05-22-2010, 05:39 PM
From help:
The callback function must compare a and b, and return:
-1 if a must be placed before b;
1 if a must be placed after b;
0 if there is no difference.
The callback function must compare a and b, and return:
-1 if a must be placed before b;
1 if a must be placed after b;
0 if there is no difference.