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+//
+// system_error.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SYSTEM_ERROR_HPP
+#define ASIO_SYSTEM_ERROR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_STD_SYSTEM_ERROR)
+# include <system_error>
+#else // defined(ASIO_HAS_STD_SYSTEM_ERROR)
+# include <cerrno>
+# include <exception>
+# include <string>
+# include "asio/error_code.hpp"
+# include "asio/detail/scoped_ptr.hpp"
+#endif // defined(ASIO_HAS_STD_SYSTEM_ERROR)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+#if defined(ASIO_HAS_STD_SYSTEM_ERROR)
+
+typedef std::system_error system_error;
+
+#else // defined(ASIO_HAS_STD_SYSTEM_ERROR)
+
+/// The system_error class is used to represent system conditions that
+/// prevent the library from operating correctly.
+class system_error
+ : public std::exception
+{
+public:
+ /// Construct with an error code.
+ system_error(const error_code& ec)
+ : code_(ec),
+ context_()
+ {
+ }
+
+ /// Construct with an error code and context.
+ system_error(const error_code& ec, const std::string& context)
+ : code_(ec),
+ context_(context)
+ {
+ }
+
+ /// Copy constructor.
+ system_error(const system_error& other)
+ : std::exception(other),
+ code_(other.code_),
+ context_(other.context_),
+ what_()
+ {
+ }
+
+ /// Destructor.
+ virtual ~system_error() throw ()
+ {
+ }
+
+ /// Assignment operator.
+ system_error& operator=(const system_error& e)
+ {
+ context_ = e.context_;
+ code_ = e.code_;
+ what_.reset();
+ return *this;
+ }
+
+ /// Get a string representation of the exception.
+ virtual const char* what() const throw ()
+ {
+#if !defined(ASIO_NO_EXCEPTIONS)
+ try
+#endif // !defined(ASIO_NO_EXCEPTIONS)
+ {
+ if (!what_.get())
+ {
+ std::string tmp(context_);
+ if (tmp.length())
+ tmp += ": ";
+ tmp += code_.message();
+ what_.reset(new std::string(tmp));
+ }
+ return what_->c_str();
+ }
+#if !defined(ASIO_NO_EXCEPTIONS)
+ catch (std::exception&)
+ {
+ return "system_error";
+ }
+#endif // !defined(ASIO_NO_EXCEPTIONS)
+ }
+
+ /// Get the error code associated with the exception.
+ error_code code() const
+ {
+ return code_;
+ }
+
+private:
+ // The code associated with the error.
+ error_code code_;
+
+ // The context associated with the error.
+ std::string context_;
+
+ // The string representation of the error.
+ mutable asio::detail::scoped_ptr<std::string> what_;
+};
+
+#endif // defined(ASIO_HAS_STD_SYSTEM_ERROR)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SYSTEM_ERROR_HPP