Resolve "Frame/Capture/Feature/Landmark Other as list/vectors in FactorBase"

Closes #294 (closed)

include/core/factor/factor_base.h

@@ -182,10 +182,10 @@ class FactorBase : public NodeBase, public std::enable_shared_from_this<FactorBa
         FeatureBaseWPtrList getFeatureOtherList() const     { return feature_other_list_; }
         LandmarkBaseWPtrList getLandmarkOtherList() const   { return landmark_other_list_; }
 
-        bool hasFrameOther(const FrameBasePtr& _frm_other);
-        bool hasCaptureOther(const CaptureBasePtr& _cap_other);
-        bool hasFeatureOther(const FeatureBasePtr& _ftr_other);
-        bool hasLandmarkOther(const LandmarkBasePtr& _lmk_other);
+        bool hasFrameOther(const FrameBasePtr& _frm_other) const;
+        bool hasCaptureOther(const CaptureBasePtr& _cap_other) const;
+        bool hasFeatureOther(const FeatureBasePtr& _ftr_other) const;
+        bool hasLandmarkOther(const LandmarkBasePtr& _lmk_other) const;
 
     public:
         /**