/usr/include/asio/ip/resolver_query_base.hpp is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// resolver_query_base.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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_IP_RESOLVER_QUERY_BASE_HPP
#define ASIO_IP_RESOLVER_QUERY_BASE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include "asio/detail/pop_options.hpp"
#include "asio/detail/socket_types.hpp"
namespace asio {
namespace ip {
/// The resolver_query_base class is used as a base for the
/// basic_resolver_query class templates to provide a common place to define
/// the flag constants.
class resolver_query_base
{
public:
#if defined(GENERATING_DOCUMENTATION)
/// Determine the canonical name of the host specified in the query.
static const int canonical_name = implementation_defined;
/// Indicate that returned endpoint is intended for use as a locally bound
/// socket endpoint.
static const int passive = implementation_defined;
/// Host name should be treated as a numeric string defining an IPv4 or IPv6
/// address and no name resolution should be attempted.
static const int numeric_host = implementation_defined;
/// Service name should be treated as a numeric string defining a port number
/// and no name resolution should be attempted.
static const int numeric_service = implementation_defined;
/// If the query protocol family is specified as IPv6, return IPv4-mapped
/// IPv6 addresses on finding no IPv6 addresses.
static const int v4_mapped = implementation_defined;
/// If used with v4_mapped, return all matching IPv6 and IPv4 addresses.
static const int all_matching = implementation_defined;
/// Only return IPv4 addresses if a non-loopback IPv4 address is configured
/// for the system. Only return IPv6 addresses if a non-loopback IPv6 address
/// is configured for the system.
static const int address_configured = implementation_defined;
#else
BOOST_STATIC_CONSTANT(int, canonical_name = AI_CANONNAME);
BOOST_STATIC_CONSTANT(int, passive = AI_PASSIVE);
BOOST_STATIC_CONSTANT(int, numeric_host = AI_NUMERICHOST);
# if defined(AI_NUMERICSERV)
BOOST_STATIC_CONSTANT(int, numeric_service = AI_NUMERICSERV);
# else
BOOST_STATIC_CONSTANT(int, numeric_service = 0);
# endif
// Note: QNX Neutrino 6.3 defines AI_V4MAPPED, AI_ALL and AI_ADDRCONFIG but
// does not implement them. Therefore they are specifically excluded here.
# if defined(AI_V4MAPPED) && !defined(__QNXNTO__)
BOOST_STATIC_CONSTANT(int, v4_mapped = AI_V4MAPPED);
# else
BOOST_STATIC_CONSTANT(int, v4_mapped = 0);
# endif
# if defined(AI_ALL) && !defined(__QNXNTO__)
BOOST_STATIC_CONSTANT(int, all_matching = AI_ALL);
# else
BOOST_STATIC_CONSTANT(int, all_matching = 0);
# endif
# if defined(AI_ADDRCONFIG) && !defined(__QNXNTO__)
BOOST_STATIC_CONSTANT(int, address_configured = AI_ADDRCONFIG);
# else
BOOST_STATIC_CONSTANT(int, address_configured = 0);
# endif
#endif
protected:
/// Protected destructor to prevent deletion through this type.
~resolver_query_base()
{
}
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
private:
// Workaround to enable the empty base optimisation with Borland C++.
char dummy_;
#endif
};
} // namespace ip
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IP_RESOLVER_QUERY_BASE_HPP
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