std: fix issue regarding potential leak for the tolist() method

Author: jcarpent

include/eigenpy/std-array.hpp

@@ -1,4 +1,6 @@
-/// Copyright (c) 2023 CNRS INRIA
+///
+/// Copyright (c) 2023-2024 CNRS INRIA
+///
 
 #ifndef __eigenpy_utils_std_array_hpp__
 #define __eigenpy_utils_std_array_hpp__
@@ -138,7 +140,8 @@ struct StdArrayPythonVisitor {
       cl.def(indexing_suite)
           .def(visitor)
           .def("tolist", tolist, bp::arg("self"),
-               "Returns the std::array as a Python list.");
+               "Returns the std::array as a Python list.",
+               bp::return_internal_reference<>());
     }
   }
 };

include/eigenpy/std-vector.hpp

@@ -1,4 +1,5 @@
-/// Copyright (c) 2016-2022 CNRS INRIA
+///
+/// Copyright (c) 2016-2024 CNRS INRIA
 /// This file was taken from Pinocchio (header
 /// <pinocchio/bindings/python/utils/std-vector.hpp>)
 ///
@@ -386,7 +387,8 @@ struct ExposeStdMethodToStdVector
   void visit(Class &cl) const {
     cl.def(m_co_visitor)
         .def("tolist", &FromPythonListConverter::tolist, bp::arg("self"),
-             "Returns the std::vector as a Python list.")
+             "Returns the std::vector as a Python list.",
+             bp::return_internal_reference<>())
         .def("reserve", &Container::reserve,
              (bp::arg("self"), bp::arg("new_cap")),
              "Increase the capacity of the vector to a value that's greater "