feature functions support e.g. --usage=LanguageModel, report feature ids, warn about duplicate ids, 0-expand weight vector for no segfault, --warn_0_weight, and know their own names to simplify registration

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@192 ec762483-ff6d-05da-a07a-a48fb63a330f

1 files changed, 4 insertions, 0 deletions

diff --git a/decoder/ff_lm.cc b/decoder/ff_lm.cc
index 9e6f02b7..0590fa7e 100644
--- a/decoder/ff_lm.cc
+++ b/decoder/ff_lm.cc
@@ -532,6 +532,10 @@ LanguageModel::LanguageModel(const string& param) {
   SetStateSize(LanguageModelImpl::OrderToStateSize(order));
 }
 
+FeatureFunction::Features LanguageModel::features() const {
+  return single_feature(fid_);
+}
+
 LanguageModel::~LanguageModel() {
   delete pimpl_;
 }