deluge/include/libtorrent/asio/completion_condition.hpp

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2007-01-07 22:50:11 +00:00
//
// completion_condition.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2006 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_COMPLETION_CONDITION_HPP
#define ASIO_COMPLETION_CONDITION_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <cstddef>
#include <boost/config.hpp>
#include "asio/detail/pop_options.hpp"
namespace asio {
namespace detail {
class transfer_all_t
{
public:
typedef bool result_type;
template <typename Error>
bool operator()(const Error& err, std::size_t)
{
return !!err;
}
};
class transfer_at_least_t
{
public:
typedef bool result_type;
explicit transfer_at_least_t(std::size_t minimum)
: minimum_(minimum)
{
}
template <typename Error>
bool operator()(const Error& err, std::size_t bytes_transferred)
{
return !!err || bytes_transferred >= minimum_;
}
private:
std::size_t minimum_;
};
} // namespace detail
/**
* @defgroup completion_condition Completion Condition Function Objects
*
* Function objects used for determining when a read or write operation should
* complete.
*/
/*@{*/
/// Return a completion condition function object that indicates that a read or
/// write operation should continue until all of the data has been transferred,
/// or until an error occurs.
#if defined(GENERATING_DOCUMENTATION)
unspecified transfer_all();
#else
inline detail::transfer_all_t transfer_all()
{
return detail::transfer_all_t();
}
#endif
/// Return a completion condition function object that indicates that a read or
/// write operation should continue until a minimum number of bytes has been
/// transferred, or until an error occurs.
#if defined(GENERATING_DOCUMENTATION)
unspecified transfer_at_least(std::size_t minimum);
#else
inline detail::transfer_at_least_t transfer_at_least(std::size_t minimum)
{
return detail::transfer_at_least_t(minimum);
}
#endif
/*@}*/
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_COMPLETION_CONDITION_HPP