premiere-libtorrent/include/libtorrent/variant_stream.hpp

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// Copyright Daniel Wallin and Arvid Norberg 2007.
// Use, modification and distribution is
// subject to 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 VARIANT_STREAM_070211_HPP
# define VARIANT_STREAM_070211_HPP
# include <boost/variant.hpp>
# include <boost/mpl/vector.hpp>
# include <boost/mpl/void.hpp>
# include <boost/mpl/remove.hpp>
# include <boost/mpl/transform.hpp>
# include <boost/mpl/size.hpp>
# include <boost/preprocessor/repetition/enum_params.hpp>
# include <boost/preprocessor/repetition/enum_binary_params.hpp>
# include <boost/preprocessor/facilities/intercept.hpp>
# include <boost/type_traits/add_pointer.hpp>
# include <boost/noncopyable.hpp>
#include <asio/io_service.hpp>
# define NETWORK_VARIANT_STREAM_LIMIT 5
namespace libtorrent {
namespace aux
{
struct delete_visitor
: boost::static_visitor<>
{
template <class T>
void operator()(T* p) const
{
delete p;
}
void operator()(boost::blank) const
{}
};
// -------------- io_control -----------
template<class IO_Control_Command>
struct io_control_visitor_ec: boost::static_visitor<>
{
io_control_visitor_ec(IO_Control_Command& ioc, asio::error_code& ec)
: ioc(ioc), ec(ec) {}
template <class T>
void operator()(T* p) const
{
p->io_control(ioc, ec);
}
void operator()(boost::blank) const
{}
IO_Control_Command& ioc;
asio::error_code& ec;
};
template<class IO_Control_Command>
struct io_control_visitor
: boost::static_visitor<>
{
io_control_visitor(IO_Control_Command& ioc)
: ioc(ioc) {}
template <class T>
void operator()(T* p) const
{
p->io_control(ioc);
}
void operator()(boost::blank) const
{}
IO_Control_Command& ioc;
};
// -------------- async_connect -----------
template <class EndpointType, class Handler>
struct async_connect_visitor
: boost::static_visitor<>
{
async_connect_visitor(EndpointType const& endpoint, Handler const& handler)
: endpoint(endpoint)
, handler(handler)
{}
template <class T>
void operator()(T* p) const
{
p->async_connect(endpoint, handler);
}
void operator()(boost::blank) const
{}
EndpointType const& endpoint;
Handler const& handler;
};
// -------------- bind -----------
template <class EndpointType, class Error_Handler = boost::mpl::void_>
struct bind_visitor
: boost::static_visitor<>
{
bind_visitor(EndpointType const& ep, Error_Handler const& error_handler)
: endpoint(ep)
, error_handler(error_handler)
{}
template <class T>
void operator()(T* p) const
{
p->bind(endpoint, error_handler);
}
void operator()(boost::blank) const
{}
EndpointType const& endpoint;
Error_Handler const& error_handler;
};
template <class EndpointType>
struct bind_visitor<EndpointType, boost::mpl::void_>
: boost::static_visitor<>
{
bind_visitor(EndpointType const& ep)
: endpoint(ep)
{}
template <class T>
void operator()(T* p) const
{
p->bind(endpoint);
}
void operator()(boost::blank) const
{}
EndpointType const& endpoint;
};
// -------------- open -----------
template <class Protocol, class Error_Handler = boost::mpl::void_>
struct open_visitor
: boost::static_visitor<>
{
open_visitor(Protocol const& p, Error_Handler const& error_handler)
: proto(p)
, error_handler(error_handler)
{}
template <class T>
void operator()(T* p) const
{
p->open(proto, error_handler);
}
void operator()(boost::blank) const
{}
Protocol const& proto;
Error_Handler const& error_handler;
};
template <class Protocol>
struct open_visitor<Protocol, boost::mpl::void_>
: boost::static_visitor<>
{
open_visitor(Protocol const& p)
: proto(p)
{}
template <class T>
