66 lines
2.6 KiB
C++
66 lines
2.6 KiB
C++
/* Proposed SG14 status_code
|
|
(C) 2018-2022 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
|
|
File Created: Feb 2018
|
|
|
|
|
|
Boost Software License - Version 1.0 - August 17th, 2003
|
|
|
|
Permission is hereby granted, free of charge, to any person or organization
|
|
obtaining a copy of the software and accompanying documentation covered by
|
|
this license (the "Software") to use, reproduce, display, distribute,
|
|
execute, and transmit the Software, and to prepare derivative works of the
|
|
Software, and to permit third-parties to whom the Software is furnished to
|
|
do so, all subject to the following:
|
|
|
|
The copyright notices in the Software and this entire statement, including
|
|
the above license grant, this restriction and the following disclaimer,
|
|
must be included in all copies of the Software, in whole or in part, and
|
|
all derivative works of the Software, unless such copies or derivative
|
|
works are solely in the form of machine-executable object code generated by
|
|
a source language processor.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
|
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
|
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
|
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_ERROR_HPP
|
|
#define BOOST_OUTCOME_SYSTEM_ERROR2_ERROR_HPP
|
|
|
|
#include "errored_status_code.hpp"
|
|
#include "system_code.hpp"
|
|
|
|
BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
|
|
|
|
/*! An erased `system_code` which is always a failure. The closest equivalent to
|
|
`std::error_code`, except it cannot be null and cannot be modified.
|
|
|
|
This refines `system_code` into an `error` object meeting the requirements of
|
|
[P0709 Zero-overhead deterministic exceptions](https://wg21.link/P0709).
|
|
|
|
Differences from `system_code`:
|
|
|
|
- Always a failure (this is checked at construction, and if not the case,
|
|
the program is terminated as this is a logic error)
|
|
- No default construction.
|
|
- No empty state possible.
|
|
- Is immutable.
|
|
|
|
As with `system_code`, it remains guaranteed to be two CPU registers in size,
|
|
and move bitcopying.
|
|
*/
|
|
using error = errored_status_code<erased<system_code::value_type>>;
|
|
|
|
#ifndef NDEBUG
|
|
static_assert(sizeof(error) == 2 * sizeof(void *), "error is not exactly two pointers in size!");
|
|
static_assert(traits::is_move_bitcopying<error>::value, "error is not move bitcopying!");
|
|
#endif
|
|
|
|
BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
|
|
|
|
#endif
|