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at_impl.hpp
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/*============================================================================= Copyright (c) 2001-2011 Joel de Guzman Copyright (c) 2005-2006 Dan Marsden Distributed under 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) ==============================================================================*/ #if !defined(BOOST_FUSION_STD_ARRAY_AT_IMPL_01062013_1700) #define BOOST_FUSION_STD_ARRAY_AT_IMPL_01062013_1700 #include <boost/type_traits/is_const.hpp> #include <boost/mpl/if.hpp> namespace boost { namespace fusion { struct std_array_tag; namespace extension { template<typename T> struct at_impl; template<> struct at_impl<std_array_tag> { template<typename Sequence, typename N> struct apply { typedef typename mpl::if_< is_const<Sequence>, typename Sequence::const_reference, typename Sequence::reference>::type type; static type call(Sequence& seq) { return seq[N::value]; } }; }; } }} #endif