namespace
{
- struct io_error_category : std::error_category
+ struct io_error_category final : std::error_category
{
- virtual const char*
- name() const noexcept
+ const char*
+ name() const noexcept final
{ return "iostream"; }
_GLIBCXX_DEFAULT_ABI_TAG
- virtual std::string message(int __ec) const
+ std::string
+ message(int __ec) const final
{
std::string __msg;
switch (std::io_errc(__ec))
}
};
- const io_error_category&
- __io_category_instance() noexcept
+ struct constant_init
{
- static const io_error_category __ec{};
- return __ec;
- }
+ 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)
const error_category&
iostream_category() noexcept
- { return __io_category_instance(); }
+ { return io_category_instance.cat; }
ios_base::failure::failure(const string& __str)
: system_error(io_errc::stream, __str) { }
namespace
{
- struct future_error_category : public std::error_category
+ struct future_error_category final : public std::error_category
{
- virtual const char*
- name() const noexcept
+ const char*
+ name() const noexcept final
{ return "future"; }
_GLIBCXX_DEFAULT_ABI_TAG
- virtual std::string message(int __ec) const
+ std::string
+ message(int __ec) const final
{
std::string __msg;
switch (std::future_errc(__ec))
}
};
- const future_error_category&
- __future_category_instance() noexcept
+ struct constant_init
{
- static const future_error_category __fec{};
- return __fec;
- }
+ union {
+ unsigned char unused;
+ future_error_category cat;
+ };
+ constexpr constant_init() : cat() { }
+ ~constant_init() { /* do nothing, union member is not destroyed */ }
+ };
+
+ __constinit constant_init future_category_instance{};
}
namespace std _GLIBCXX_VISIBILITY(default)
{ _GLIBCXX_THROW_OR_ABORT(future_error(make_error_code(future_errc(__i)))); }
const error_category& future_category() noexcept
- { return __future_category_instance(); }
+ { return future_category_instance.cat; }
future_error::~future_error() noexcept { }