105 lines
6.0 KiB
C
105 lines
6.0 KiB
C
/* C interface for result
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(C) 2017-2022 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
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File Created: Aug 2017
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BOOST_OUTCOME_EXPERIMENTAL_RESULT_H
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#define BOOST_OUTCOME_EXPERIMENTAL_RESULT_H
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#include <stdint.h> // for intptr_t
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define BOOST_OUTCOME_C_DECLARE_RESULT(ident, R, S) \
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struct cxx_result_##ident \
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{ \
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union \
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{ \
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R value; \
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S error; \
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}; \
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unsigned flags; \
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}
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#define BOOST_OUTCOME_C_RESULT(ident) struct cxx_result_##ident
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#define BOOST_OUTCOME_C_RESULT_HAS_VALUE(r) (((r).flags & 1U) == 1U)
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#define BOOST_OUTCOME_C_RESULT_HAS_ERROR(r) (((r).flags & 2U) == 2U)
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#define BOOST_OUTCOME_C_RESULT_ERROR_IS_ERRNO(r) (((r).flags & (1U << 4U)) == (1U << 4U))
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/***************************** <system_error2> support ******************************/
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#define BOOST_OUTCOME_C_DECLARE_STATUS_CODE(ident, value_type) \
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struct cxx_status_code_##ident \
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{ \
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void *domain; \
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value_type value; \
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};
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#define BOOST_OUTCOME_C_STATUS_CODE(ident) struct cxx_status_code_##ident
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#define BOOST_OUTCOME_C_DECLARE_RESULT_STATUS_CODE(ident, R, S) \
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struct cxx_result_status_code_##ident \
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{ \
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R value; \
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unsigned flags; \
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S error; \
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}
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#define BOOST_OUTCOME_C_RESULT_STATUS_CODE(ident) struct cxx_result_status_code_##ident
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struct cxx_status_code_posix
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{
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void *domain;
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int value;
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};
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#define BOOST_OUTCOME_C_DECLARE_RESULT_ERRNO(ident, R) BOOST_OUTCOME_C_DECLARE_RESULT_STATUS_CODE(posix_##ident, R, struct cxx_status_code_posix)
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#define BOOST_OUTCOME_C_RESULT_ERRNO(ident) BOOST_OUTCOME_C_RESULT_STATUS_CODE(posix_##ident)
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struct cxx_status_code_system
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{
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void *domain;
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intptr_t value;
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};
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#define BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM(ident, R) BOOST_OUTCOME_C_DECLARE_RESULT_STATUS_CODE(system_##ident, R, struct cxx_status_code_system)
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#define BOOST_OUTCOME_C_RESULT_SYSTEM(ident) BOOST_OUTCOME_C_RESULT_STATUS_CODE(system_##ident)
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#ifdef __cplusplus
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}
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#endif
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#endif
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