need examples to understand postfix expression grammar

[FabArd]

Hi,

I have trouble understanding these two rules of grammar :

PostfixExpression:
- PostfixExpression ( ArgumentListopt )
- TypeCtorsopt BasicType ( ArgumentListopt )

It seems to me that the first rule corresponds to a function call 
expression.
Is my analysis correct?

As for the second one, I don't understand how to use it.
Can you give me examples of how to use it?