27 Algorithms library [algorithms]

27.8 Sorting and related operations [alg.sorting]

27.8.8 Heap operations [alg.heap.operations]

27.8.8.2push_heap[push.heap]

```template<class RandomAccessIterator> constexpr void push_heap(RandomAccessIterator first, RandomAccessIterator last); template<class RandomAccessIterator, class Compare> constexpr void push_heap(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::push_heap(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::push_heap(R&& r, Comp comp = {}, Proj proj = {}); ```
Let comp be less{} and proj be identity{} for the overloads with no parameters by those names.
Preconditions: The range [first, last - 1) is a valid heap with respect to comp and proj.
For the overloads in namespace std, RandomAccessIterator meets the Cpp17ValueSwappable requirements ([swappable.requirements]) and the type of *first meets the Cpp17MoveConstructible requirements (Table 31) and the Cpp17MoveAssignable requirements (Table 33).
Effects: Places the value in the location last - 1 into the resulting heap [first, last).
Returns: last for the overloads in namespace ranges.
Complexity: At most comparisons and twice as many projections.