what is this argument?

[rajhansk]

I was reading a source code of a software and came across this line of code.

 static void clear_state_f_static(PluginDef*)

what kind of argument does this function taking?
I am confused because it has asterisk after the name.

[Peter87]

The asterisk means it's a pointer. The function takes a pointer to a PluginDef (whatever that is) as argument.

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

[jonnin]

you can leave the name off args in function defs.

for example
void foo(int); //int x isnt necessary
void foo(int x)
{

}

so at a guess, PluginDef is a type, and this is a header?