Re: [RFC][PATCH] rcu: Use typeof(p) instead of typeof(*p) *

On 05/10/2021 20.06, Mathieu Desnoyers wrote:

----- On Oct 5, 2021, at 2:01 PM, Rasmus Villemoes linux@rasmusvillemoes.dk wrote:

quoted

I would think that one could avoid that churn by saying

 typeof((p) + 0)

instead of just "typeof(p)", to force the decay to a pointer.

Also, AFAIU, the compiler wants to know the sizeof(p) in order to evaluate
(p + 0). Steven's goal is to hide the structure declaration, so that would
not work either.

Gah, you're right. I was hoping the frontend would see that +0 could be
optimized away and only affect the type of the expression, but it does
give 'error: invalid use of undefined type ‘struct abc’'. Sorry for the
noise.

Rasmus