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//
// ip/resolver_base.hpp
// ~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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_BASE_HPP
#define ASIO_IP_RESOLVER_BASE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/socket_types.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ip {
/// The resolver_base class is used as a base for the basic_resolver class
/// templates to provide a common place to define the flag constants.
class resolver_base
{
public:
#if defined(GENERATING_DOCUMENTATION)
/// A bitmask type (C++ Std [lib.bitmask.types]).
typedef unspecified flags;
/// Determine the canonical name of the host specified in the query.
static const flags canonical_name = implementation_defined;
/// Indicate that returned endpoint is intended for use as a locally bound
/// socket endpoint.
static const flags 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 flags 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 flags 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 flags v4_mapped = implementation_defined;
/// If used with v4_mapped, return all matching IPv6 and IPv4 addresses.
static const flags 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 flags address_configured = implementation_defined;
#else
enum flags
{
canonical_name = ASIO_OS_DEF(AI_CANONNAME),
passive = ASIO_OS_DEF(AI_PASSIVE),
numeric_host = ASIO_OS_DEF(AI_NUMERICHOST),
numeric_service = ASIO_OS_DEF(AI_NUMERICSERV),
v4_mapped = ASIO_OS_DEF(AI_V4MAPPED),
all_matching = ASIO_OS_DEF(AI_ALL),
address_configured = ASIO_OS_DEF(AI_ADDRCONFIG)
};
// Implement bitmask operations as shown in C++ Std [lib.bitmask.types].
friend flags operator&(flags x, flags y)
{
return static_cast<flags>(
static_cast<unsigned int>(x) & static_cast<unsigned int>(y));
}
friend flags operator|(flags x, flags y)
{
return static_cast<flags>(
static_cast<unsigned int>(x) | static_cast<unsigned int>(y));
}
friend flags operator^(flags x, flags y)
{
return static_cast<flags>(
static_cast<unsigned int>(x) ^ static_cast<unsigned int>(y));
}
friend flags operator~(flags x)
{
return static_cast<flags>(~static_cast<unsigned int>(x));
}
friend flags& operator&=(flags& x, flags y)
{
x = x & y;
return x;
}
friend flags& operator|=(flags& x, flags y)
{
x = x | y;
return x;
}
friend flags& operator^=(flags& x, flags y)
{
x = x ^ y;
return x;
}
#endif
protected:
/// Protected destructor to prevent deletion through this type.
~resolver_base()
{
}
};
} // namespace ip
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IP_RESOLVER_BASE_HPP
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