[foreign-jextract] [Rev 01] RFR: 8246341: jextract should generate Cpointer utilities class

[Maurizio Cimadamore]

On Tue, 2 Jun 2020 14:55:08 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

>> Added Cpointer utilities class to deal with pointer values from C code.
>
> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last
> revision:
>   * missed EXPORT for 'func'
>   * missed func call and assertion to check callback was reached.
>   * renamed "resize" to "asArray"

Looks a good usability boost. Few observation:

* to me, `resize` is a general property of all accessor helpers. In fact I'd call it more as `asArray` to suggest that it
  just cast the incoming address to a correctly sized address
* I think you can reuse existing template for addresses too - by providing a `VarHandle` constructed with the appropriate
  combinator method.

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PR: https://git.openjdk.java.net/panama-foreign/pull/191