Last modified on 13 February 2009, at 19:22

C++ Programming/Code/Standard C Library/Functions/qsort

qsortEdit

Syntax
#include <cstdlib>
void* qsort( const void *base, size_t num, size_t size, int (*compare)(const void *, const void *));

The function qsort() performs a Quick sort on an array. Note that some implementations may instead use a more efficient sorting algorithm.

*base refers to the array being sorted. This array contains num elements, each of size size.

The compare function accepts two pointers to the object within the array - which need to first be cast to the object type being examined. The function returns -1 if the first parameter should be before the second, 1 if the first parameter is after, or 0 if the object matches.

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