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std::qsort

Da cppreference.com.
< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
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Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
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Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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C library
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qsort
 
Defined in header <cstdlib>
void qsort( const void *ptr, size_t count, size_t size,
            int (*comp)(const void *, const void *) );
Ordina l'array dato puntato da ptr in ordine crescente. La matrice contiene elementi count di size dimensioni. Funzione puntato da comp viene utilizzato per confronto oggetto.
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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Indice

[modifica] Parametri

ptr -
puntatore alla matrice da ordinare
Original:
pointer to the array to sort
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count -
numero di elemento della matrice
Original:
number of element in the array
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size -
dimensione di ciascun elemento della matrice in byte
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.
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.

[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Note

Tipo degli elementi della matrice deve essere un banale tipo, altrimenti il ​​comportamento è indefinito.
Original:
The type of the elements of the array must be a trivial type, otherwise the behavior is undefined.
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[modifica] Esempio

Il codice seguente ordina un array di numeri interi che utilizzano 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';
}

Output:

-743 -2 0 2 3 4 99

[modifica] Vedi anche

cerca una matrice per un elemento di tipo non specificato
Original:
searches an array for an element of unspecified type
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(funzione) [edit]
ordina una serie in ordine crescente
Original:
sorts a range into ascending order
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(funzione di modello) [edit]
Verifica se un tipo è banale
Original:
checks if a type is trivial
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(classe template) [edit]
C documentation for qsort