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std::is_heap_until

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< cpp‎ | algorithm

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C++
 
Bibliothèque d'algorithmes
Fonctions
Original:
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 >
RandomIt is_heap_until( RandomIt first, RandomIt last );
 (1) (depuis C++11)
template< class RandomIt, class Compare >
RandomIt is_heap_until( RandomIt first, RandomIt last, Compare comp );
 (2) (depuis C++11)
Examine la portée et [first, last) trouve le plus grand nombre au début first qui est' tas. La première version de la fonction utilise operator< de comparer les éléments, la seconde utilise la fonction de comparaison donnée comp .
Original:
Examines the range [first, last) and finds the largest range beginning at first which is heap. The first version of the function uses operator< to compare the elements, 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

La limite supérieure de la gamme la plus étendue au début first qui est tas'. Autrement dit, la dernière it itérateur pour quelle gamme est [first, it) tas' .
Original:
The upper bound of the largest range beginning at first which is heap. That is, the last iterator it for which range [first, it) is heap.
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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::make_heap(v.begin(), v.end());
 
    // probably mess up the heap
    v.push_back(2);
    v.push_back(6);
 
    auto heap_end = std::is_heap_until(v.begin(), v.end());
 
    std::cout << "all of v: ";
    for (auto i : v) std::cout << i << ' ';
    std::cout << '\n';
 
    std::cout << "only heap: ";
    for (auto i = v.begin(); i != heap_end; ++i) std::cout << *i << ' ';
    std::cout << '\n';
}

Résultat : 

all of v:  9 5 4 1 1 3 2 6 
only heap: 9 5 4 1 1 3 2

[modifier] Voir aussi

 checks if the given range is a heap
(fonction générique) [edit]
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/algorithm/is_heap_until&oldid=47512 »