25 Algorithms library [algorithms]

25.8 Sorting and related operations [alg.sorting]

25.8.7 Heap operations [alg.heap.operations]

25.8.7.1 push_­heap [push.heap]

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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 = {});
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Let comp be less{} and proj be identity{} for the overloads with no parameters by those names.
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Preconditions: The range [first, last - 1) is a valid heap with respect to comp and proj.
For the overloads in namespace std, the type of *first meets the Cpp17MoveConstructible requirements (Table 28) and the Cpp17MoveAssignable requirements (Table 30).
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Effects: Places the value in the location last - 1 into the resulting heap [first, last).
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Returns: last for the overloads in namespace ranges.
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Complexity: At most comparisons and twice as many projections.