118 lines
2.4 KiB
C++
118 lines
2.4 KiB
C++
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//
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// system_error.hpp
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// ~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_SYSTEM_ERROR_HPP
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#define ASIO_SYSTEM_ERROR_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/push_options.hpp"
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#include "asio/detail/push_options.hpp"
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#include <boost/config.hpp>
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#include <boost/scoped_ptr.hpp>
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#include <cerrno>
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#include <exception>
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#include <string>
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#include "asio/detail/pop_options.hpp"
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#include "asio/error_code.hpp"
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namespace asio {
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/// The system_error class is used to represent system conditions that
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/// prevent the library from operating correctly.
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class system_error
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: public std::exception
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{
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public:
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/// Construct with an error code.
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system_error(const error_code& code)
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: code_(code),
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context_()
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{
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}
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/// Construct with an error code and context.
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system_error(const error_code& code, const std::string& context)
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: code_(code),
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context_(context)
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{
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}
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/// Copy constructor.
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system_error(const system_error& other)
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: std::exception(other),
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code_(other.code_),
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context_(other.context_),
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what_()
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{
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}
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/// Destructor.
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virtual ~system_error() throw ()
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{
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}
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/// Assignment operator.
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system_error& operator=(const system_error& e)
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{
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context_ = e.context_;
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code_ = e.code_;
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what_.reset();
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return *this;
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}
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/// Get a string representation of the exception.
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virtual const char* what() const throw ()
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{
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try
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{
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if (!what_)
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{
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std::string tmp(context_);
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if (tmp.length())
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tmp += ": ";
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tmp += code_.message();
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what_.reset(new std::string(tmp));
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}
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return what_->c_str();
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}
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catch (std::exception&)
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{
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return "system_error";
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}
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}
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/// Get the error code associated with the exception.
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error_code code() const
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{
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return code_;
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}
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private:
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// The code associated with the error.
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error_code code_;
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// The context associated with the error.
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std::string context_;
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// The string representation of the error.
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mutable boost::scoped_ptr<std::string> what_;
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};
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_SYSTEM_ERROR_HPP
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