121 lines
2.2 KiB
C++
121 lines
2.2 KiB
C++
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//
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// error_handler.hpp
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// ~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2006 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_ERROR_HANDLER_HPP
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#define ASIO_ERROR_HANDLER_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/throw_exception.hpp>
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#include "asio/detail/pop_options.hpp"
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namespace asio {
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namespace detail {
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class ignore_error_t
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{
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public:
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typedef void result_type;
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template <typename Error>
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void operator()(const Error&) const
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{
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}
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};
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class throw_error_t
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{
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public:
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typedef void result_type;
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template <typename Error>
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void operator()(const Error& err) const
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{
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if (err)
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boost::throw_exception(err);
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}
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};
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template <typename Target>
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class assign_error_t
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{
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public:
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typedef void result_type;
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assign_error_t(Target& target)
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: target_(&target)
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{
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}
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template <typename Error>
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void operator()(const Error& err) const
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{
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*target_ = err;
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}
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private:
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Target* target_;
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};
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} // namespace detail
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/**
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* @defgroup error_handler Error Handler Function Objects
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*
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* Function objects for custom error handling.
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*/
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/*@{*/
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/// Return a function object that always ignores the error.
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#if defined(GENERATING_DOCUMENTATION)
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unspecified ignore_error();
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#else
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inline detail::ignore_error_t ignore_error()
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{
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return detail::ignore_error_t();
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}
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#endif
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/// Return a function object that always throws the error.
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#if defined(GENERATING_DOCUMENTATION)
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unspecified throw_error();
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#else
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inline detail::throw_error_t throw_error()
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{
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return detail::throw_error_t();
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}
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#endif
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/// Return a function object that assigns the error to a variable.
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#if defined(GENERATING_DOCUMENTATION)
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template <typename Target>
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unspecified assign_error(Target& target);
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#else
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template <typename Target>
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inline detail::assign_error_t<Target> assign_error(Target& target)
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{
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return detail::assign_error_t<Target>(target);
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}
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#endif
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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_ERROR_HANDLER_HPP
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