updated boost on windows

winx64/include/boost/outcome/experimental/status-code/posix_code.hpp

@@ -0,0 +1,151 @@
+/* Proposed SG14 status_code
+(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
+File Created: Feb 2018
+
+
+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_SYSTEM_ERROR2_POSIX_CODE_HPP
+#define BOOST_OUTCOME_SYSTEM_ERROR2_POSIX_CODE_HPP
+
+#include "generic_code.hpp"
+
+#include <cstring>  // for strchr and strerror_r
+
+BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
+
+class _posix_code_domain;
+//! A POSIX error code, those returned by `errno`.
+using posix_code = status_code<_posix_code_domain>;
+//! A specialisation of `status_error` for the POSIX error code domain.
+using posix_error = status_error<_posix_code_domain>;
+
+/*! The implementation of the domain for POSIX error codes, those returned by `errno`.
+*/
+class _posix_code_domain : public status_code_domain
+{
+  template <class DomainType> friend class status_code;
+  template <class StatusCode> friend class detail::indirecting_domain;
+  using _base = status_code_domain;
+
+  static _base::string_ref _make_string_ref(int c) noexcept
+  {
+    char buffer[1024] = "";
+#ifdef _WIN32
+    strerror_s(buffer, sizeof(buffer), c);
+#elif defined(__linux__)
+    char *s = strerror_r(c, buffer, sizeof(buffer));  // NOLINT
+    if(s != nullptr)
+    {
+      strncpy(buffer, s, sizeof(buffer));  // NOLINT
+      buffer[1023] = 0;
+    }
+#else
+    strerror_r(c, buffer, sizeof(buffer));
+#endif
+    size_t length = strlen(buffer);  // NOLINT
+    auto *p = static_cast<char *>(malloc(length + 1));  // NOLINT
+    if(p == nullptr)
+    {
+      return _base::string_ref("failed to get message from system");
+    }
+    memcpy(p, buffer, length + 1);  // NOLINT
+    return _base::atomic_refcounted_string_ref(p, length);
+  }
+
+public:
+  //! The value type of the POSIX code, which is an `int`
+  using value_type = int;
+  using _base::string_ref;
+
+  //! Default constructor
+  constexpr explicit _posix_code_domain(typename _base::unique_id_type id = 0xa59a56fe5f310933) noexcept : _base(id) {}
+  _posix_code_domain(const _posix_code_domain &) = default;
+  _posix_code_domain(_posix_code_domain &&) = default;
+  _posix_code_domain &operator=(const _posix_code_domain &) = default;
+  _posix_code_domain &operator=(_posix_code_domain &&) = default;
+  ~_posix_code_domain() = default;
+
+  //! Constexpr singleton getter. Returns constexpr posix_code_domain variable.
+  static inline constexpr const _posix_code_domain &get();
+
+  virtual string_ref name() const noexcept override { return string_ref("posix domain"); }  // NOLINT
+protected:
+  virtual bool _do_failure(const status_code<void> &code) const noexcept override  // NOLINT
+  {
+    assert(code.domain() == *this);  // NOLINT
+    return static_cast<const posix_code &>(code).value() != 0;  // NOLINT
+  }
+  virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override  // NOLINT
+  {
+    assert(code1.domain() == *this);  // NOLINT
+    const auto &c1 = static_cast<const posix_code &>(code1);  // NOLINT
+    if(code2.domain() == *this)
+    {
+      const auto &c2 = static_cast<const posix_code &>(code2);  // NOLINT
+      return c1.value() == c2.value();
+    }
+    if(code2.domain() == generic_code_domain)
+    {
+      const auto &c2 = static_cast<const generic_code &>(code2);  // NOLINT
+      if(static_cast<int>(c2.value()) == c1.value())
+      {
+        return true;
+      }
+    }
+    return false;
+  }
+  virtual generic_code _generic_code(const status_code<void> &code) const noexcept override  // NOLINT
+  {
+    assert(code.domain() == *this);  // NOLINT
+    const auto &c = static_cast<const posix_code &>(code);  // NOLINT
+    return generic_code(static_cast<errc>(c.value()));
+  }
+  virtual string_ref _do_message(const status_code<void> &code) const noexcept override  // NOLINT
+  {
+    assert(code.domain() == *this);  // NOLINT
+    const auto &c = static_cast<const posix_code &>(code);  // NOLINT
+    return _make_string_ref(c.value());
+  }
+#if defined(_CPPUNWIND) || defined(__EXCEPTIONS) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
+  BOOST_OUTCOME_SYSTEM_ERROR2_NORETURN virtual void _do_throw_exception(const status_code<void> &code) const override  // NOLINT
+  {
+    assert(code.domain() == *this);  // NOLINT
+    const auto &c = static_cast<const posix_code &>(code);  // NOLINT
+    throw status_error<_posix_code_domain>(c);
+  }
+#endif
+};
+//! A constexpr source variable for the POSIX code domain, which is that of `errno`. Returned by `_posix_code_domain::get()`.
+constexpr _posix_code_domain posix_code_domain;
+inline constexpr const _posix_code_domain &_posix_code_domain::get()
+{
+  return posix_code_domain;
+}
+
+BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
+
+#endif