Typedef Function Pointer

http://phorum.study-area.org/index.php?topic=21728.0
http://squall.cs.ntou.edu.tw/cpp/94spring/lab03/Lab3-2.html
http://www.programmer-club.com.tw/ShowSameTitleN/c/25059.html
http://caterpillar.onlyfun.net/Gossip/CGossip/FunctionPointer.html