19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

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

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

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

Constraints: is_error_code_enum_v<ErrorCodeEnum> is true.

Effects: Equivalent to: error_code ec = make_error_code(e); assign(ec.value(), ec.category());

Returns: *this.

void clear() noexcept;

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