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// Networking implementation details -*- C++ -*-
// Copyright (C) 2015-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file experimental/bits/net.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{experimental/net}
*/
#ifndef _GLIBCXX_EXPERIMENTAL_NET_H
#define _GLIBCXX_EXPERIMENTAL_NET_H 1
#pragma GCC system_header
#if __cplusplus >= 201402L
#include <type_traits>
#include <system_error>
#include <experimental/netfwd>
#if __cplusplus > 201703L
# include <concepts>
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace experimental
{
namespace net
{
inline namespace v1
{
/** @addtogroup networking-ts
* @{
*/
template<typename _CompletionToken, typename _Signature, typename>
class async_result;
/// @cond undocumented
// A type denoted by DEDUCED in the TS.
template<typename _CompletionToken, typename _Signature>
using __deduced_t = typename
async_result<decay_t<_CompletionToken>, _Signature, void>::return_type;
// Trait to check for construction from const/non-const lvalue/rvalue.
template<typename _Tp>
using __is_value_constructible = typename __and_<
is_copy_constructible<_Tp>, is_move_constructible<_Tp>,
is_constructible<_Tp, _Tp&>, is_constructible<_Tp, const _Tp&&>
>::type;
struct __throw_on_error
{
explicit
__throw_on_error(const char* __msg) : _M_msg(__msg) { }
~__throw_on_error() noexcept(false)
{
if (_M_ec)
_GLIBCXX_THROW_OR_ABORT(system_error(_M_ec, _M_msg));
}
__throw_on_error(const __throw_on_error&) = delete;
__throw_on_error& operator=(const __throw_on_error&) = delete;
operator error_code&() noexcept { return _M_ec; }
const char* _M_msg;
error_code _M_ec;
};
/// @endcond
// Base class for types meeting both GettableSocketOption and
// SettableSocketOption requirements.
// The bool parameter allows __sockopt_base<bool> to have a
// __sockopt_base<int, B> base class (so that its _M_value is an int)
// but to have that be a distinct type from __sockopt_base<int>.
template<typename _Tp, bool = true>
struct __sockopt_base
{
__sockopt_base() = default;
explicit
__sockopt_base(_Tp __val) noexcept(noexcept(_Tp(std::declval<_Tp&>())))
: _M_value(__val)
{ }
template<typename _Protocol>
void*
data(const _Protocol&) noexcept
{ return std::addressof(_M_value); }
template<typename _Protocol>
const void*
data(const _Protocol&) const noexcept
{ return std::addressof(_M_value); }
template<typename _Protocol>
size_t
size(const _Protocol&) const noexcept
{ return sizeof(_M_value); }
template<typename _Protocol>
void
resize(const _Protocol&, size_t __s)
{
if (__s != sizeof(_M_value))
__throw_length_error("invalid value for socket option resize");
}
protected:
_Tp _M_value { };
};
// Base class for types meeting BooleanSocketOption requirements.
template<>
struct __sockopt_base<bool> : __sockopt_base<int, false>
{
__sockopt_base() = default;
explicit
__sockopt_base(bool __val) noexcept
: __sockopt_base<int, false>(__val)
{ }
bool value() const noexcept { return this->_M_value; }
explicit operator bool() const noexcept { return value(); }
bool operator!() const noexcept { return !value(); }
};
// Base class for types meeting IntegerSocketOption requirements.
template<>
struct __sockopt_base<int> : __sockopt_base<int, false>
{
using __sockopt_base<int, false>::__sockopt_base;
int value() const noexcept { return this->_M_value; }
};
template<typename _Derived, typename _Tp = int>
struct __sockopt_crtp : __sockopt_base<_Tp>
{
using __sockopt_base<_Tp>::__sockopt_base;
_Derived&
operator=(_Tp __value) noexcept(noexcept(__value = __value))
{
__sockopt_base<_Tp>::_M_value = __value;
return static_cast<_Derived&>(*this);
}
template<typename _Protocol>
int
level(const _Protocol&) const noexcept
{ return _Derived::_S_level; }
template<typename _Protocol>
int
name(const _Protocol&) const noexcept
{ return _Derived::_S_name; }
};
namespace __detail
{
#if __cpp_lib_concepts
template<typename _Tp>
concept __protocol_like
= copyable<_Tp> && requires { typename _Tp::endpoint; };
// Endpoint requirements for non-extensible implementations.
template<typename _Tp>
concept __endpoint_base = semiregular<_Tp>
&& requires { typename _Tp::protocol_type; }
&& __protocol_like<typename _Tp::protocol_type>
&& requires(const _Tp __a) {
{ __a.protocol() } -> same_as<typename _Tp::protocol_type>;
};
// Endpoint requirements for extensible implementations.
