std::is_heap - cppreference.com

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Elemento definito nell'header `<algorithm>`

`template< class RandomIt > bool is_heap( RandomIt first, RandomIt last );`	(1)

`template< class RandomIt, class Compare > bool is_heap( RandomIt first, RandomIt last, Compare comp );`	(2)

Controlla se gli elementi nella gamma di [first, last) sono un mucchio'.

Original:

Checks if the elements in range [first, last) are a heap.

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La prima versione di is_heap operator< utilizza per confrontare gli elementi, mentre il secondo utilizza la funzione di confronto dato comp.

Original:

The first version of is_heap uses operator< to compare elements, whereas the second uses the given comparison function comp.

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Parametri

first, last	-	la gamma di elementi da esaminare Original: the range of elements to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 `RandomIt` can be dereferenced and then implicitly converted to both of them.
Type requirements
-`RandomIt` must meet the requirements of `RandomAccessIterator`.

Valore di ritorno

true se l'intervallo è heap', false altrimenti.

Original:

true if the range is heap, false otherwise.

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Complessità

Lineare della distanza tra first e last

Original:

Linear in the distance between first and last

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Note

Un mucchio' è una serie di elementi [f,l) che ha le seguenti proprietà:

Original:

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

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*f è l'elemento più grande della gamma
Original:
*f is the largest element in the range
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un nuovo elemento può essere aggiunto utilizzando std::push_heap()
Original:
a new element can be added using std::push_heap()
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il primo elemento può essere rimosso utilizzando std::pop_heap()
Original:
the first element can be removed using std::pop_heap()
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L'effettiva disposizione degli elementi è definita attuazione.

Original:

The actual arrangement of the elements is implementation defined.

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Esempio

#include <iostream>
#include <algorithm>

int main()
{
    std::vector<int> v { 3, 1, 4, 1, 5, 9 };

    std::cout << "initially, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';

    if (!std::is_heap(v.begin(), v.end())) {
        std::cout << "making heap...\n";
        std::make_heap(v.begin(), v.end());
    }

    std::cout << "after make_heap, v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
}

Output:

initially, v: 3 1 4 1 5 9 
making heap...
after make_heap, v: 9 5 4 1 1 3

Vedi anche


	trova il più grande sottointervallo che è heap Original: finds the largest subrange that is heap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello) [modifica]