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std::qsort

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qsort
 
Definido en la cabecera <cstdlib>
void qsort( const void *ptr, size_t count, size_t size,
            int (*comp)(const void *, const void *) );
Ordena el array dado que apunta ptr en orden ascendente. La matriz contiene elementos count de size tamaño. Función a la que apunta comp se utiliza para la comparación de objetos .
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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Contenido

[editar] Parámetros

ptr -
puntero a la matriz a ordenar
Original:
pointer to the array to sort
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count -
número de elemento de la matriz
Original:
number of element in the array
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size -
tamaño de cada elemento de la matriz en bytes
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.

[editar] Valor de retorno

(Ninguno)
Original:
(none)
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[editar] Notas

El tipo de los elementos de la matriz debe ser de un tipo trivial', de lo contrario el comportamiento es indefinido .
Original:
The type of the elements of the array must be a trivial type, otherwise the behavior is undefined.
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[editar] Ejemplo

El código siguiente, una matriz de enteros utilizando 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';
}

Salida:

-743 -2 0 2 3 4 99

[editar] Ver también

busca en una matriz de un elemento de tipo no especificado
Original:
searches an array for an element of unspecified type
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(función) [editar]
Ordena un intervalo en orden ascendente
Original:
sorts a range into ascending order
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(plantilla de función) [editar]
Comprueba si un tipo es trivial
Original:
checks if a type is trivial
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(plantilla de clase) [editar]
C documentation for qsort