CoolVLViewer/include/boost/outcome/experimental/result.h

/* C interface for result
(C) 2017-2024 Niall Douglas <http://www.nedproductions.biz/> (6 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
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must be included in all copies of the Software, in whole or in part, and
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*/

#ifndef BOOST_OUTCOME_EXPERIMENTAL_RESULT_H
#define BOOST_OUTCOME_EXPERIMENTAL_RESULT_H

#include <stdint.h>  // for intptr_t

#ifdef __cplusplus
extern "C"
{
#endif

#define BOOST_OUTCOME_C_DECLARE_RESULT(ident, R, S)                                                                                                                        \
  struct cxx_result_##ident                                                                                                                                    \
  {                                                                                                                                                            \
    union                                                                                                                                                      \
    {                                                                                                                                                          \
      R value;                                                                                                                                                 \
      S error;                                                                                                                                                 \
    };                                                                                                                                                         \
    unsigned flags;                                                                                                                                            \
  }

#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

#define BOOST_OUTCOME_C_DECLARE_RESULT_STATUS_CODE(ident, R, S)                                                                                                            \
  struct cxx_result_status_code_##ident                                                                                                                        \
  {                                                                                                                                                            \
    R value;                                                                                                                                                   \
    unsigned flags;                                                                                                                                            \
    S error;                                                                                                                                                   \
  }

#define BOOST_OUTCOME_C_RESULT_STATUS_CODE(ident) struct cxx_result_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_STATUS_CODE(posix_##ident, R, struct cxx_status_code_posix)
#define BOOST_OUTCOME_C_RESULT_ERRNO(ident) BOOST_OUTCOME_C_RESULT_STATUS_CODE(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_STATUS_CODE(system_##ident, R, struct cxx_status_code_system)
#define BOOST_OUTCOME_C_RESULT_SYSTEM(ident) BOOST_OUTCOME_C_RESULT_STATUS_CODE(system_##ident)

#ifdef __cplusplus
}
#endif

#endif