/usr/include/asio/detail/function.hpp is in libasio-dev 1:1.10.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// detail/function.hpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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 ASIO_DETAIL_FUNCTION_HPP
#define ASIO_DETAIL_FUNCTION_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_STD_FUNCTION)
# include <functional>
#else // defined(ASIO_HAS_STD_FUNCTION)
# include <boost/function.hpp>
#endif // defined(ASIO_HAS_STD_FUNCTION)
namespace asio {
namespace detail {
#if defined(ASIO_HAS_STD_FUNCTION)
using std::function;
#else // defined(ASIO_HAS_STD_FUNCTION)
using boost::function;
#endif // defined(ASIO_HAS_STD_FUNCTION)
} // namespace detail
} // namespace asio
#endif // ASIO_DETAIL_FUNCTION_HPP
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