Question

As we know, int const and const int are “type synonyms”.

I told somebody earlier that they are equivalent “if that’s the whole type” (i.e. if there are no more tokens in the typename).

But, now that I think about it, is there a pair of types which lexically contain, respectively, int const and const int, which are not equivalent?

Answer 1

No, I don’t think so, unless you add some other qualifiers:

const int x;
volatile const int x;

But:

volatile const int x;
volatile int const x;
const volatile int x;
const int volatile x;
int const volatile x;
int volatile const x;

are all equivalent, though not all equally sensible.