/usr/include/deal.II/base/std_cxx1x/tuple.h is in libdeal.ii-dev 8.1.0-6ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: tuple.h 31349 2013-10-20 19:07:06Z maier $
//
// Copyright (C) 2009 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__std_cxx1x_tuple_h
#define __deal2__std_cxx1x_tuple_h
#include <deal.II/base/config.h>
#ifdef DEAL_II_USE_CXX11
# include <tuple>
DEAL_II_NAMESPACE_OPEN
namespace std_cxx1x
{
using std::tuple;
using std::get;
using std::tuple_size;
using std::tuple_element;
}
DEAL_II_NAMESPACE_CLOSE
#else
#include <boost/tuple/tuple.hpp>
DEAL_II_NAMESPACE_OPEN
namespace std_cxx1x
{
using boost::tuple;
using boost::get;
// boost::tuples::length has been renamed
// by the standard to std::tuple_size
template <typename T>
struct tuple_size
{
static const std::size_t value = boost::tuples::length<T>::value;
};
// similarly, boost::tuples::element has
// been renamed by the standard to
// std::tuple_element
template <int N, typename T>
struct tuple_element
{
typedef typename boost::tuples::element<N,T>::type type;
};
}
DEAL_II_NAMESPACE_CLOSE
#endif
#endif
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