[hackyhacky]

> There's no guarantee char8_t is 8 bits either, it's only guaranteed to be at least 8 bits.

Have you read the standard? It says: "The result of sizeof applied to any of the narrow character types is 1." Here, "narrow character types" means char and char8_t. So technically they aren't guaranteed to be 8 bits, but they are guaranteed to be one byte.

[adrian_b]

Yes, but the byte is not guaranteed to be 8 bits, because on many ancient computers it wasn't.

The poster to whom you have replied has read correctly the standard.