xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
CMakeLists.txt	4d99525703 first commit	6 月之前
exception_policy.hpp	4d99525703 first commit	6 月之前
integer.hpp	4d99525703 first commit	6 月之前
numeric.hpp	4d99525703 first commit	6 月之前
promotion_policy.hpp	4d99525703 first commit	6 月之前
safe_numeric.hpp	4d99525703 first commit	6 月之前