RFR: 8377895: Create sizeof_auto, to reduce narrowing conversions [v2]

[Leo Korinth]

On Mon, 16 Feb 2026 09:32:53 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> I think I understand this feature, a `sizeof` returning the smallest integer type. Can `checked_cast` be used to reduce conversion warning instead?

`checked_cast` has at least three problems:

1) it is checked at runtime, not compile time. 
2) it is checked only on debug builds
3)  you need to use it, it will make the code harder to read, it is easier to use `sizeof_auto`

-------------

PR Comment: https://git.openjdk.org/jdk/pull/29716#issuecomment-3908866088