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// std::iostream_category() definition -*- C++ -*-
// Copyright (C) 2014-2022 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/>.
//
// ISO C++ 14882:2011: 27.5.6.5 Error reporting [error.reporting]
//
#define _GLIBCXX_USE_CXX11_ABI 1
#include <ios>
#if __has_cpp_attribute(clang::require_constant_initialization)
# define __constinit [[clang::require_constant_initialization]]
#endif
namespace
{
struct io_error_category final : std::error_category
{
const char*
name() const noexcept final
{ return "iostream"; }
_GLIBCXX_DEFAULT_ABI_TAG
std::string
message(int __ec) const final
{
std::string __msg;
switch (std::io_errc(__ec))
{
case std::io_errc::stream:
__msg = "iostream error";
break;
default:
__msg = "Unknown error";
break;
}
return __msg;
}
};
struct constant_init
{
union {
unsigned char unused;
io_error_category cat;
};
constexpr constant_init() : cat() { }
~constant_init() { /* do nothing, union member is not destroyed */ }
};
__constinit constant_init io_category_instance{};
} // namespace
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
const error_category&
iostream_category() noexcept
{ return io_category_instance.cat; }
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace