std::is_heap

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Defined in header <algorithm>
template< class RandomAccessIterator > bool is_heap( RandomAccessIterator first, RandomAccessIterator last );	(1)
template< class RandomAccessIterator, class Compare > bool is_heap( RandomAccessIterator first, RandomAccessIterator last, Compare comp );	(2)

Checks if the elements in range [first, last) is a heap. 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 Notes 5 Example 6 See also

[edit] Parameters

first, last	-	the range of elements to examine
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. ​

[edit] Return value

true if the range is heap, false otherwise.

[edit] Complexity

linear in the distance between first and last

[edit] 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 std::push_heap()
• the first element can be removed using std::pop_heap()

The actual arrangement of the elements is implementation defined.

[edit] Example

This section is incomplete

[edit] See also

is_heap_until (C++11)	finds the largest subrange that is heap (function template)