ceph/src/boost/boost/outcome/detail/basic_outcome_exception_observers.hpp

   1 /* Exception observers for outcome type
   2 (C) 2017-2019 Niall Douglas <http://www.nedproductions.biz/> (3 commits)
   3 File Created: Oct 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_BASIC_OUTCOME_EXCEPTION_OBSERVERS_HPP
  32 #define BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_HPP
  33
  34 #include "basic_result_storage.hpp"
  35
  36 BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
  37
  38 namespace detail
  39 {
  40   template <class Base, class R, class S, class P, class NoValuePolicy> class basic_outcome_exception_observers : public Base
  41   {
  42   public:
  43     using exception_type = P;
  44     using Base::Base;
  45
  46     constexpr inline exception_type &assume_exception() & noexcept;
  47     constexpr inline const exception_type &assume_exception() const &noexcept;
  48     constexpr inline exception_type &&assume_exception() && noexcept;
  49     constexpr inline const exception_type &&assume_exception() const &&noexcept;
  50
  51     constexpr inline exception_type &exception() &;
  52     constexpr inline const exception_type &exception() const &;
  53     constexpr inline exception_type &&exception() &&;
  54     constexpr inline const exception_type &&exception() const &&;
  55   };
  56
  57   // Exception observers not present
  58   template <class Base, class R, class S, class NoValuePolicy> class basic_outcome_exception_observers<Base, R, S, void, NoValuePolicy> : public Base
  59   {
  60   public:
  61     using Base::Base;
  62     constexpr void assume_exception() const noexcept { NoValuePolicy::narrow_exception_check(this); }
  63     constexpr void exception() const { NoValuePolicy::wide_exception_check(this); }
  64   };
  65
  66 }  // namespace detail
  67
  68 BOOST_OUTCOME_V2_NAMESPACE_END
  69
  70 #endif