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##### make_heap

###### Prototype

    template<class RandomAccessRange>
    RandomAccessRange& make_heap(RandomAccessRange& rng);

    template<class RandomAccessRange>
    const RandomAccessRange& make_heap(const RandomAccessRange& rng);

    template<class RandomAccessRange, class Compare>
    RandomAccessRange& make_heap(RandomAccessRange& rng, Compare pred);

    template<class RandomAccessRange, class Compare>
    const RandomAccessRange& make_heap(const RandomAccessRange& rng, Compare pred);

###### Description

`make_heap` turns `rng` into a heap.

The ordering relationship is determined by using `operator<` in the non-predicate versions, and by evaluating `pred` in the predicate versions.

###### Definition

Defined in the header file `boost/range/algorithm/heap_algorithm.hpp`

###### Requirements

For the non-predicate versions:

- `RandomAccessRange` is a model of the Random Access Range Concept.
- `RandomAccessRange` is mutable.
- `RandomAccessRange`'s value type is a model of the `LessThanComparableConcept`.
- The ordering of objects of type `RandomAccessRange`'s value type is a strict weak ordering, as defined in the `LessThanComparableConcept` requirements.

For the predicate versions:

- `RandomAccessRange` is a model of the Random Access Range Concept.
- `RandomAccessRange` is mutable.
- `Compare` is a model of the `StrictWeakOrderingConcept`.
- `RandomAccessRange`'s value type is convertible to both of `Compare`'s argument types.

###### Complexity

Linear. At most `3 * distance(rng)` comparisons.