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std::is_heap

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< cpp‎ | algorithm

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C++
 
Bibliothèque d'algorithmes
Fonctions
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Functions
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Non-modification de la séquence des opérations
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Non-modifying sequence operations
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Modification de la séquence des opérations
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Modifying sequence operations
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Des opérations de partitionnement
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Partitioning operations
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Opérations de tri (sur les gammes triés)
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Sorting operations (on sorted ranges)
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is_sorted (C++11)
is_sorted_until (C++11)
sort
Opérations binaires de recherche (sur les gammes triés)
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Binary search operations (on sorted ranges)
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Définir les opérations (sur les gammes triés)
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Set operations (on sorted ranges)
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Opérations Heap
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Heap operations
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is_heap
is_heap_until (C++11)
make_heap
Minimum / maximum de fonctionnement
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Minimum/maximum operations
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Opérations numériques
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Numeric operations
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Bibliothèque C
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C library
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Déclaré dans l'en-tête <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)
Vérifie si les éléments de la gamme sont [first, last) un tas' .
Original:
Checks if the elements in range [first, last) are a heap.
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La première version de is_heap utilise operator< de comparer des éléments, tandis que la seconde utilise la fonction de comparaison donnée 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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Sommaire

[modifier] Paramètres

first, last -
l'éventail des éléments à examiner
Original:
the range of elements to examine
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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.

[modifier] Retourne la valeur

true si la plage est tas', false autrement .
Original:
true if the range is heap, false otherwise.
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[modifier] Complexité

Linéaire de la distance entre first et last
Original:
Linear in the distance between first and last
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[modifier] Notes

Un tas' est un ensemble d'éléments [f,l) qui a les propriétés suivantes:
Original:
A heap is a range of elements [f,l) that has the following properties:
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  • *f est le plus grand élément de la série
    Original:
    *f is the largest element in the range
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  • un nouvel élément peut être ajouté à l'aide std::push_heap()
    Original:
    a new element can be added using std::push_heap()
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  • le premier élément peut être retiré à l'aide std::pop_heap()
    Original:
    the first element can be removed using std::pop_heap()
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La disposition réelle des éléments est défini par l'implémentation .
Original:
The actual arrangement of the elements is implementation defined.
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[modifier] Exemple

#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';
}

Résultat : 

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

[modifier] Voir aussi

(C++11)
trouve le plus grand sous-plage qui est tas
Original:
finds the largest subrange that is heap
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(fonction générique) [edit]
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/algorithm/is_heap&oldid=47511 »