ceph/src/boost/boost/outcome/experimental/status-code/getaddrinfo_code.hpp

   1 /* Proposed SG14 status_code
   2 (C) 2020 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
   3 File Created: Jan 2020
   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_SYSTEM_ERROR2_GETADDRINFO_CODE_HPP
  32 #define BOOST_OUTCOME_SYSTEM_ERROR2_GETADDRINFO_CODE_HPP
  33
  34 #include "generic_code.hpp"
  35
  36 #ifdef _WIN32
  37 #error Not available for Microsoft Windows
  38 #else
  39 #include <netdb.h>
  40 #include <sys/socket.h>
  41 #include <sys/types.h>
  42 #endif
  43
  44 BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
  45
  46 class _getaddrinfo_code_domain;
  47 //! A getaddrinfo error code, those returned by `getaddrinfo()`.
  48 using getaddrinfo_code = status_code<_getaddrinfo_code_domain>;
  49 //! A specialisation of `status_error` for the `getaddrinfo()` error code domain.
  50 using getaddrinfo_error = status_error<_getaddrinfo_code_domain>;
  51
  52 /*! The implementation of the domain for `getaddrinfo()` error codes, those returned by `getaddrinfo()`.
  53  */
  54 class _getaddrinfo_code_domain : public status_code_domain
  55 {
  56   template <class DomainType> friend class status_code;
  57   template <class StatusCode> friend class detail::indirecting_domain;
  58   using _base = status_code_domain;
  59
  60 public:
  61   //! The value type of the `getaddrinfo()` code, which is an `int`
  62   using value_type = int;
  63   using _base::string_ref;
  64
  65   //! Default constructor
  66   constexpr explicit _getaddrinfo_code_domain(typename _base::unique_id_type id = 0x5b24b2de470ff7b6) noexcept
  67       : _base(id)
  68   {
  69   }
  70   _getaddrinfo_code_domain(const _getaddrinfo_code_domain &) = default;
  71   _getaddrinfo_code_domain(_getaddrinfo_code_domain &&) = default;
  72   _getaddrinfo_code_domain &operator=(const _getaddrinfo_code_domain &) = default;
  73   _getaddrinfo_code_domain &operator=(_getaddrinfo_code_domain &&) = default;
  74   ~_getaddrinfo_code_domain() = default;
  75
  76   //! Constexpr singleton getter. Returns constexpr getaddrinfo_code_domain variable.
  77   static inline constexpr const _getaddrinfo_code_domain &get();
  78
  79   virtual string_ref name() const noexcept override { return string_ref("getaddrinfo() domain"); }  // NOLINT
  80 protected:
  81   virtual bool _do_failure(const status_code<void> &code) const noexcept override  // NOLINT
  82   {
  83     assert(code.domain() == *this);                                   // NOLINT
  84     return static_cast<const getaddrinfo_code &>(code).value() != 0;  // NOLINT
  85   }
  86   virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override  // NOLINT
  87   {
  88     assert(code1.domain() == *this);                                // NOLINT
  89     const auto &c1 = static_cast<const getaddrinfo_code &>(code1);  // NOLINT
  90     if(code2.domain() == *this)
  91     {
  92       const auto &c2 = static_cast<const getaddrinfo_code &>(code2);  // NOLINT
  93       return c1.value() == c2.value();
  94     }
  95     return false;
  96   }
  97   virtual generic_code _generic_code(const status_code<void> &code) const noexcept override  // NOLINT
  98   {
  99     assert(code.domain() == *this);                               // NOLINT
 100     const auto &c = static_cast<const getaddrinfo_code &>(code);  // NOLINT
 101     switch(c.value())
 102     {
 103 #ifdef EAI_ADDRFAMILY
 104     case EAI_ADDRFAMILY:
 105       return errc::no_such_device_or_address;
 106 #endif
 107     case EAI_FAIL:
 108       return errc::io_error;
 109     case EAI_MEMORY:
 110       return errc::not_enough_memory;
 111 #ifdef EAI_NODATA
 112     case EAI_NODATA:
 113       return errc::no_such_device_or_address;
 114 #endif
 115     case EAI_NONAME:
 116       return errc::no_such_device_or_address;
 117 #ifdef EAI_OVERFLOW
 118     case EAI_OVERFLOW:
 119       return errc::argument_list_too_long;
 120 #endif
 121     case EAI_BADFLAGS:  // fallthrough
 122     case EAI_SERVICE:
 123       return errc::invalid_argument;
 124     case EAI_FAMILY:  // fallthrough
 125     case EAI_SOCKTYPE:
 126       return errc::operation_not_supported;
 127     case EAI_AGAIN:  // fallthrough
 128     case EAI_SYSTEM:
 129       return errc::resource_unavailable_try_again;
 130     default:
 131       return errc::unknown;
 132     }
 133   }
 134   virtual string_ref _do_message(const status_code<void> &code) const noexcept override  // NOLINT
 135   {
 136     assert(code.domain() == *this);                               // NOLINT
 137     const auto &c = static_cast<const getaddrinfo_code &>(code);  // NOLINT
 138     return string_ref(gai_strerror(c.value()));
 139   }
 140 #if defined(_CPPUNWIND) || defined(__EXCEPTIONS) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
 141   BOOST_OUTCOME_SYSTEM_ERROR2_NORETURN virtual void _do_throw_exception(const status_code<void> &code) const override  // NOLINT
 142   {
 143     assert(code.domain() == *this);                               // NOLINT
 144     const auto &c = static_cast<const getaddrinfo_code &>(code);  // NOLINT
 145     throw status_error<_getaddrinfo_code_domain>(c);
 146   }
 147 #endif
 148 };
 149 //! A constexpr source variable for the `getaddrinfo()` code domain, which is that of `getaddrinfo()`. Returned by `_getaddrinfo_code_domain::get()`.
 150 constexpr _getaddrinfo_code_domain getaddrinfo_code_domain;
 151 inline constexpr const _getaddrinfo_code_domain &_getaddrinfo_code_domain::get()
 152 {
 153   return getaddrinfo_code_domain;
 154 }
 155
 156 BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
 157
 158 #endif