robot/include/boost/outcome/experimental/status-code/system_code.hpp

/* Proposed SG14 status_code
(C) 2018-2024 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
File Created: Feb 2018


Boost Software License - Version 1.0 - August 17th, 2003

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*/

#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_SYSTEM_CODE_HPP
#define BOOST_OUTCOME_SYSTEM_ERROR2_SYSTEM_CODE_HPP

#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX
#include "posix_code.hpp"
#else
#include "quick_status_code_from_enum.hpp"
#endif

#if defined(_WIN32) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
#include "nt_code.hpp"
#include "win32_code.hpp"
// NOT "com_code.hpp"
#endif

BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
/*! An erased-mutable status code suitably large for all the system codes
which can be returned on this system.

For Windows, these might be:

    - `com_code` (`HRESULT`)  [you need to include "com_code.hpp" explicitly for this]
    - `nt_code` (`LONG`)
    - `win32_code` (`DWORD`)

For POSIX, `posix_code` is possible.

You are guaranteed that `system_code` can be transported by the compiler
in exactly two CPU registers.
*/
using system_code = erased_status_code<intptr_t>;

#ifndef NDEBUG
static_assert(sizeof(system_code) == 2 * sizeof(void *), "system_code is not exactly two pointers in size!");
static_assert(traits::is_move_bitcopying<system_code>::value, "system_code is not move bitcopying!");
#endif

BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END

#endif