[feature-pose] Forward declaration of CLASS_NAME for feature-pose.

Author: olivier-stasse

include/sot/core/feature-pose.hh

@@ -167,6 +167,10 @@ template <typename T>
 Vector6d convertVelocity(const MatrixHomogeneous &M,
                          const MatrixHomogeneous &Mdes,
                          const Vector &faNufafbDes);
+
+template<> const std::string FeaturePose<SE3Representation>::CLASS_NAME;
+template<> const std::string FeaturePose<R3xSO3Representation>::CLASS_NAME;
+
 #if __cplusplus >= 201103L
 extern template class SOT_CORE_DLLAPI FeaturePose<SE3Representation>;
 extern template class SOT_CORE_DLLAPI FeaturePose<R3xSO3Representation>;