1 files changed, 29 insertions, 0 deletions
diff --git a/decoder/ff_fsa_dynamic.h b/decoder/ff_fsa_dynamic.h
new file mode 100755
index 00000000..79672bdc
--- /dev/null
+++ b/decoder/ff_fsa_dynamic.h
@@ -0,0 +1,29 @@
+#ifndef FF_FSA_DYNAMIC_H
+#define FF_FSA_DYNAMIC_H
+
+#include "ff_fsa.h"
+
+// the type-erased interface
+/*
+struct FsaFeatureFunction {
+  virtual int markov_order() const = 0;
+  virtual ~FsaFeatureFunction();
+
+};
+
+// conforming to above interface, type erases FsaImpl
+// you might be wondering: why do this?  answer: it's cool, and it means that the bottom-up ff over ff_fsa wrapper doesn't go through multiple layers of dynamic dispatch
+template <class Impl>
+struct FsaFeatureFunctionDynamic : public FsaFeatureFunction {
+  Impl& d() { return static_cast<Impl&>(*this); }
+  Impl const& d() { return static_cast<Impl const&>(*this); }
+  int markov_order() const { return d().markov_order(); }
+};
+
+//TODO: wrap every method in concrete fsaff and declare in interface above.
+//TODO: combine 2 (or N) FsaFeatureFunction (type erased)
+
+*/
+
+
+#endif