From 1aac806af7785ab440d300ca5cfa8833e3ed61d3 Mon Sep 17 00:00:00 2001
From: Chris Dyer <redpony@gmail.com>
Date: Fri, 18 Dec 2009 01:27:19 -0500
Subject: add support for freezing the feature set to a user-specified list,
 even if feature detectors create additional features

---
 decoder/fdict.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'decoder/fdict.h')

diff --git a/decoder/fdict.h b/decoder/fdict.h
index ff491cfb..d05f1706 100644
--- a/decoder/fdict.h
+++ b/decoder/fdict.h
@@ -6,16 +6,23 @@
 #include "dict.h"
 
 struct FD {
-  static Dict dict_;
+  // once the FD is frozen, new features not already in the
+  // dictionary will return 0
+  static void Freeze() {
+    frozen_ = true;
+  }
   static inline int NumFeats() {
     return dict_.max() + 1;
   }
   static inline WordID Convert(const std::string& s) {
-    return dict_.Convert(s);
+    return dict_.Convert(s, frozen_);
   }
   static inline const std::string& Convert(const WordID& w) {
     return dict_.Convert(w);
   }
+  static Dict dict_;
+ private:
+  static bool frozen_;
 };
 
 #endif
-- 
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