template<typename _Tp>
concept __endpoint = __endpoint_base<_Tp>
&& requires (const _Tp& __a, _Tp& __b, size_t __s)
{
{ __a.data() } -> same_as<const void*>;
{ __b.data() } -> same_as<void*>;
{ __b.size() } -> same_as<size_t>;
__b.resize(__s);
{ __a.capacity() } -> same_as<size_t>;
};
// Protocol requirements for non-extensible implementations.
template<typename _Tp>
concept __protocol_base = __protocol_like<_Tp>
&& __endpoint_base<typename _Tp::endpoint>
&& same_as<typename _Tp::endpoint::protocol_type, _Tp>;
// Protocol requirements for extensible implementations.
template<typename _Tp>
concept __protocol = __protocol_base<_Tp>
&& __endpoint<typename _Tp::endpoint>
&& requires (const _Tp __a) {
{ __a.family() } -> same_as<int>;
{ __a.type() } -> same_as<int>;
{ __a.protocol() } -> same_as<int>;
};
template<typename _Tp>
concept __acceptable_protocol = __protocol<_Tp>
&& requires { typename _Tp::socket; }
&& move_constructible<typename _Tp::socket>
&& derived_from<typename _Tp::socket, basic_socket<_Tp>>;
template<typename _Tp>
concept __inet_protocol = __acceptable_protocol<_Tp>
&& equality_comparable<_Tp> && requires {
{ _Tp::v4() } -> same_as<_Tp>;
{ _Tp::v6() } -> same_as<_Tp>;
typename _Tp::resolver;
}
&& same_as<typename _Tp::resolver, ip::basic_resolver<_Tp>>;
#else
// Check Endpoint requirements for extensible implementations
template<typename _Tp, typename = void>
struct __is_endpoint : false_type
{ };
template<typename _Tp>
auto
__endpoint_reqs(const _Tp* __a = nullptr, _Tp* __b = nullptr)
-> enable_if_t<__and_<
is_default_constructible<_Tp>, __is_value_constructible<_Tp>,
is_same<decltype(__a->protocol()), typename _Tp::protocol_type>,
is_same<decltype(__a->data()), const void*>,
is_same<decltype(__b->data()), void*>,
is_same<decltype(__a->size()), size_t>,
is_same<decltype(__a->capacity()), size_t>
>::value,
__void_t< typename _Tp::protocol_type::endpoint,
decltype(__b->resize(std::declval<size_t>())) >>;
template<typename _Tp>
struct __is_endpoint<_Tp, decltype(__detail::__endpoint_reqs<_Tp>())>
: true_type
{ };
// Check Protocol requirements for extensible implementations.
template<typename _Tp, typename = void>
struct __is_protocol
: false_type { };
template<typename _Tp>
auto
__protocol_reqs(const _Tp* __a = nullptr)
-> enable_if_t<__and_<
is_copy_constructible<_Tp>, is_copy_assignable<_Tp>,
__is_endpoint<typename _Tp::endpoint>,
is_same<decltype(__a->family()), int>,
is_same<decltype(__a->type()), int>,
is_same<decltype(__a->protocol()), int>
>::value>;
template<typename _Tp>
struct __is_protocol<_Tp, decltype(__detail::__protocol_reqs<_Tp>())>
: true_type
{ };
// Check AcceptableProtocol requirements
template<typename _Tp, typename = void>
struct __is_acceptable_protocol
: false_type { };
template<typename _Tp>
struct __is_acceptable_protocol<_Tp, __void_t<typename _Tp::socket>>
: __and_<__is_protocol<_Tp>, is_move_constructible<typename _Tp::socket>,
is_convertible<typename _Tp::socket*, basic_socket<_Tp>*>>::type
{ };
// Check InternetProtocol requirements
template<typename _Tp, typename = void>
struct __is_inet_protocol
: false_type { };
template<typename _Tp>
auto
__inet_proto_reqs(const _Tp* __a = nullptr)
-> enable_if_t<__and_<
__is_acceptable_protocol<_Tp>,
is_same<typename _Tp::resolver, ip::basic_resolver<_Tp>>,
is_same<decltype(_Tp::v4()), _Tp>,
is_same<decltype(_Tp::v6()), _Tp>,
is_convertible<decltype(*__a == *__a), bool>,
is_convertible<decltype(*__a != *__a), bool>
>::value>;
template<typename _Tp>
struct __is_inet_protocol<_Tp, decltype(__inet_proto_reqs<_Tp>())>
: true_type { };
// Variable templates for requirements (with same names as concepts above).
template<typename _Tp>
constexpr bool __endpoint = __is_endpoint<_Tp>::value;
template<typename _Tp>
constexpr bool __protocol = __is_protocol<_Tp>::value;
template<typename _Tp>
constexpr bool __acceptable_protocol = __is_acceptable_protocol<_Tp>::value;
#endif
} // namespace __detail
/// @}
} // namespace v1
} // namespace net
} // namespace experimental
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++14
#endif // _GLIBCXX_EXPERIMENTAL_NET_H
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