[pygccxml-development] odd looking c++ construct in __array_1.pypp.hpp

[Gordon W. <gor...@gm...>]

in this statement

            bpl::class_< wrapper_t >( name, bpl::no_init )
                .def( "__getitem__"
                      , &wrapper_t::item_ref
                      , ( bpl::arg("index") )
                      , CallPolicies() )
                .def( "__setitem__"
                      , &wrapper_t::set_item
                      , ( bpl::arg("index"), bpl::arg("value") )
                      , CallPolicies()  )
                .def( "__len__", &wrapper_t::len );

what does this line

                      , ( bpl::arg("index"), bpl::arg("value") )

do? doesn't the use of the comma operator cause the result of the index part
to be discarded?