function process(Out &&, In &&, shape<0>, shape<0>, csize_t<gw>) expressions¶

template <size_t width = 0, index_t Axis = 0, typename Out, typename In, size_t gw = 1>
    requires(expression_traits<Out>::dims == 0)
static auto process(Out&& out, In&& in, shape<0> = { … }