net.h
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// Networking implementation details -*- C++ -*-
// Copyright (C) 2015-2019 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/networking}
*/
#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>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace experimental
{
namespace net
{
inline namespace v1
{
/**
* @ingroup networking
* @{
*/
template<typename _CompletionToken, typename _Signature, typename>
class async_result;
// 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;
};
// Base class for types meeting IntegerSocketOption requirements.
template<typename _Tp>
struct __sockopt_base
{
__sockopt_base() = default;
explicit __sockopt_base(int __val) : _M_value(__val) { }
int value() const noexcept { return _M_value; }
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>
{
__sockopt_base() = default;
explicit __sockopt_base(bool __val) : __sockopt_base<int>(__val) { }
bool value() const noexcept { return __sockopt_base<int>::_M_value; }
explicit operator bool() const noexcept { return value(); }
bool operator!() const noexcept { return !value(); }
};
template<typename _Derived, typename _Tp = int>
struct __sockopt_crtp : __sockopt_base<_Tp>
{
using __sockopt_base<_Tp>::__sockopt_base;
_Derived&
operator=(_Tp __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 v1
} // namespace net
} // namespace experimental
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++14
#endif // _GLIBCXX_EXPERIMENTAL_NET_H
std::addressof
_GLIBCXX17_CONSTEXPR _Tp * addressof(_Tp &__r) noexcept
Returns the actual address of the object or function referenced by r, even in the presence of an over...
Definition: move.h:138
std
ISO C++ entities toplevel namespace is std.
system_error
type_traits