system_error.hpp
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//
// system_error.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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