/usr/include/deal.II/base/std_cxx1x/type_traits.h is in libdeal.ii-dev 8.1.0-4.
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: type_traits.h 31349 2013-10-20 19:07:06Z maier $
//
// Copyright (C) 2012 - 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_type_traits_h
#define __deal2__std_cxx1x_type_traits_h
#include <deal.II/base/config.h>
#ifdef DEAL_II_USE_CXX11
# include <type_traits>
DEAL_II_NAMESPACE_OPEN
namespace std_cxx1x
{
// TODO: could fill up with more types from
// C++11 type traits
using std::is_pod;
using std::is_standard_layout;
using std::is_trivial;
}
DEAL_II_NAMESPACE_CLOSE
#else
#include <boost/type_traits.hpp>
DEAL_II_NAMESPACE_OPEN
namespace std_cxx1x
{
using boost::is_pod;
// boost does not have is_standard_layout and
// is_trivial, but those are both a subset of
// is_pod
template <typename T>
struct is_standard_layout
{
static const bool value = boost::is_pod<T>::value;
};
template <typename T>
struct is_trivial
{
static const bool value = boost::has_trivial_copy<T>::value &&
boost::has_trivial_assign<T>::value &&
boost::has_trivial_constructor<T>::value &&
boost::has_trivial_destructor<T>::value;
};
}
DEAL_II_NAMESPACE_CLOSE
#endif
#endif
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