void operator()(T* p) const
{
p->open(proto);
}
void operator()(boost::blank) const
{}
Protocol const& proto;
};
// -------------- close -----------
template <class Error_Handler = boost::mpl::void_>
struct close_visitor
: boost::static_visitor<>
{
close_visitor(Error_Handler const& error_handler)
: error_handler(error_handler)
{}
template <class T>
void operator()(T* p) const
{
p->close(error_handler);
}
void operator()(boost::blank) const
{}
Error_Handler const& error_handler;
};
template <>
struct close_visitor<boost::mpl::void_>
: boost::static_visitor<>
{
template <class T>
void operator()(T* p) const
{
p->close();
}
void operator()(boost::blank) const
{}
};
// -------------- remote_endpoint -----------
template <class EndpointType, class Error_Handler = boost::mpl::void_>
struct remote_endpoint_visitor
: boost::static_visitor<EndpointType>
{
remote_endpoint_visitor(Error_Handler const& error_handler)
: error_handler(error_handler)
{}
template <class T>
EndpointType operator()(T* p) const
{
return p->remote_endpoint(error_handler);
}
EndpointType operator()(boost::blank) const
{
return EndpointType();
}
Error_Handler const& error_handler;
};
template <class EndpointType>
struct remote_endpoint_visitor<EndpointType, boost::mpl::void_>
: boost::static_visitor<EndpointType>
{
template <class T>
EndpointType operator()(T* p) const
{
return p->remote_endpoint();
}
EndpointType operator()(boost::blank) const
{
return EndpointType();
}
};
// -------------- local_endpoint -----------
template <class EndpointType, class Error_Handler = boost::mpl::void_>
struct local_endpoint_visitor
: boost::static_visitor<EndpointType>
{
local_endpoint_visitor(Error_Handler const& error_handler)
: error_handler(error_handler)
{}
template <class T>
EndpointType operator()(T* p) const
{
return p->local_endpoint(error_handler);
}
EndpointType operator()(boost::blank) const
{
return EndpointType();
}
Error_Handler const& error_handler;
};
template <class EndpointType>
struct local_endpoint_visitor<EndpointType, boost::mpl::void_>
: boost::static_visitor<EndpointType>
{
template <class T>
EndpointType operator()(T* p) const
{
return p->local_endpoint();
}
EndpointType operator()(boost::blank) const
{
return EndpointType();
}
};
// -------------- async_read_some -----------
template <class Mutable_Buffers, class Handler>
struct async_read_some_visitor
: boost::static_visitor<>
{
async_read_some_visitor(Mutable_Buffers const& buffers, Handler const& handler)
: buffers(buffers)
, handler(handler)
{}
template <class T>
void operator()(T* p) const
{
p->async_read_some(buffers, handler);
}
void operator()(boost::blank) const
{}
Mutable_Buffers const& buffers;
Handler const& handler;
};
// -------------- read_some -----------
template <class Mutable_Buffers>
struct read_some_visitor
: boost::static_visitor<std::size_t>
{
read_some_visitor(Mutable_Buffers const& buffers)
: buffers(buffers)
{}
template <class T>
std::size_t operator()(T* p) const
{ return p->read_some(buffers); }
std::size_t operator()(boost::blank) const
{ return 0; }
Mutable_Buffers const& buffers;
};
template <class Mutable_Buffers>
struct read_some_visitor_ec
: boost::static_visitor<std::size_t>
{
read_some_visitor_ec(Mutable_Buffers const& buffers, asio::error_code& ec)
: buffers(buffers)
, ec(ec)
{}
template <class T>
std::size_t operator()(T* p) const
{ return p->read_some(buffers, ec); }
std::size_t operator()(boost::blank) const
{ return 0; }
Mutable_Buffers const& buffers;
asio::error_code& ec;
};
// -------------- async_write_some -----------
