template <RandomAccessIterator I, Sentinel<I> S, class Comp = less<>,
class Proj = identity>
requires Sortable<I, Comp, Proj>
I make_heap(I first, S last, Comp comp = Comp{}, Proj proj = Proj{});
template <RandomAccessRange Rng, class Comp = less<>, class Proj = identity>
requires Sortable<iterator_t<Rng>, Comp, Proj>
safe_iterator_t<Rng>
make_heap(Rng&& rng, Comp comp = Comp{}, Proj proj = Proj{});
Effects: Constructs a heap out of the range [first,last).
Returns: last
Complexity: At most 3 * (last - first) applications of the comparison function and projection.