Prevent improper use of rvalue

autopybind11/__main__.py

@@ -1159,20 +1159,19 @@ class BindingsGenerator:
                     # check if type is abstract here? Still will need to resolve the type
                     # then clear all vars and return, or just return, return null string, cause
                     # we cant bind (as of now)
+                    arg_ret = ""
                     if self.opts.cxx14_flag:
-                        lambda_return += (
-                            self.opts.make_unique_fmt.format(
-                                type=type_, var=name
-                            )
-                            + ","
+                        arg_ret = self.opts.make_unique_fmt.format(
+                            type=type_, var=name
                         )
                     else:
-                        lambda_return += (
-                            self.opts.compose_unique.format(
-                                type=type_, var=name
-                            )
-                            + ","
+                        arg_ret = self.opts.compose_unique.format(
+                            type=type_, var=name
                         )
+                    if dec.type_traits.is_reference(arg.decl_type):
+                        lambda_body += "auto uni_ptr = {};".format(arg_ret)
+                        arg_ret = "uni_ptr"
+                    lambda_return += arg_ret + ","
                 else:
                     type_ = arg.decl_type.decl_string
                     lambda_return += name + ", "