C++ function pointer and type cast

http://www.cprogramming.com/tutorial/function-pointers.html

http://www.cplusplus.com/doc/tutorial/typecasting/

https://msdn.microsoft.com/en-us/library/hh279667.aspx

http://www.cplusplus.com/doc/tutorial/pointers/

https://en.wikipedia.org/wiki/Function_pointer

https://www.codeproject.com/Articles/7150/Member-Function-Pointers-and-the-Fastest-Possible

http://www.learncpp.com/cpp-tutorial/78-function-pointers/