Added boost header

test/external/boost/signals2/signal.hpp

@@ -0,0 +1,41 @@
+//  A thread-safe version of Boost.Signals.
+
+// Copyright Frank Mori Hess 2007-2009
+//
+// 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_SIGNAL_HPP
+#define BOOST_SIGNALS2_SIGNAL_HPP
+
+#include <algorithm>
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/function.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/signals2/connection.hpp>
+#include <boost/signals2/detail/unique_lock.hpp>
+#include <boost/signals2/detail/replace_slot_function.hpp>
+#include <boost/signals2/detail/result_type_wrapper.hpp>
+#include <boost/signals2/detail/signals_common.hpp>
+#include <boost/signals2/detail/signals_common_macros.hpp>
+#include <boost/signals2/detail/slot_groups.hpp>
+#include <boost/signals2/detail/slot_call_iterator.hpp>
+#include <boost/signals2/optional_last_value.hpp>
+#include <boost/signals2/mutex.hpp>
+#include <boost/signals2/slot.hpp>
+#include <boost/throw_exception.hpp>
+#include <functional>
+
+#ifdef BOOST_NO_VARIADIC_TEMPLATES
+#include <boost/signals2/preprocessed_signal.hpp>
+#else
+#include <boost/signals2/variadic_signal.hpp>
+#endif
+
+#endif // BOOST_SIGNALS2_SIGNAL_HPP