template<class RandomAccessIterator>
constexpr void stable_sort(RandomAccessIterator first, RandomAccessIterator last);
template<class ExecutionPolicy, class RandomAccessIterator>
void stable_sort(ExecutionPolicy&& exec,
RandomAccessIterator first, RandomAccessIterator last);
template<class RandomAccessIterator, class Compare>
constexpr void stable_sort(RandomAccessIterator first, RandomAccessIterator last,
Compare comp);
template<class ExecutionPolicy, class RandomAccessIterator, class Compare>
void stable_sort(ExecutionPolicy&& exec,
RandomAccessIterator first, RandomAccessIterator last,
Compare comp);
template<random_access_iterator I, sentinel_for<I> S, class Comp = ranges::less,
class Proj = identity>
requires sortable<I, Comp, Proj>
constexpr I ranges::stable_sort(I first, S last, Comp comp = {}, Proj proj = {});
template<random_access_range R, class Comp = ranges::less, class Proj = identity>
requires sortable<iterator_t<R>, Comp, Proj>
constexpr borrowed_iterator_t<R>
ranges::stable_sort(R&& r, Comp comp = {}, Proj proj = {});
template<execution-policy Ep, random_access_iterator I, sized_sentinel_for<I> S,
class Comp = ranges::less, class Proj = identity>
requires sortable<I, Comp, Proj>
I ranges::stable_sort(Ep&& exec, I first, S last, Comp comp = {}, Proj proj = {});
template<execution-policy Ep, sized-random-access-range R, class Comp = ranges::less,
class Proj = identity>
requires sortable<iterator_t<R>, Comp, Proj>
borrowed_iterator_t<R>
ranges::stable_sort(Ep&& exec, R&& r, Comp comp = {}, Proj proj = {});