c++ - Difference in definition of member and non member function prototype -

am correct, what

typedef void(classname::*functionname)(); definition of class member function prototype

and

typedef void(*functionname)(); definition of non class or static function prototype

and should used differently:

for class function

pass: registerfunction(&classname::function);

use: (classpointer->*(classpointer->functionpointer))()

for static function

pass: registerfunction(&function);

use: functionpointer();

or misunderstand something?