Difference between revisions of "cpp/algorithm/qsort"
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===Example=== | ===Example=== | ||
{{example cpp | {{example cpp | ||
| − | | | + | | The following code sorts an array of integers using {{tt|qsort()}}. |
| code= | | code= | ||
#include <iostream> | #include <iostream> | ||
Revision as of 09:00, 24 August 2011
Template:cpp/algorithm/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
</td>
<cstdlib>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td class="t-dcl-nopad">void qsort( const void *ptr, size_t count, size_t size,
int (*comp)(const void *, const void *) );
</td>
int (*comp)(const void *, const void *) );
<td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end
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.
Contents |
Parameters
| ptr | - | pointer to the array to sort |
| count | - | number of element in the array |
| size | - | size of each element in the array in bytes |
| 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 equivalent. 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 and must return consistent results when called for the same objects, regardless of their positions in the array. |
