xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
at_impl.hpp	4d99525703 first commit	6 月之前
begin_impl.hpp	4d99525703 first commit	6 月之前
category_of_impl.hpp	4d99525703 first commit	6 月之前
end_impl.hpp	4d99525703 first commit	6 月之前
is_sequence_impl.hpp	4d99525703 first commit	6 月之前
is_view_impl.hpp	4d99525703 first commit	6 月之前
size_impl.hpp	4d99525703 first commit	6 月之前
value_at_impl.hpp	4d99525703 first commit	6 月之前