/usr/include/boost/xpressive/detail/static/type_traits.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// type_traits.hpp
//
// Copyright 2008 Eric Niebler. 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)
#ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TYPE_TRAITS_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_STATIC_TYPE_TRAITS_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <string>
#include <boost/config.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/iterator/iterator_traits.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
namespace boost { namespace xpressive { namespace detail
{
///////////////////////////////////////////////////////////////////////////////
// is_static_xpression
//
template<typename T>
struct is_static_xpression
: mpl::false_
{
};
template<typename Matcher, typename Next>
struct is_static_xpression<static_xpression<Matcher, Next> >
: mpl::true_
{
};
template<typename Top, typename Next>
struct is_static_xpression<stacked_xpression<Top, Next> >
: mpl::true_
{
};
//////////////////////////////////////////////////////////////////////////
// is_random
//
template<typename BidiIter>
struct is_random
: is_convertible
<
typename iterator_category<BidiIter>::type
, std::random_access_iterator_tag
>
{
};
//////////////////////////////////////////////////////////////////////////
// is_string_iterator
//
template<typename Iter>
struct is_string_iterator
: mpl::false_
{
};
template<>
struct is_string_iterator<std::string::iterator>
: mpl::true_
{
};
template<>
struct is_string_iterator<std::string::const_iterator>
: mpl::true_
{
};
#ifndef BOOST_NO_STD_WSTRING
template<>
struct is_string_iterator<std::wstring::iterator>
: mpl::true_
{
};
template<>
struct is_string_iterator<std::wstring::const_iterator>
: mpl::true_
{
};
#endif
///////////////////////////////////////////////////////////////////////////////
// is_char
//
template<typename T>
struct is_char
: mpl::false_
{};
template<>
struct is_char<char>
: mpl::true_
{};
template<>
struct is_char<wchar_t>
: mpl::true_
{};
}}} // namespace boost::xpressive::detail
#endif
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