template <class Const_Buffers, class Handler>
struct async_write_some_visitor
: boost::static_visitor<>
{
async_write_some_visitor(Const_Buffers const& buffers, Handler const& handler)
: buffers(buffers)
, handler(handler)
{}
template <class T>
void operator()(T* p) const
{
p->async_write_some(buffers, handler);
}
void operator()(boost::blank) const
{}
Const_Buffers const& buffers;
Handler const& handler;
};
// -------------- in_avail -----------
template <class Error_Handler = boost::mpl::void_>
struct in_avail_visitor
: boost::static_visitor<std::size_t>
{
in_avail_visitor(Error_Handler const& error_handler)
: error_handler(error_handler)
{}
template <class T>
std::size_t operator()(T* p) const
{
return p->in_avail(error_handler);
}
std::size_t operator()(boost::blank) const
{
return 0;
}
Error_Handler const& error_handler;
};
template <>
struct in_avail_visitor<boost::mpl::void_>
: boost::static_visitor<std::size_t>
{
template <class T>
std::size_t operator()(T* p) const
{
return p->in_avail();
}
void operator()(boost::blank) const
{}
};
// -------------- io_service -----------
template <class IOService>
struct io_service_visitor
: boost::static_visitor<IOService&>
{
template <class T>
IOService& operator()(T* p) const
{
return p->io_service();
}
IOService& operator()(boost::blank) const
{
return *(IOService*)0;
}
};
// -------------- lowest_layer -----------
template <class LowestLayer>
struct lowest_layer_visitor
: boost::static_visitor<LowestLayer&>
{
template <class T>
LowestLayer& operator()(T* p) const
{
return p->lowest_layer();
}
LowestLayer& operator()(boost::blank) const
{
return *(LowestLayer*)0;
}
};
} // namespace aux
template <
BOOST_PP_ENUM_BINARY_PARAMS(
NETWORK_VARIANT_STREAM_LIMIT, class S, = boost::mpl::void_ BOOST_PP_INTERCEPT
)
>
class variant_stream : boost::noncopyable
{
public:
typedef BOOST_PP_CAT(boost::mpl::vector, NETWORK_VARIANT_STREAM_LIMIT)<
BOOST_PP_ENUM_PARAMS(NETWORK_VARIANT_STREAM_LIMIT, S)
> types0;
typedef typename boost::mpl::remove<types0, boost::mpl::void_>::type types;
typedef typename boost::make_variant_over<
typename boost::mpl::push_back<
typename boost::mpl::transform<
types
, boost::add_pointer<boost::mpl::_>
>::type
, boost::blank
>::type
>::type variant_type;
typedef typename S0::lowest_layer_type lowest_layer_type;
typedef typename S0::endpoint_type endpoint_type;
typedef typename S0::protocol_type protocol_type;
explicit variant_stream(asio::io_service& io_service)
: m_io_service(io_service)
, m_variant(boost::blank())
{}
template <class S>
void instantiate()
{
std::auto_ptr<S> owned(new S(m_io_service));
boost::apply_visitor(aux::delete_visitor(), m_variant);
m_variant = owned.get();
owned.release();
}
template <class S>
S& get()
{
return *boost::get<S*>(m_variant);
}
bool instantiated() const
{
return m_variant.which() != boost::mpl::size<types>::value;
}
~variant_stream()
{
boost::apply_visitor(aux::delete_visitor(), m_variant);
}
template <class Mutable_Buffers>
std::size_t read_some(Mutable_Buffers const& buffers, asio::error_code& ec)
{
assert(instantiated());
return boost::apply_visitor(
aux::read_some_visitor_ec<Mutable_Buffers>(buffers, ec)
, m_variant
);
}
template <class Mutable_Buffers>
std::size_t read_some(Mutable_Buffers const& buffers)
{
assert(instantiated());
return boost::apply_visitor(
aux::read_some_visitor<Mutable_Buffers>(buffers)
, m_variant
);
}
template <class Mutable_Buffers, class Handler>
void async_read_some(Mutable_Buffers const& buffers, Handler const& handler)
{
assert(instantiated());
boost::apply_visitor(
