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    std::is_heap

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    <metanoindex/>

     
    C++
     
    Bibliothque d'algorithmes
    Fonctions
    Original:
    Functions
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    Non-modification de la squence des oprations
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    Non-modifying sequence operations
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    Modification de la squence des oprations
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    Modifying sequence operations
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    Des oprations de partitionnement
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    Partitioning operations
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    Oprations de tri (sur les gammes tris)
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    Sorting operations (on sorted ranges)
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    is_sorted (C++11)
    is_sorted_until (C++11)
    sort
    Oprations binaires de recherche (sur les gammes tris)
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    Binary search operations (on sorted ranges)
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    Dfinir les oprations (sur les gammes tris)
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    Set operations (on sorted ranges)
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    Oprations Heap
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    Heap operations
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    Minimum / maximum de fonctionnement
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    Minimum/maximum operations
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    Oprations numriques
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    Numeric operations
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    Bibliothque C
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    C library
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    <tbody> </tbody>
    Dclar dans l'en-tte <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)
    Vrifie si les lments 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 premire version de is_heap utilise operator< de comparer des lments, tandis que la seconde utilise la fonction de comparaison donne 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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    Paramtres

    first, last -
    l'ventail des lments 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.

    Retourne la valeur

    true si la plage est tas', false autrement .
    Original:
    true if the range is heap, false otherwise.
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    Complexit

    Linaire de la distance entre first et last
    Original:
    Linear in the distance between first and last
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    Notes

    Un tas' est un ensemble d'lments [f,l) qui a les proprits 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 lment de la srie
      Original:
      *f is the largest element in the range
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    • un nouvel lment peut tre ajout l'aide std::push_heap()
      Original:
      a new element can be added using std::push_heap()
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    • le premier lment peut tre retir l'aide std::pop_heap()
      Original:
      the first element can be removed using std::pop_heap()
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    La disposition relle des lments est dfini par l'implmentation .
    Original:
    The actual arrangement of the elements is implementation defined.
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    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';
}

    Rsultat : 

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

    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 gnrique) [edit]
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