I came to know that [expr.compound] mainly applies to built in operators.
But, in terms of syntax and evaluation order, [expr.compound] also applies
to overloaded operators.

Then I read expr.ref#1
<https://timsong-cpp.github.io/cppwp/n4868/expr.compound#expr.ref-1> which
states:

*The postfix expression before the dot or arrow is evaluated;63 the result
> of that evaluation, together with the id-expression, determines the result
> of the entire postfix expression.*
>

As you can see the above quoted statement talks about "evaluation". So my
question is does the above quoted statement from [expr.ref#1] apply to
overloaded operators?