keys now returns const references

2009-09-03 17:24:46 +00:00 · 2009-09-03 17:24:46 +00:00 · 012437c573
parent 2357e8aefc
commit 012437c573
1 changed files with 1 additions and 1 deletions
--- a/cpp/NonlinearFactor.h
+++ b/cpp/NonlinearFactor.h
@ -65,7 +65,7 @@ namespace gtsam {
    /** get functions */
    double get_sigma() const {return sigma_;}
    Vector get_measurement() const {return z_;}
-    std::list<std::string> get_keys() const {return keys_;}
+    const std::list<std::string>& get_keys() const {return keys_;}
    void set_keys(std::list<std::string> keys) {keys_ = keys;}

    /** calculate the error of the factor */