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// Boost.Signals2 library
// Copyright Frank Mori Hess 2007-2008.
// 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)
// For more information, see http://www.boost.org
#ifndef BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP
#define BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP
#include <boost/shared_ptr.hpp>
#include <boost/signals2/connection.hpp>
#include <boost/weak_ptr.hpp>
namespace boost
{
namespace signals2
{
class shared_connection_block
{
public:
shared_connection_block(const signals2::connection &conn = signals2::connection(),
bool initially_blocked = true):
_weak_connection_body(conn._weak_connection_body)
{
if(initially_blocked) block();
}
void block()
{
if(blocking()) return;
boost::shared_ptr<detail::connection_body_base> connection_body(_weak_connection_body.lock());
if(connection_body == 0)
{
// Make _blocker non-empty so the blocking() method still returns the correct value
// after the connection has expired.
_blocker.reset(static_cast<int*>(0));
return;
}
_blocker = connection_body->get_blocker();
}
void unblock()
{
_blocker.reset();
}
bool blocking() const
{
shared_ptr<void> empty;
return _blocker < empty || empty < _blocker;
}
signals2::connection connection() const
{
return signals2::connection(_weak_connection_body);
}
private:
boost::weak_ptr<detail::connection_body_base> _weak_connection_body;
shared_ptr<void> _blocker;
};
}
} // end namespace boost
#endif // BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP