/usr/include/boost/foreach_fwd.hpp is in libboost1.48-dev 1.48.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// foreach.hpp header file
//
// Copyright 2010 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)
// See http://www.boost.org/libs/foreach for documentation
//
// Credits:
// Kazutoshi Satoda: for suggesting the need for a _fwd header for foreach's
// customization points.
#ifndef BOOST_FOREACH_FWD_HPP
#define BOOST_FOREACH_FWD_HPP
#include <utility> // for std::pair
// This must be at global scope, hence the uglified name
enum boost_foreach_argument_dependent_lookup_hack
{
boost_foreach_argument_dependent_lookup_hack_value
};
namespace boost
{
namespace foreach
{
template<typename T>
std::pair<T, T> in_range(T begin, T end);
///////////////////////////////////////////////////////////////////////////////
// boost::foreach::tag
//
typedef boost_foreach_argument_dependent_lookup_hack tag;
///////////////////////////////////////////////////////////////////////////////
// boost::foreach::is_lightweight_proxy
// Specialize this for user-defined collection types if they are inexpensive to copy.
// This tells BOOST_FOREACH it can avoid the rvalue/lvalue detection stuff.
template<typename T>
struct is_lightweight_proxy;
///////////////////////////////////////////////////////////////////////////////
// boost::foreach::is_noncopyable
// Specialize this for user-defined collection types if they cannot be copied.
// This also tells BOOST_FOREACH to avoid the rvalue/lvalue detection stuff.
template<typename T>
struct is_noncopyable;
} // namespace foreach
// Workaround for unfortunate https://svn.boost.org/trac/boost/ticket/6131
namespace BOOST_FOREACH
{
using foreach::in_range;
using foreach::tag;
template<typename T>
struct is_lightweight_proxy
: foreach::is_lightweight_proxy<T>
{};
template<typename T>
struct is_noncopyable
: foreach::is_noncopyable<T>
{};
} // namespace BOOST_FOREACH
} // namespace boost
#endif
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