Make EntityComponentData a const function

Signed-off-by: Addisu Z. Taddese <[email protected]>

Author: azeey

include/ignition/gazebo/detail/View.hh

@@ -77,7 +77,7 @@ class IGNITION_GAZEBO_VISIBLE View : public BaseView
   /// \param[_in] _entity The entity
   /// \return The entity and its component data. Mutable pointers to the
   /// component data are returned.
-  public: const ComponentData &EntityComponentData(const Entity _entity);
+  public: const ComponentData &EntityComponentData(const Entity _entity) const;
 
   /// \brief Add an entity with its component data to the view. It is assumed
   /// that the entity to be added does not already exist in the view.

src/View.cc

@@ -40,12 +40,11 @@ const std::vector<const components::BaseComponent *>
 
 //////////////////////////////////////////////////
 const std::vector<components::BaseComponent *> &View::EntityComponentData(
-    const Entity _entity)
+    const Entity _entity) const
 {
   return this->validData.at(_entity);
 }
 
-
 //////////////////////////////////////////////////
 bool View::HasCachedComponentData(const Entity _entity) const
 {