template<class ForwardIterator, class T = iterator_traits<ForwardIterator>::value_type>
constexpr void fill(ForwardIterator first, ForwardIterator last, const T& value);
template<class ExecutionPolicy, class ForwardIterator,
class T = iterator_traits<ForwardIterator>::value_type>
void fill(ExecutionPolicy&& exec,
ForwardIterator first, ForwardIterator last, const T& value);
template<class OutputIterator, class Size, class T = iterator_traits<OutputIterator>::value_type>
constexpr OutputIterator fill_n(OutputIterator first, Size n, const T& value);
template<class ExecutionPolicy, class ForwardIterator, class Size,
class T = iterator_traits<ForwardIterator>::value_type>
ForwardIterator fill_n(ExecutionPolicy&& exec,
ForwardIterator first, Size n, const T& value);
template<class O, sentinel_for<O> S, class T = iter_value_t<O>>
requires output_iterator<O, const T&>
constexpr O ranges::fill(O first, S last, const T& value);
template<class R, class T = range_value_t<R>>
requires output_range<R, const T&>>
constexpr borrowed_iterator_t<R> ranges::fill(R&& r, const T& value);
template<class O, class T = iter_value_t<O>>
requires output_iterator<O, const T&>>
constexpr O ranges::fill_n(O first, iter_difference_t<O> n, const T& value);