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 ErrorConditionEnum>
  error_condition& operator=(ErrorConditionEnum e) noexcept;

Constraints: is_error_condition_enum_v<ErrorConditionEnum> is true.

Postconditions: *this == make_error_condition(e).

Returns: *this.

void clear() noexcept;

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