/usr/include/boost/asio/basic_io_object.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
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// basic_io_object.hpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2013 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 BOOST_ASIO_BASIC_IO_OBJECT_HPP
#define BOOST_ASIO_BASIC_IO_OBJECT_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
#if defined(BOOST_ASIO_HAS_MOVE)
namespace detail
{
// Type trait used to determine whether a service supports move.
template <typename IoObjectService>
class service_has_move
{
private:
typedef IoObjectService service_type;
typedef typename service_type::implementation_type implementation_type;
template <typename T, typename U>
static auto eval(T* t, U* u) -> decltype(t->move_construct(*u, *u), char());
static char (&eval(...))[2];
public:
static const bool value =
sizeof(service_has_move::eval(
static_cast<service_type*>(0),
static_cast<implementation_type*>(0))) == 1;
};
}
#endif // defined(BOOST_ASIO_HAS_MOVE)
/// Base class for all I/O objects.
/**
* @note All I/O objects are non-copyable. However, when using C++0x, certain
* I/O objects do support move construction and move assignment.
*/
#if !defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
template <typename IoObjectService>
#else
template <typename IoObjectService,
bool Movable = detail::service_has_move<IoObjectService>::value>
#endif
class basic_io_object
{
public:
/// The type of the service that will be used to provide I/O operations.
typedef IoObjectService service_type;
/// The underlying implementation type of I/O object.
typedef typename service_type::implementation_type implementation_type;
/// Get the io_service associated with the object.
/**
* This function may be used to obtain the io_service object that the I/O
* object uses to dispatch handlers for asynchronous operations.
*
* @return A reference to the io_service object that the I/O object will use
* to dispatch handlers. Ownership is not transferred to the caller.
*/
boost::asio::io_service& get_io_service()
{
return service.get_io_service();
}
protected:
/// Construct a basic_io_object.
/**
* Performs:
* @code get_service().construct(get_implementation()); @endcode
*/
explicit basic_io_object(boost::asio::io_service& io_service)
: service(boost::asio::use_service<IoObjectService>(io_service))
{
service.construct(implementation);
}
#if defined(GENERATING_DOCUMENTATION)
/// Move-construct a basic_io_object.
/**
* Performs:
* @code get_service().move_construct(
* get_implementation(), other.get_implementation()); @endcode
*
* @note Available only for services that support movability,
*/
basic_io_object(basic_io_object&& other);
/// Move-assign a basic_io_object.
/**
* Performs:
* @code get_service().move_assign(get_implementation(),
* other.get_service(), other.get_implementation()); @endcode
*
* @note Available only for services that support movability,
*/
basic_io_object& operator=(basic_io_object&& other);
#endif // defined(GENERATING_DOCUMENTATION)
/// Protected destructor to prevent deletion through this type.
/**
* Performs:
* @code get_service().destroy(get_implementation()); @endcode
*/
~basic_io_object()
{
service.destroy(implementation);
}
/// Get the service associated with the I/O object.
service_type& get_service()
{
return service;
}
/// Get the service associated with the I/O object.
const service_type& get_service() const
{
return service;
}
/// (Deprecated: Use get_service().) The service associated with the I/O
/// object.
/**
* @note Available only for services that do not support movability.
*/
service_type& service;
/// Get the underlying implementation of the I/O object.
implementation_type& get_implementation()
{
return implementation;
}
/// Get the underlying implementation of the I/O object.
const implementation_type& get_implementation() const
{
return implementation;
}
/// (Deprecated: Use get_implementation().) The underlying implementation of
/// the I/O object.
implementation_type implementation;
private:
basic_io_object(const basic_io_object&);
basic_io_object& operator=(const basic_io_object&);
};
#if defined(BOOST_ASIO_HAS_MOVE)
// Specialisation for movable objects.
template <typename IoObjectService>
class basic_io_object<IoObjectService, true>
{
public:
typedef IoObjectService service_type;
typedef typename service_type::implementation_type implementation_type;
boost::asio::io_service& get_io_service()
{
return service_->get_io_service();
}
protected:
explicit basic_io_object(boost::asio::io_service& io_service)
: service_(&boost::asio::use_service<IoObjectService>(io_service))
{
service_->construct(implementation);
}
basic_io_object(basic_io_object&& other)
: service_(&other.get_service())
{
service_->move_construct(implementation, other.implementation);
}
~basic_io_object()
{
service_->destroy(implementation);
}
basic_io_object& operator=(basic_io_object&& other)
{
service_->move_assign(implementation,
*other.service_, other.implementation);
service_ = other.service_;
return *this;
}
service_type& get_service()
{
return *service_;
}
const service_type& get_service() const
{
return *service_;
}
implementation_type& get_implementation()
{
return implementation;
}
const implementation_type& get_implementation() const
{
return implementation;
}
implementation_type implementation;
private:
basic_io_object(const basic_io_object&);
void operator=(const basic_io_object&);
IoObjectService* service_;
};
#endif // defined(BOOST_ASIO_HAS_MOVE)
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_BASIC_IO_OBJECT_HPP
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