This part:
«they are guaranteed to traverse elements as they existed upon
construction exactly once, »
establishes what must occur—it establishes the lower-bound of recency of
items reflected.
This part:
«and may (but are not guaranteed to) reflect any modifications
subsequent to construction.»
establishes what may occur—that the upper-bound of recency is not
guaranteed to be the same as the lower bound, but may be higher (more
recent than the lower bound).
If the lower AND upper bound of recency was the exact same, then it
would be indistinguishable from a snapshot of the collection at the time
the iterator was obtained.
On 2026-03-30 15:11, Yagnatinsky, Mark wrote:
Sorry if I’m being dense here but… in that case, what’s the point of
the first part of that sentence?
Is it just saying that the iterator will not present a hopelessly
out-of-date view of the container?
*From:*Viktor Klang <[email protected]>
*Sent:* Monday, March 30, 2026 6:38 AM
*To:* Yagnatinsky, Mark (Associated) <[email protected]>;
[email protected]
*Subject:* Re: [External] : weakly consistent iterators spec seems
misleading?
No, those two statements are different. What bridges the two is: «and
may (but are not guaranteed to) reflect any modifications subsequent
to construction. »» On 2026-03-29 03: 27, Yagnatinsky, Mark wrote:
Hmm… so you’re saying that the most natural
No, those two statements are different.
What bridges the two is: «and may (but are not guaranteed to) reflect
any modifications subsequent to construction.»»
On 2026-03-29 03:27, Yagnatinsky, Mark wrote:
Hmm… so you’re saying that the most natural interpretation of
“[…] guaranteed to traverse elements as they existed *upon
construction* exactly once”
Is roughly
“[…] guaranteed to traverse elements as they existed *upon
construction-or-later* exactly once”
Or not quite?
--
Cheers,
√
Viktor Klang
Software Architect, Java Platform Group
Oracle
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Cheers,
√
Viktor Klang
Software Architect, Java Platform Group
Oracle
