1 files changed, 47 insertions, 0 deletions
diff --git a/extractor/features/feature.h b/extractor/features/feature.h
new file mode 100644
index 00000000..36ea504a
--- /dev/null
+++ b/extractor/features/feature.h
@@ -0,0 +1,47 @@
+#ifndef _FEATURE_H_
+#define _FEATURE_H_
+
+#include <string>
+
+#include "phrase.h"
+
+using namespace std;
+
+namespace extractor {
+namespace features {
+
+/**
+ * Structure providing context for computing feature scores.
+ */
+struct FeatureContext {
+  FeatureContext(const Phrase& source_phrase, const Phrase& target_phrase,
+                 double source_phrase_count, int pair_count, int num_samples) :
+    source_phrase(source_phrase), target_phrase(target_phrase),
+    source_phrase_count(source_phrase_count), pair_count(pair_count),
+    num_samples(num_samples) {}
+
+  Phrase source_phrase;
+  Phrase target_phrase;
+  double source_phrase_count;
+  int pair_count;
+  int num_samples;
+};
+
+/**
+ * Base class for features.
+ */
+class Feature {
+ public:
+  virtual double Score(const FeatureContext& context) const = 0;
+
+  virtual string GetName() const = 0;
+
+  virtual ~Feature();
+
+  static const double MAX_SCORE;
+};
+
+} // namespace features
+} // namespace extractor
+
+#endif