Add overloads for Mutable handle calls to the navigator

Attempt for checking whether this is enough to get some parts of the
LinkNavigator work more easily from the python side

Author: tmadlener

include/podio/LinkNavigator.h

@@ -95,6 +95,11 @@ class LinkNavigator {
     return result;
   }
 
+  std::vector<WeightedObject<FromT>> getLinked(const ToT::mutable_type& object,
+                                               podio::detail::links::ReturnFromTag) const {
+    return getLinked(ToT(object), podio::ReturnFrom);
+  }
+
   /// Get all the *From* objects and weights that have links with the passed
   /// object
   ///
@@ -111,6 +116,13 @@ class LinkNavigator {
     return getLinked(object, podio::ReturnFrom);
   }
 
+  /// Overload for cppyy that makes things work with mutable handles
+  template <typename ToU = ToT>
+  std::enable_if_t<!std::is_same_v<FromT, ToU>, std::vector<WeightedObject<FromT>>>
+  getLinked(const ToT::mutable_type& object) const {
+    return getLinked(ToT(object), podio::ReturnFrom);
+  }
+
   /// Get all the *To* objects and weights that have links with the passed
   /// object
   ///
@@ -137,6 +149,11 @@ class LinkNavigator {
     return result;
   }
 
+  std::vector<WeightedObject<ToT>> getLinked(const FromT::mutable_type& object,
+                                             podio::detail::links::ReturnToTag) const {
+    return getLinked(FromT(object), podio::ReturnTo);
+  }
+
   /// Get all the *To* objects and weights that have links with the passed
   /// object
   ///
@@ -153,6 +170,13 @@ class LinkNavigator {
     return getLinked(object, podio::ReturnTo);
   }
 
+  /// Overload for cppyy that makes things work with mutable handles
+  template <typename FromU = FromT>
+  std::enable_if_t<!std::is_same_v<FromU, ToT>, std::vector<WeightedObject<ToT>>>
+  getLinked(const FromT::mutable_type& object) const {
+    return getLinked(FromT(object), podio::ReturnTo);
+  }
+
 private:
   std::multimap<FromT, WeightedObject<ToT>> m_from2to{}; ///< Map the from to the to objects
   std::multimap<ToT, WeightedObject<FromT>> m_to2from{}; ///< Map the to to the from objects