aux::async_read_some_visitor<Mutable_Buffers, Handler>(buffers, handler)
, m_variant
);
}
template <class Const_Buffers, class Handler>
void async_write_some(Const_Buffers const& buffers, Handler const& handler)
{
assert(instantiated());
boost::apply_visitor(
aux::async_write_some_visitor<Const_Buffers, Handler>(buffers, handler)
, m_variant
);
}
template <class Handler>
void async_connect(endpoint_type const& endpoint, Handler const& handler)
{
assert(instantiated());
boost::apply_visitor(
aux::async_connect_visitor<endpoint_type, Handler>(endpoint, handler), m_variant
);
}
template <class IO_Control_Command>
void io_control(IO_Control_Command& ioc)
{
assert(instantiated());
boost::apply_visitor(
aux::io_control_visitor<IO_Control_Command>(ioc), m_variant
);
}
template <class IO_Control_Command>
void io_control(IO_Control_Command& ioc, asio::error_code& ec)
{
assert(instantiated());
boost::apply_visitor(
aux::io_control_visitor_ec<IO_Control_Command>(ioc, ec)
, m_variant
);
}
void bind(endpoint_type const& endpoint)
{
assert(instantiated());
boost::apply_visitor(aux::bind_visitor<endpoint_type>(endpoint), m_variant);
}
template <class Error_Handler>
void bind(endpoint_type const& endpoint, Error_Handler const& error_handler)
{
assert(instantiated());
boost::apply_visitor(
aux::bind_visitor<endpoint_type, Error_Handler>(endpoint, error_handler), m_variant
);
}
void open(protocol_type const& p)
{
assert(instantiated());
boost::apply_visitor(aux::open_visitor<protocol_type>(p), m_variant);
}
template <class Error_Handler>
void open(protocol_type const& p, Error_Handler const& error_handler)
{
assert(instantiated());
boost::apply_visitor(
aux::open_visitor<protocol_type, Error_Handler>(p, error_handler), m_variant
);
}
void close()
{
assert(instantiated());
boost::apply_visitor(aux::close_visitor<>(), m_variant);
}
template <class Error_Handler>
void close(Error_Handler const& error_handler)
{
assert(instantiated());
boost::apply_visitor(
aux::close_visitor<Error_Handler>(error_handler), m_variant
);
}
std::size_t in_avail()
{
assert(instantiated());
return boost::apply_visitor(aux::in_avail_visitor<>(), m_variant);
}
template <class Error_Handler>
std::size_t in_avail(Error_Handler const& error_handler)
{
assert(instantiated());
return boost::apply_visitor(
aux::in_avail_visitor<Error_Handler>(error_handler), m_variant
);
}
endpoint_type remote_endpoint()
{
assert(instantiated());
return boost::apply_visitor(aux::remote_endpoint_visitor<endpoint_type>(), m_variant);
}
template <class Error_Handler>
endpoint_type remote_endpoint(Error_Handler const& error_handler)
{
assert(instantiated());
return boost::apply_visitor(
aux::remote_endpoint_visitor<endpoint_type, Error_Handler>(error_handler), m_variant
);
}
endpoint_type local_endpoint()
{
assert(instantiated());
return boost::apply_visitor(aux::local_endpoint_visitor<endpoint_type>(), m_variant);
}
template <class Error_Handler>
endpoint_type local_endpoint(Error_Handler const& error_handler)
{
assert(instantiated());
return boost::apply_visitor(
aux::local_endpoint_visitor<endpoint_type, Error_Handler>(error_handler), m_variant
);
}
asio::io_service& io_service()
{
assert(instantiated());
return boost::apply_visitor(
aux::io_service_visitor<asio::io_service>(), m_variant
);
}
lowest_layer_type& lowest_layer()
{
assert(instantiated());
return boost::apply_visitor(
aux::lowest_layer_visitor<lowest_layer_type>(), m_variant
);
}
private:
asio::io_service& m_io_service;
variant_type m_variant;
};
} // namespace libtorrent
#endif // VARIANT_STREAM_070211_HPP