std::qsort — cppreference.com

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Déclaré dans l'en-tête `<cstdlib>`
`void qsort( const void ptr, size_t count, size_t size, int (comp)(const void , const void ) );`

Trie le tableau donné pointé par ptr dans l'ordre croissant. Le tableau contient des éléments count de size taille. Fonction pointée par comp est utilisé pour la comparaison d'objets .

Original:

Sorts the given array pointed to by ptr in ascending order. The array contains count elements of size size. Function pointed to by comp is used for object comparison.

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Paramètres

ptr	-	pointeur vers le tableau à trier Original: pointer to the array to sort The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	nombre d'éléments dans le tableau Original: number of element in the array The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
size	-	taille de chaque élément dans le tableau en octets Original: size of each element in the array in bytes 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 a negative integer value if the first argument is less than the second, a positive integer value if the first argument is greater than the second and zero if the arguments are equal. The signature of the comparison function should be equivalent to the following: `int cmp(const void a, const void b);` The function must not modify the objects passed to it.

Retourne la valeur

(Aucun)

Original:

(none)

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Notes

Le type des éléments du tableau doit être un type trivial, sinon le comportement est indéfini .

Original:

The type of the elements of the array must be a trivial type, otherwise the behavior is undefined.

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Exemple

Le code suivant trie un tableau d'entiers en utilisant qsort() .

Original:

The following code sorts an array of integers using qsort().

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#include <iostream>
#include <cstdlib>
 
int compare_ints(const void* a, const void* b)   // comparison function
{
    int* arg1 = (int*) a;
    int* arg2 = (int*) b;
    if (*arg1 < *arg2) return -1;
    else if (*arg1 == *arg2) return 0;
    else return 1;
}
 
int main()
{
    int a[] = { -2, 99, 0, -743, 2, 3, 4 };
    int size = 7;
 
    std::qsort(a, size, sizeof(int), compare_ints);
 
    for (int i = 0; i < size; i++) {
        std::cout << a[i] << " ";
    }
    std::cout << '\n';
}

Résultat :

Voir aussi


bsearch	recherche un tableau pour un élément de type non spécifié Original: searches an array for an element of unspecified type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

sort	trie une plage dans l'ordre ascendant Original: sorts a range into ascending order The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) [edit]

is_trivial (C++11)	vérifie si un type est trivial Original: checks if a type is trivial The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe générique) [edit]

C documentation for qsort