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std::qsort

Da cppreference.com
< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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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 *) );
Classifica a matriz dado apontado por ptr em ordem crescente. A matriz contém elementos count de size tamanho. Função apontada pelo comp é usado para comparação 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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Índice

[editar] Parâmetros

ptr -
ponteiro para a matriz para classificar
Original:
pointer to the array to sort
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count -
número de elementos na matriz
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number of element in the array
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size -
tamanho de cada elemento na matriz em bytes
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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

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

O tipo dos elementos da matriz deve ser um tipo de' trivial, caso contrário, o comportamento é indefinido.
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The type of the elements of the array must be a trivial type, otherwise the behavior is undefined.
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[editar] Exemplo

Os seguintes tipos de código de um array de inteiros usando qsort() .
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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

[editar] Veja também

procura uma matriz para um elemento de tipo não especificado
Original:
searches an array for an element of unspecified type
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(função) [edit]
tipo um intervalo em ordem crescente
Original:
sorts a range into ascending order
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(modelo de função) [edit]
verifica se um tipo é trivial
Original:
checks if a type is trivial
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(modelo de classe) [edit]
C documentation for qsort