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Diffstat (limited to 'boost/outcome/experimental/result.h')
-rw-r--r-- | boost/outcome/experimental/result.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/boost/outcome/experimental/result.h b/boost/outcome/experimental/result.h new file mode 100644 index 0000000000..dd06ce4b68 --- /dev/null +++ b/boost/outcome/experimental/result.h @@ -0,0 +1,82 @@ +/* C interface for result +(C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (59 commits) +File Created: Aug 2017 + + +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_EXPERIMENTAL_RESULT_H +#define BOOST_OUTCOME_EXPERIMENTAL_RESULT_H + +#include <stdint.h> // for intptr_t + +#define BOOST_OUTCOME_C_DECLARE_RESULT(ident, R, S) \ + struct cxx_result_##ident \ + { \ + R value; \ + unsigned flags; \ + S error; \ + } + +#define BOOST_OUTCOME_C_RESULT(ident) struct cxx_result_##ident + + +#define BOOST_OUTCOME_C_RESULT_HAS_VALUE(r) (((r).flags & 1U) == 1U) + +#define BOOST_OUTCOME_C_RESULT_HAS_ERROR(r) (((r).flags & 2U) == 2U) + +#define BOOST_OUTCOME_C_RESULT_ERROR_IS_ERRNO(r) (((r).flags & (1U << 4U)) == (1U << 4U)) + + +/***************************** <system_error2> support ******************************/ + +#define BOOST_OUTCOME_C_DECLARE_STATUS_CODE(ident, value_type) \ + struct cxx_status_code_##ident \ + { \ + void *domain; \ + value_type value; \ + }; + +#define BOOST_OUTCOME_C_STATUS_CODE(ident) struct cxx_status_code_##ident + + +struct cxx_status_code_posix +{ + void *domain; + int value; +}; +#define BOOST_OUTCOME_C_DECLARE_RESULT_ERRNO(ident, R) BOOST_OUTCOME_C_DECLARE_RESULT(posix_##ident, R, struct cxx_status_code_posix) +#define BOOST_OUTCOME_C_RESULT_ERRNO(ident) BOOST_OUTCOME_C_RESULT(posix_##ident) + +struct cxx_status_code_system +{ + void *domain; + intptr_t value; +}; +#define BOOST_OUTCOME_C_DECLARE_RESULT_SYSTEM(ident, R) BOOST_OUTCOME_C_DECLARE_RESULT(system_##ident, R, struct cxx_status_code_system) +#define BOOST_OUTCOME_C_RESULT_SYSTEM(ident) BOOST_OUTCOME_C_RESULT(system_##ident) + +#endif |