SharedPtr<Node> node);
+	void remove_edges_to(SharedPtr<Node> node);
 
 	void write_state(Redland::Model& model);
 
@@ -71,23 +72,16 @@ public:
 	bool      is_selector() const       { return _is_selector; }
 	void      set_selector(bool i);
 
-	/// Schroedinger's flag
-	inline bool changed() {
-		if (_changed) {
-			_changed = false;
-			return true;
-		} else {
-			return false;
-		}
-	}
-
-	void set_changed() { _changed = true; }
+	inline bool changed()     { return _changed; }
+	inline void set_changed() { _changed = true; }
 	
 	typedef Raul::List<SharedPtr<Edge> > Edges;
-	Edges& outgoing_edges() { return _outgoing_edges; }
+	Edges& edges() { return _edges; }
+	
+	SharedPtr<Edge> random_edge();
 	
 private:
-	bool              _changed;
+	Schrodinbit       _changed;
 	bool              _is_initial;
 	bool              _is_selector;
 	bool              _is_active;
@@ -95,7 +89,7 @@ private:
 	BeatCount         _duration;
 	SharedPtr<Action> _enter_action;
 	SharedPtr<Action> _exit_action;
-	Edges             _outgoing_edges;
+	Edges             _edges;
 };
 
 
diff --git a/src/engine/machina/Schrodinbit.hpp b/src/engine/machina/Schrodinbit.hpp
new file mode 100644
index 0000000..6065cfc
--- /dev/null
+++ b/src/engine/machina/Schrodinbit.hpp
@@ -0,0 +1,45 @@
+/* This file is part of Machina.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Machina is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Machina is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef SCHRODINBIT_HPP
+#define SCHRODINBIT_HPP
+
+
+/** A flag which becomes false when it's value is observed
+ */
+class Schrodinbit {
+public:
+	Schrodinbit() : _flag(false) {}
+
+	inline operator bool() {
+		const bool ret = _flag;
+		_flag = false;
+		return ret;
+	}
+
+	inline bool operator=(bool flag) {
+		_flag = flag;
+		return flag;
+	}
+
+private:
+	bool _flag;
+};
+
+
+#endif // SCHRODINBIT_HPP
+