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+// TR1 functional -*- C++ -*-
+
+// Copyright (C) 2005 Free Software Foundation, Inc.
+// Written by Douglas Gregor <doug.gregor -at- gmail.com>
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING. If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction. Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License. This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+/** @file mu_iterate.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+// Determine the result type when we pass the arguments along. This
+// involves passing along the cv-qualifiers placed on _Mu and
+// unwrapping the argument bundle.
+template<typename _CVMu, typename _CVArg
+ _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
+class result<_CVMu(_CVArg, tuple<_GLIBCXX_TEMPLATE_ARGS>)>
+ : public result_of<_CVArg(_GLIBCXX_TEMPLATE_ARGS)> { };
+
+template<typename _CVArg _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
+typename result_of<_CVArg(_GLIBCXX_TEMPLATE_ARGS)>::type
+operator()(_CVArg& __arg, const tuple<_GLIBCXX_TEMPLATE_ARGS>& __tuple)
+ const volatile
+{
+ return __arg(_GLIBCXX_MU_GET_TUPLE_ARGS);
+}
+