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Checks if a range is a heap or not
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Key Facts

Gyroscopic Couple: The rate of change of angular momentum (\tau) = I\omega\Omega (In the limit).
  • I = Moment of Inertia.
  • \omega = Angular velocity
  • \Omega = Angular velocity of precession.

Blaise Pascal (1623-1662) was a French mathematician, physicist, inventor, writer and Catholic philosopher.

Leonhard Euler (1707-1783) was a pioneering Swiss mathematician and physicist.


The is_heap() algorithm is defined in the standard header <algorithm> and in the nonstandard backward-compatibility header <algo.h>.


#include <algorithm>
template < class RandomAccessIterator >
    bool is_heap(
        RandomAccessIterator first,
        RandomAccessIterator last
template < class RandomAccessIterator, class BinaryPredicate >
    bool is_heap(
        RandomAccessIterator first,
        RandomAccessIterator last,
        BinaryPredicate comp

Parameter Description
first A random access iterator that indicates the start of a range to check for a heap
last A random access iterator that indicates the end of a range
comp A condition to test to order elements. A binary predicate takes a single argument and returns true or false


Is_heap function checks if the elements in range [first, last) form a heap.

The first version compares objects using operator< and the second compares objects using a function object comp.

Return Value

Returns true if the elements in the specified range form a heap, otherwise false.


The complexity is linear; performs at most (last - first) - 1 comparisons.