### system_category

Returns the error category used for the system errors produced by asio.

    const error_category & system_category();

##### Requirements

Header: `asio/error_code.hpp`

Convenience header: `asio.hpp`

| Copyright © 2003-2018 Christopher M. Kohlhoff Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)