try with const ref

Author: bjodah

symengine/lib/symengine.pxd

@@ -323,7 +323,7 @@ cdef extern from "<symengine/basic.h>" namespace "SymEngine":
     rcp_const_basic make_rcp_Symbol "SymEngine::make_rcp<const SymEngine::Symbol>"(string name) nogil
     rcp_const_basic make_rcp_Dummy "SymEngine::make_rcp<const SymEngine::Dummy>"() nogil
     rcp_const_basic make_rcp_Dummy "SymEngine::make_rcp<const SymEngine::Dummy>"(string name) nogil
-    rcp_const_basic make_rcp_Dummy "SymEngine::make_rcp<const SymEngine::Dummy>"(string name, size_t index) nogil
+    rcp_const_basic make_rcp_Dummy "SymEngine::make_rcp<const SymEngine::Dummy>"(string const& name, size_t index) nogil
     rcp_const_basic make_rcp_PySymbol "SymEngine::make_rcp<const SymEngine::PySymbol>"(string name, PyObject * pyobj, bool use_pickle) except +
     rcp_const_basic make_rcp_Constant "SymEngine::make_rcp<const SymEngine::Constant>"(string name) nogil
     rcp_const_basic make_rcp_Infty "SymEngine::make_rcp<const SymEngine::Infty>"(RCP[const Number] i) nogil