std::make_heap

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Defined in header <algorithm>
​template< class RandomAccessIterator > void make_heap( RandomAccessIterator first, RandomAccessIterator last );​	(1)
​template< class RandomAccessIterator, class Compare > void make_heap( RandomAccessIterator first, RandomAccessIterator last,                 Compare comp );​	(2)

Constructs a heap in the range [first, last). The first version of the function uses ​operator<​ to compare the elements, the second uses the given comparison function comp.

Contents 1 Parameters 2 Return value 3 Complexity 4 Example 5 Notes 6 See also

Parameters

first, last	-	the range of elements to make the heap from
comp	-	comparison function which returns ​​true​ if the first argument is less than the second. The signature of the comparison function should be equivalent to the following: ​bool cmp(const Type1 &a, const Type2 &b);​ The signature does not need to have ​const &​, but the function must not modify the objects passed to it. The types ​Type1​ and ​Type2​ must be such that an object of type ​RandomAccessIterator​ can be dereferenced and then implicitly converted to both of them. ​

Return value

(none)

Complexity

At most ​3*std::distance(first, last)​ comparisons.

Example

This section is incomplete

Notes

A heap is a range of elements [f,l) that has the following properties:

• ​*f​ is the largest element in the range
• a new element can be added using push_heap()
• the first element can be removed using pop_heap()

The actual arrangement of the elements is implementation defined.

See also

sort_heap	turns a heap into a sorted range of elements (function template)