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std::bsearch

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< cpp‎ | algorithm

 
 
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
Original:
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)
Original:
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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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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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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Sommaire

[modifier] Paramètres

key -
pointeur vers l'élément à rechercher
Original:
pointer to the element to search for
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ptr -
pointeur vers le tableau d'examiner
Original:
pointer to the array to examine
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count -
nombre d'éléments dans le tableau
Original:
number of element in the array
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size -
taille de chaque élément dans le tableau en octets
Original:
size of each element in the array in bytes
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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.

[modifier] Retourne la valeur

Pointeur vers l'élément trouvé ou NULL autrement .
Original:
Pointer to the found element or NULL otherwise.
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[modifier] 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

[modifier] Voir aussi

Trie une plage d'éléments de type indéterminé
Original:
sorts a range of elements with unspecified type
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(fonction) [edit]
rendements varient d'éléments correspondant à une clé spécifique
Original:
returns range of elements matching a specific key
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(fonction générique) [edit]
C documentation for bsearch