Added boost header

test/external/boost/signals2/detail/variadic_slot_invoker.hpp

@@ -0,0 +1,123 @@
+/*
+  Helper class used by variadic implementation of variadic boost::signals2::signal.
+
+  Author: Frank Mori Hess <fmhess@users.sourceforge.net>
+  Begin: 2009-05-27
+*/
+// Copyright Frank Mori Hess 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_DETAIL_VARIADIC_SLOT_INVOKER_HPP
+#define BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP
+
+#include <boost/signals2/detail/variadic_arg_type.hpp>
+// if compiler has variadic template support, we assume they have
+// a variadic std::tuple implementation here.  We don't use boost::tuple
+// because it does not have variadic template support at present.
+#include <tuple>
+
+namespace boost
+{
+  namespace signals2
+  {
+    namespace detail
+    {
+      template<unsigned ... values> class unsigned_meta_array {};
+
+      template<typename UnsignedMetaArray, unsigned n> class unsigned_meta_array_appender;
+
+      template<unsigned n, unsigned ... Args>
+        class unsigned_meta_array_appender<unsigned_meta_array<Args...>, n>
+      {
+      public:
+        typedef unsigned_meta_array<Args..., n> type;
+      };
+
+      template<unsigned n> class make_unsigned_meta_array;
+
+      template<> class make_unsigned_meta_array<0>
+      {
+      public:
+        typedef unsigned_meta_array<> type;
+      };
+
+      template<> class make_unsigned_meta_array<1>
+      {
+      public:
+        typedef unsigned_meta_array<0> type;
+      };
+
+      template<unsigned n> class make_unsigned_meta_array
+      {
+      public:
+        typedef typename unsigned_meta_array_appender<typename make_unsigned_meta_array<n-1>::type, n - 1>::type type;
+      };
+
+      template<typename R>
+        class call_with_tuple_args
+      {
+      public:
+        typedef R result_type;
+
+        template<typename Func, typename ... Args>
+          R operator()(Func &func, std::tuple<Args...> args) const
+        {
+          typedef typename make_unsigned_meta_array<sizeof...(Args)>::type indices_type;
+          typename Func::result_type *resolver = 0;
+          return m_invoke(resolver, func, indices_type(), args);
+        }
+      private:
+        template<typename T, typename Func, unsigned ... indices, typename ... Args>
+          R m_invoke(T *, Func &func, unsigned_meta_array<indices...>, std::tuple<Args...> args) const
+        {
+          return func(std::get<indices>(args)...);
+        }
+        template<typename Func, unsigned ... indices, typename ... Args>
+          R m_invoke(void *, Func &func, unsigned_meta_array<indices...>, std::tuple<Args...> args) const
+        {
+          func(std::get<indices>(args)...);
+          return R();
+        }
+      };
+
+      template<typename R, typename ... Args>
+        class variadic_slot_invoker
+      {
+      public:
+        typedef R result_type;
+
+        variadic_slot_invoker(Args & ... args): _args(args...)
+        {}
+        template<typename ConnectionBodyType>
+          result_type operator ()(const ConnectionBodyType &connectionBody) const
+        {
+          result_type *resolver = 0;
+          return m_invoke(connectionBody,
+            resolver);
+        }
+      private:
+        template<typename ConnectionBodyType>
+        result_type m_invoke(const ConnectionBodyType &connectionBody,
+          const void_type *) const
+        {
+          return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
+          return void_type();
+        }
+        template<typename ConnectionBodyType>
+          result_type m_invoke(const ConnectionBodyType &connectionBody, ...) const
+        {
+          return call_with_tuple_args<result_type>()(connectionBody->slot.slot_function(), _args);
+        }
+        std::tuple<Args& ...> _args;
+      };
+    } // namespace detail
+  } // namespace signals2
+} // namespace boost
+
+
+#endif // BOOST_SIGNALS2_DETAIL_VARIADIC_SLOT_INVOKER_HPP