ceph/src/boost/boost/outcome/std_result.hpp

   1 /* A very simple result type
   2 (C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (8 commits)
   3 File Created: June 2017
   4
   5
   6 Boost Software License - Version 1.0 - August 17th, 2003
   7
   8 Permission is hereby granted, free of charge, to any person or organization
   9 obtaining a copy of the software and accompanying documentation covered by
  10 this license (the "Software") to use, reproduce, display, distribute,
  11 execute, and transmit the Software, and to prepare derivative works of the
  12 Software, and to permit third-parties to whom the Software is furnished to
  13 do so, all subject to the following:
  14
  15 The copyright notices in the Software and this entire statement, including
  16 the above license grant, this restriction and the following disclaimer,
  17 must be included in all copies of the Software, in whole or in part, and
  18 all derivative works of the Software, unless such copies or derivative
  19 works are solely in the form of machine-executable object code generated by
  20 a source language processor.
  21
  22 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  25 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  26 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  27 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  28 DEALINGS IN THE SOFTWARE.
  29 */
  30
  31 #ifndef BOOST_OUTCOME_STD_RESULT_HPP
  32 #define BOOST_OUTCOME_STD_RESULT_HPP
  33
  34 #include "basic_result.hpp"
  35 #include "detail/trait_std_error_code.hpp"
  36 #include "detail/trait_std_exception.hpp"
  37
  38 #include "policy/fail_to_compile_observers.hpp"
  39 #include "policy/result_error_code_throw_as_system_error.hpp"
  40 #include "policy/result_exception_ptr_rethrow.hpp"
  41 #include "policy/throw_bad_result_access.hpp"
  42
  43 BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
  44
  45 /*! AWAITING HUGO JSON CONVERSION TOOL
  46 SIGNATURE NOT RECOGNISED
  47 */
  48 namespace policy
  49 {
  50   /*! AWAITING HUGO JSON CONVERSION TOOL
  51 SIGNATURE NOT RECOGNISED
  52 */
  53   template <class T, class EC, class E>
  54   using default_policy = std::conditional_t<  //
  55   std::is_void<EC>::value && std::is_void<E>::value,
  56   terminate,                                                                                                                     //
  57   std::conditional_t<                                                                                                            //
  58   trait::is_error_code_available<EC>::value, error_code_throw_as_system_error<T, EC, E>,                                         //
  59   std::conditional_t<                                                                                                            //
  60   trait::is_exception_ptr_available<EC>::value || trait::is_exception_ptr_available<E>::value, exception_ptr_rethrow<T, EC, E>,  //
  61   fail_to_compile_observers                                                                                                      //
  62   >>>;
  63 }  // namespace policy
  64
  65 /*! AWAITING HUGO JSON CONVERSION TOOL
  66 SIGNATURE NOT RECOGNISED
  67 */
  68 template <class R, class S = std::error_code, class NoValuePolicy = policy::default_policy<R, S, void>>  //
  69 using std_result = basic_result<R, S, NoValuePolicy>;
  70
  71 /*! AWAITING HUGO JSON CONVERSION TOOL
  72 type alias template <class R, class S = std::error_code> std_unchecked. Potential doc page: `std_unchecked<T, E = std::error_code>`
  73 */
  74 template <class R, class S = std::error_code> using std_unchecked = std_result<R, S, policy::all_narrow>;
  75
  76 /*! AWAITING HUGO JSON CONVERSION TOOL
  77 type alias template <class R, class S = std::error_code> std_checked. Potential doc page: `std_checked<T, E = std::error_code>`
  78 */
  79 template <class R, class S = std::error_code> using std_checked = std_result<R, S, policy::throw_bad_result_access<S, void>>;
  80
  81 BOOST_OUTCOME_V2_NAMESPACE_END
  82
  83 #endif