std::bsearch

 

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Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

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Bibliothèque pour les expressions régulières (C++11)

Bibliothèque pour les opérations atomiques (C++11)

Bibliothèque pour les processus légers (threads) (C++11)

 

Bibliothèque d'algorithmes

Fonctions Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
Non-modification de la séquence des opérations Original: Non-modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
Modification de la séquence des opérations Original: Modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
Des opérations de partitionnement Original: Partitioning operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
Opérations de tri (sur les gammes triés) Original: Sorting operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
Opérations binaires de recherche (sur les gammes triés) Original: Binary search operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
lower_bound upper_bound	binary_search equal_range
Définir les opérations (sur les gammes triés) Original: Set operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
merge inplace_merge includes	set_difference set_intersection set_symmetric_difference set_union
Opérations Heap Original: Heap operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
Minimum / maximum de fonctionnement Original: Minimum/maximum operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
max max_element min min_element minmax (C++11) minmax_element (C++11)	lexicographical_compare is_permutation (C++11) next_permutation prev_permutation
Opérations numériques Original: Numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
iota (C++11) accumulate inner_product	adjacent_difference partial_sum
Bibliothèque C Original: C library The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
qsort	bsearch

 

Defined in header <cstdlib>
void* bsearch( const void* key, const void* ptr, size_t count, size_t size,                int (*comp)(const void*, const void*) );

Recherche un élément égal à l'élément pointé par key dans un tableau pointé par ptr. Le tableau contient des éléments count de size taille. Fonction pointée par comp est utilisé pour la comparaison d'objets .

Original:

Finds an element equal to element pointed to by key in an array pointed to by ptr. The array contains count elements of size size. Function pointed to by comp is used for object comparison.

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Paramètres

key	-	pointeur vers l'élément à rechercher Original: pointer to the element to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
ptr	-	pointeur vers le tableau d'examiner Original: pointer to the array to examine The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456
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. maria 123456
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. maria 123456
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. key is passed as the first argument, an element from the array as the second. 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

Pointeur vers l'élément trouvé ou NULL autrement .

Original:

Pointer to the found element or NULL otherwise.

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Exemple

#include <cstdlib>
#include <iostream>
 
int compare(const void *ap, const void *bp)
{
    const int *a = (int *) ap;
    const int *b = (int *) bp;
    return *a - *b;
}
 
int show_ptr(int *p) 
{
    if (p == NULL) {
        std::cout << "NULL\n";
    } else {
        std::cout << p1 << ' ' << *p1 << '\n';
    }
}
 
int main(int argc, char **argv)
{
    const int ARR_SIZE = 8;
    int arr[ARR_SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8 };
 
    int key1 = 4;
    int *p1 = (int *) std::bsearch(&key1, arr, ARR_SIZE, sizeof(arr[0]), compare);
 
    int key2 = 9;
    int *p2 = (int *) std::bsearch(&key2, arr, ARR_SIZE, sizeof(arr[0]), compare);
 
    std::cout << "p1: ";
    show_ptr(p1);
 
    std::cout << "p2: ";
    show_ptr(p2);
}

Résultat :

p1: 0xbf9a4c88 4
p2: NULL

Voir aussi

qsort	Trie une plage d'éléments de type indéterminé Original: sorts a range of elements with unspecified type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456 (fonction)
equal_range	rendements varient d'éléments correspondant à une clé spécifique Original: returns range of elements matching a specific key The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. maria 123456 (fonction générique)
C documentation for bsearch