View Compilation Error

0_0_11489140_12170.cpp: In function `int main()':
0_0_11489140_12170.cpp:26: error: invalid conversion from `int (*)(const A*, const A*)' to `int (*)(const void*, const void*)'
0_0_11489140_12170.cpp:26: error:   initializing argument 4 of `void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'