22 Diagnostics library [diagnostics]

22.5 System error support [syserr]

22.5.3 Class error_­code [syserr.errcode] Class error_­code modifiers [syserr.errcode.modifiers]

void assign(int val, const error_category& cat) noexcept;

Postconditions: val_­ == val and cat_­ == &cat.

template <class ErrorCodeEnum> error_code& operator=(ErrorCodeEnum e) noexcept;

Postconditions: *this == make_­error_­code(e).

Returns: *this.

Remarks: This operator shall not participate in overload resolution unless
is_­error_­code_­enum_­v<ErrorCodeEnum> is true.

void clear() noexcept;

Postconditions: value() == 0 and category() == system_­category().