65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
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// Boost.Signals2 library
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// Copyright Frank Mori Hess 2007-2008.
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// Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org
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#ifndef BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP
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#define BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP
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#include <boost/shared_ptr.hpp>
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#include <boost/signals2/connection.hpp>
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#include <boost/weak_ptr.hpp>
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namespace boost
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{
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namespace signals2
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{
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class shared_connection_block
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{
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public:
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shared_connection_block(const signals2::connection &conn = signals2::connection(),
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bool initially_blocked = true):
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_weak_connection_body(conn._weak_connection_body)
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{
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if(initially_blocked) block();
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}
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void block()
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{
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if(blocking()) return;
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boost::shared_ptr<detail::connection_body_base> connection_body(_weak_connection_body.lock());
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if(connection_body == 0)
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{
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// Make _blocker non-empty so the blocking() method still returns the correct value
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// after the connection has expired.
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_blocker.reset(static_cast<int*>(0));
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return;
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}
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_blocker = connection_body->get_blocker();
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}
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void unblock()
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{
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_blocker.reset();
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}
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bool blocking() const
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{
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shared_ptr<void> empty;
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return _blocker < empty || empty < _blocker;
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}
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signals2::connection connection() const
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{
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return signals2::connection(_weak_connection_body);
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}
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private:
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boost::weak_ptr<detail::connection_body_base> _weak_connection_body;
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shared_ptr<void> _blocker;
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};
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}
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} // end namespace boost
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#endif // BOOST_SIGNALS2_SHARED_CONNECTION_BLOCK_HPP
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